Oxidation of methane to soot:
CH4(g)+O2(g)⟶C(s)+2H2O(g)
Among the hydrocarbons is methane, CH4(g). Only the elements carbon (C) and hydrogen (H) are present in the complex. When methane burns with too much oxygen, it produces water vapor and carbon dioxide gas CO2(g) (g). Complete combustion is defined as combustion with extra oxygen.
Methane can be partially oxidized into a variety of compounds when it is burned inefficiently, including CO, methanol, formic acid, formaldehyde, and higher hydrocarbons.
Carbon monoxide is an extremely toxic gas. It is invisible and odorless. Without anybody being aware of it, malfunctioning gas fireplaces or boilers can poison the air in a room by emitting carbon monoxide.
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The complete question is
Problems that can be caused by both the complete and incomplete
combustion of methane in a gas fire.
(Question) How many atoms are in 3 grams of Cu?
(20 points)
Answer: 2.85 x 10^22
Explanation:
We can use stoichiometry to convert grams to atoms.
*Important quantities*
Original amount of Copper: 3 grams
Molar mass of Copper: 63.5 grams
Avogadro's number: 6.022x10^23 atoms/formula units/molecules
Process - [tex]\frac{3gramCu}{1}[/tex]×[tex]\frac{1 mole Cu}{63.5 gCu}[/tex]×[tex]\frac{6.022x10x^{23} }{1 moleCu}[/tex] = 2.84503937×10^22
After taking sig figs into account, the answer needs to be rounded to 3 decimal places
Final answer: 2.85 x 10^22
Calculate ΔS∘ for Ti(s)+2Cl2(g)→TiCl4(g)
Express your answer using four significant figures.
ΔS∘ for Ti(s)+2Cl2(g)→TiCl4(g) is 659.6J/mol.. It is important to note that, as a general rule, a positive ΔS° indicates an increase in disorder and a negative ΔS° indicates a decrease in disorder.
The change in entropy (ΔS) for a chemical reaction can be calculated using the standard entropies (S°) of the reactants and products.
ΔS° = S°(products) - S°(reactants). For the reaction Ti(s) + 2Cl2(g) → TiCl4(g)S° of Ti(s) = 29.1 J/mol·K, S° of Cl2(g) = 223.1 J/mol·K, S° of TiCl4(g) = 167.4 J/mol·K. Therefore, ΔS° = (S°(TiCl4) + 2S°(Cl2)) - S°(Ti)ΔS° = (167.4 + 2*223.1) - 29.1 = 659.6 J/mol·K. So the ΔS∘ for Ti(s) + 2Cl2(g) → TiCl4(g) is 659.6 J/mol·K with four significant figures. It is important to note that, as a general rule, a positive ΔS° indicates an increase in disorder and a negative ΔS° indicates a decrease in disorder. So in this case, the process of going from solid titanium and gaseous chlorine to gaseous titanium tetrachloride increases disorder, which is consistent with a positive ΔS°.
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Provided below are pictures of three different scnearios in which two different chemicals are mixed together. for each scenario, make a claim about whether or not a chemical reaction is occuring. Provide evidence and reasoning to support your claim. If a reaction cannot be determined based on the provided picture, explain why not and how you could determine if a reaction has occured. Use specific examples in your explanation.
Looking at the images that we have, we can see that there is a reaction in the images A and C.
What is a reaction?We would need to settle in our minds what is implied when we talk about a chemical reaction. You have to know that if we are talking about a chemical reaction then we are talking about the kiondfs of reaction that would lead to the following observations;
1) There is a change in the temperature of the system
2) There is an effervescence of gas in the system
3) There is a change in color
4) There is the appearance of a solid in the system
We would now have to look at all the setups that we have here and we have to look at it in such a way that we could know if there is a reaction that is going on in any of them as shown.
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The broad bands or regions located around the nucleus where the electrons are found are called energy rings.
True
False
It is false that the broad bands or regions located around the nucleus where the electrons are found are called energy rings.
The nucleus is the centre of an atom. Protons and neutrons are particles that make up the nucleus. Shells of electrons rotate around the nucleus. The atom is made up of a small nucleus surrounded by electrons that move. The nucleus includes protons, with a positive charge equivalent to the negative charge of an electron. Neutrons, which have almost the same mass but still no charge as protons, may also be found in the nucleus.
The nuclear powerful force extends long enough from each baryon to bind protons and neutrons together while repelling the repelling electrical force between positively charged protons. The nuclear force acting has a relatively narrow range and practically vanishes just beyond the nucleus's border.
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calculate the solubility of AgCN in a solution containing 1.0M H Ksp of AgCN is 2.2e-12 Ka of HCN is 6.2e-10
The solubility of AgCN in a solution containing 1.0M H Ksp of AgCN is 2.2e-12 Ka of HCN is 6.2e-10 is 5.9 x 10^-2M.
Given concentration of H+ (M) = 1.0M
Ksp of AgCN = 2.2e-12
Ka of HCN = 6.2e-10
AgCN ⇋ Ag+ +CN− ................Ksp
CN − + H+ ⇋ HCN................... 1/Ka
AgCN + H+ ⇋ HCN + Ag+ ...................Ksp/Ka = K0
K0 = 2.2e-12/6.2e-10 = 0.0035 = 35 x 10-4
At Equilibrium: AgCN + H+ ⇋ HCN + Ag+
Let the moles of [Ag+] = x
So the number of moles of [HCN] = x
K0 = [Ag+] [HCN] / [H+]
35 x 10-4 = x^2/1
x = 5.9 x 10^-2M
Hence the molar solubility of AgCN in buffer solution is 5.9 x 10^-2M.
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Why do the electrons stay in between the nuclei of the two hydrogen atoms chemthink
Electrons stay in between the nuclei of the two hydrogen atoms because they are attracted to the positive charge of the nuclei.
Electrons are negatively charged species, so they are attracted towards the positive charge of a nucleus.
In hydrogen atom, when both the two hydrogen atoms get close to each other then the electrons of each atom will get attracted to both the nuclei. And if both the hydrogen atoms come close to each other they will repel each other.
The energy of the two hydrogen atoms becomes less when they are together than when they are far apart.
Thus, the electrons tend to stay in between the nuclei of the two hydrogen atoms.
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A 16. 81 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 21. 33 grams of CO2 and 5. 822 grams of H2O are produced. In a separate experiment, the molar mass is found to be 104. 1 g/mol. Determine the empirical formula and the molecular formula of the organic compound
A 16. 81 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 21. 33 grams of CO₂ and 5. 822 grams of H₂O are produced. In a separate experiment, the molar mass is found to be 104. 1 g/mol. The empirical formula is CH₃ and molecular formula is C₇H₇O₂₁
The empirical formula can be calculate as follows:
The reaction can be write
CxHyOz → CO₂ + H₂O
As a result, we may state that there are two O-atoms for every one C-atom (12g) in CO2 (32g).
This indicates that the ratio is 12g C/32g O.
The molar mass of CO₂ is 44 g/mole.
(12/44) x 33 = 9 g
There are 9 grams of carbon in every 33 grams of CO₂
The same can be done for water:
In H₂O, each element is represented by two H atoms and one O atom. 2 g H and 16 g O.
[2 g H / 18 g H2O] are present in 5. 822 g of water
(2/18)x 5.822= 0.6468 g
The initial sample had 14.16 g of sample, 9 g of C, and 0.6468 g of H, which resulted in 34.3532g of oxygen.
Determine the amount of moles.
C: 9.0 g / 12.0 g/mol = 0.75 mol
H: 0.6468 g / 1.0 g/mol = 0.6468 mol
O: 34.3532g / 16.0 g/mol = 2.14 mol
Then we divide by the smallest number
C: 0.75 mol / 0.6468 mol = 1
H: 0.6468 mol / 0.6468 mol= 1
O: 2.14 mol/ 0.6468 mol = 3
so the empirical formula will be CH₃
Determine the molecular formula
mass molecular formula / mass of empirical formula = n
We have to multiply the empirical formula by n to get the molecular formula.
104.1 /15 = 7= n
This means the molecular formula = C₇H₇O₂₁
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What does the World Skin Cancer Map tell you about how the skin cancer rates of Australia and Brazil differ?
The World Skin Cancer Map shows that Australia has much higher skin cancer rates than Brazil. In Australia, an estimated 5.4 out of 100 people will develop melanoma in their lifetime, compared to 0.4 out of 100 in Brazil.
What is Skin Cancer?Skin cancer is a type of cancer that affects the skin cells. It is caused by over-exposure to ultraviolet (UV) radiation from the sun and sun beds. It is the most common type of cancer in the United States, and can affect anyone, regardless of age, gender, or skin color. It is very important to protect your skin from the sun by using sunscreen.
Australia also has higher rates of non-melanoma skin cancer, with estimated rates of 24.3 out of 100 people in Australia, compared to 5.3 out of 100 people in Brazil.
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Which of the following elements will form positive ions Na N Cu Br
Answer:
Na, Cu, and Br will form positive ions
Explanation:
Na, Cu, and Br have more protons than electrons, so they will form positive ions.
Na, Cu, and Br are all elements that have an atomic number greater than their number of electrons. This means that they have more protons than electrons, so they will form positive ions when they react with other elements. Na will form Na+, Cu will form Cu+ and Br will form Br+.
What is Ghez’s favorite star? Do you have a favorite star? Why or why not?
Andrea Ghez's favorite star is known as SO-2 and it is her favorite star because this star goes around the universe in a short period. I do not have a favorite star because I do not know a lot about stars.
Who is Andrea Ghez?Andrea Ghez is female astrophysicst who was born in the United States known for being one of the few women in the world who have gotten the Nobel Prize in Physics. During her life, Andrea has studied the center of the universe, black holes and the stars. Moreover, she was known for giving a TED talk in whiich she explained about stars and black holes.
What is Andrea's favorite start?In the TED talk given by Andrea Ghez she mentions her favorite star is the SO-2 as "it goes around in only 15 years".
What is my favorite star?I do not have a favorite star because I do not know a lot about stars, although I believe studying them is very interesting.
Note: This question is incomplete; here is the missin information:
TED Talk- Andrea Ghez
"Now, most astronomers have a favorite star, and mine today is a star that's labeled up there, SO-2. Absolutely my favorite star in the world. And that's because it goes around in only 15 years. And to give you a sense of how short that is, the sun takes 200 million years to go around the center of the galaxy"
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How many moles are in 50 grams?
3.125 moles of oxygen are present in 50 g.
A mole is the volume of a substance that contains 6.022 X 1023 of the substance's particles, atoms, ions, molecules, etc. A mole is a unit for counting molecules, ions, or atoms. Divide the given mass of an element by its molar mass to find the number of moles in that quantity.
The atomic weight of an element, or its relative atomic mass, on the periodic table, expressed in g/mol, is its molecular mass.
The molar mass of oxygen is 16 g/mol, and there are 3.125 moles in a given amount of mass and molar mass.
Consequently, 3.125 moles of oxygen are present in 50 g.
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Suppose that 20 mL of 2.50 x 10^-2 M aqueous H 2 SO 4 is required to neutralize 10.0 mL of an aqueous solution of KOH. What is the molarity of the KOH solution
The molarity of KOH solution will be 0.75 M.
The amount of moles of solute per liter of solution is known as molarity (M). Molarity is defined as moles of solute per liter of solution. To ascertain the concentration of an identified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A standard solution with a known concentration and volume is prepared as the reagent, also known as the titrant or titrator.
The balanced equation is
[tex]H_{2} SO_{4}[/tex]+ 2KOH = [tex]2H_{2} O[/tex]+ [tex]K_{2} SO_{4}[/tex]
2.50 x [tex]10^{-2}[/tex] M= [tex]\frac{x}{0.2 L}[/tex]
So, 0.75 M KOH.
So, The molarity of KOH solution will be 0.75 M.
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How many ATP are directly generated in the Krebs cycle when 2 molecules of glucose are oxidized?
4 ATP molecules are directly generated in the Krebs cycle when 2 molecules of glucose are oxidized
How Krebs cycle move to produce glucose molecule?The Krebs cycle, TCA cycle or the citric acid cycle, is a series of enzyme-catalyzed reactions occurring in the mitochondrial matrix and involves the oxidation of acetyl-CoA.
The acetyl group of acetyl-CoA is oxidized to make two molecules of CO2 in a succession of eight steps, while also producing one ATP. Additionally, reduced high-energy molecules like NADH and FADH2 are created.
Each glucose molecule produces two acetyl-CoA molecules, the Krebs cycle must move twice for one glucose molecule to produce the four CO2, six NADH, two FADH2, and two ATPs.
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a reaction such as A+B -> products that exhibits second-order kinetics can be studied using a large excess of one reactant. Under these conditions, the concentration of the reactant in excess will not change much during the reaction, which will exhibit _________-first-order kinetics.
a reaction such as A+B -> products that exhibits second-order kinetics can be studied using a large excess of one reactant. Under these conditions, the concentration of the reactant in excess will not change much during the reaction, which will exhibit pseudo-first-order kinetics.
A fraud or imposter is defined as something or someone that is false but attempts to pass for the real deal. Although it's typically a prefix, pseudo can refer to a faker. A pseudo-intellectual, for instance, will attempt to persuade you that he has a brilliant mind despite the fact that he does not. The fame of a pseudo-celebrity is minimal. A combining form with the meaning "false," "pretended," or "unreal," used in the creation of compound words (pseudo classic; pseudointellectual); in science, designating a close or deceptive resemblance to the following element (pseudobulb; pseudocarp); and occasionally used in the chemical names of isomers (pseudoephedrine). a person who professes to be skilled in academic or creative endeavours but lacks in-depth comprehension or critical thinking. a person who exaggerates their intelligence and engages in intelligence fraud.
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The normal boiling point for acetone is 56.5°C. At an elevation of 5300 ft the atmospheric pressure is 630. torr. What would be the boiling point of acetone (ΔHvap 32.0 kJ/mol) at this elevation? What would be the vapor pressure of acetone at 22.0°C at this elevation?
The normal boiling point for acetone is 56.5°C. At an elevation of 5300 ft the atmospheric pressure is 630. torr. The vapor pressure of acetone at 22.0°C at this elevation is 212.22 torr.
What is vapor pressure ?The equilibrium pressure of a vapour above its liquid (or solid), or the pressure of the vapour produced by the evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container, is the vapour pressure of a liquid. Substance; vapour pressure at 25 °C, as examples.
In Step 1:
The normal boiling point for acetone = 56.5°C.
At an elevation of 5300 ft the atmospheric pressure = 630 torr
ΔHvap = 32.0 kJ/mol
The temperature is 24.0 °C
In Step 2:
ln(p1/p2) = (∆ H/R) (1/T2 - 1/T1)
Normal atmospheric pressure
= 1 atm
= 760 torr
So, (760/630) = ((32.000 J/mol) / (8.314 J/K*mol)) (1/T2 - 1/329.65 K).
T2 = 324.4 K = 51.25 °C.
This is the boiling point of acetone at 5300 ft.
The vapor pressure = atmospheric pressure at the boiling point for any liquid.
ln (Pv/630atm) = ((32.000 J/mol) / (8.314 J/K*mol)) (1/324.4 K - 1/297.15)
ln (Pv/630) = -13615388.3
Pv = 212.22 torr
Thus, The vapor pressure of acetone at 22.0°C at this elevation is 212.22 torr.
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Your lab group accidentally leaves a beaker of 1.00 \space M1.00 M \ce{NaOH}NaOH solution out on the lab table overnight and its volume is decreased to one third the original from evaporation, what is the new molarity
One of the lab groups unintentionally left a beaker with 1.00 M1.00 M of NaOH solution out on the lab table over night. The molarity of the solution is 3.00 M after evaporation.
The total moles of solute contained in a given volume of solution is referred to as a solution's molarity. In this case, "M" stands for molarity, "n" is the number of moles of solute present in the solution, and "V" is the volume of solution present in a container. A unique kind of homogenous mixture made up of two or more components is known as a solution in chemistry. A solute, or substance that is dissolved in a solvent, is one of the components of such a mixture.
Moles = 1.00/1/3 Moles = 3.00 M
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A mixture contains only NaCl and Al2(SO4)3. A 1.68-g sample of the mixture is dissolved in water and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.116 g. What is the mass percent of Al2(SO4)3 in the sample
The precipitate is collected, filtered, dried, and weighed.. The mass of the precipitate is 0.116 g.
What is dissolved?Dissolved refers to a solute that is completely dissolved in a solvent, resulting in a homogeneous mixture. When a solute, such as a salt, is dissolved in a solvent, such as water, the molecules of each component are dispersed evenly throughout the mixture. This process can be reversed by evaporating the solvent, leaving the solute behind. The amount of solute that can be dissolved in a particular solvent is known as its solubility.
Mass of Al2(SO4)3= Mass of sample- Mass of precipitate
Mass of Al2(SO4)3= 1.68-0.116=1.564 g
Percent of Al2(SO4)3= (1.564/1.68)*100= 93.45 %
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A polymer has a relative molecular mass of 112000.Calculatethe number of monomers{C=12, H=1}
name a solid that when burnt colourless gases are formed.One gas is strongly acidic while the other is slightly basic
Sulfur is a solid that when burnt produces two colourless gases: sulfur dioxide (SO2) and sulfur trioxide (SO3). The gas SO2 is strongly acidic, while the gas SO3 is slightly basic. When SO3 is dissolved in water, it forms a solution called sulfuric acid, which is a strong acid. SO2 is also a corrosive gas that can be harmful to humans and the environment. It is often produced as a byproduct of industrial processes, such as the burning of fossil fuels and the production of sulfuric acid.
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What are true about water changing states?
Answer:
The last one is true.
Why are the elements in Groups 1 and 17 so reactive?
Fluorine as well as chlorine are among the substances in group 17. Alkali metals as well as hydrogen are both part of group 1 on the periodic table.
Group 1 elements were extremely reactive due to the fact that they only contain one valence electron. As just a result, atoms were only ever combined with some other elements present in nature.
Due to their size as well as low ionisation enthalpy, alkali metals were extremely reactive metals. Moving lower in the group causes them to become more reactive. Reactivity to air: These metals discolor when exposed to dry air because oxides create, which then react with moisture to generate hydroxides.
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Read the labels of several commercial products and identify monatomic ions of at least four transition elements contained in the products. Write the complete electron configurations of these cations
As stated in the preceding statement [Zn²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰, [Fe3+] = 1s²2s²2p⁶3s²3p⁶3d⁵, [Fe²⁺] = 1s²2s²2p⁶3s²3p⁶3d⁶, [Cd²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰
What is the straightforward meaning of element?Denotes to a basic material that isn't divided into smaller components or transformed into another chemical in chemistry. An atom, which is made up of protons, neutrons, and particles, is really the fundamental unit of an element. An element's atoms all equal the number of protons.
Dietary supplements include Zn²⁺ ions:
[Zn²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰
Mineral water contains Fe³⁺ cations:
[Fe3+] = 1s²2s²2p⁶3s²3p⁶3d⁵
Food supplements may include Fe²⁺ cations:
[Fe²⁺] = 1s²2s²2p⁶3s²3p⁶3d⁶
Paints had Cd²⁺ ions in them:
[Cd²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰
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The complete question is-
Read the labels of several commercial products and identify monatomic ions of at least four transition elements contained in the products. Write the complete electron configuration of these cations. Make sure to clearly identify which monatomic ions is found in which commercial product.
Oil of vitriol is a substance that humankind has known of for thousands of years! Today the substance is known by it's scientific name sulfuric acid and has the molecular formula H2SO4. What is the molar mass of H2SO4
The molar mass of H2SO4 is 98.08 g/mol. It is a combination of hydrogen with molecular weight of 1g, sulfur with 32g and oxygen with 16g and the total combination is 2x1+1x32+4x16 = 98g.
Humanity has been aware of oil of vitriol for thousands of years. The chemical name for this material is sulfuric acid, and its molecular formula is H2SO4. It is made up of sulfur, oxygen, and hydrogen molecules. Strong and hygroscopic sulfuric acid (H2SO4) has oxidizing and hygroscopic characteristics. Because it was made by roasting "green vitriol" (iron(II) sulfate) in an iron retort, sulfuric acid was known as "oil of vitriol" by medieval European alchemists. Due to its oily appearance and occurrence in vitreous or glassy substances like ferrous sulphate and alum, it is also known as the "oil of vitriol."
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which of the following molecules has the most polar bond between the bonded atoms in terms of greatest and hf hcl hbr hl
HCl is the most polar due to the high electronegativity of Cl.
Hydrogen chloride is a diatomic molecule, composed of a hydrogen atom, H, and a chlorine atom, Cl, joined by a polar covalent bond. The bond is a polar covalent bond because the chlorine atom is much more electronegative than the hydrogen atom.
Positively charged protons in the nucleus attract negatively charged electrons. As the number of protons in the nucleus increases, the electronegativity, or attractive force, increases. Therefore, electronegativity increases in a row from left to right on the periodic table.
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Methanol (methyl alcohol or wood alcohol) is a potential automotive fuel, either in pure form or mixed with gasoline. Some fleet vehicles, such as municipal buses, have been modified to burn methanol-containing fuels. These fuels are also used by some race cars. A particular automobile modified to use a mixture of 85.0% methanol and 15.0% gasoline by mass gets 25.5 mi/gal. The fuel has a density of 0.775 g/mL. How many kilograms of methanol does the automobile consume in a trip of 808 km
Answer:
it’s 4
Explanation:
Draw the product (s) formed by heating the following compounds in basic ethanol.
EtOH
NaOEt
the product (s) formed by heating the following compounds in basic ethanol: EtOH and NaOEt is shown in the image.The reaction product is simpler because it is determined by the condition of the reagent and the catalyst or solvent.
there are many factors that determine the product as given. When alcoholic beverages (beer, wine, and spirits) are diluted, ethanol is present. It is used topically to prevent skin infections, in pharmaceutical preparations (such as rubbing compounds, lotions, tonics, and colognes), cosmetics, and perfumes. Ethanol, also referred to as ethyl alcohol, is a colourless, flammable liquid with a strong odour. It is the alcohol found in alcoholic beverages and employed as a solvent that is generated by fermentation. Alcohols are organic molecules made up of carbon, oxygen, and hydrogen atoms. When two carbons are present, the alcohol is referred to as ethanol (also known as ethyl alcohol).
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S3o5 chemical compound
Answer:
Stainless SteelExplanation:
Stainless Steel Stainless Steel Stainless Steel Stainless Steel Stainless Steel Stainless SteelAnswer:
Sulfure 3
Oxygen 5
Explanation:
The S stands for Sulfure. And the stands for Oxygen. If you meant the name then its Trisulfur Pentoxide
hopefully that's what you meant.
How many moles are in 4.0 x 10^24 atoms of silicon?
Atoms of silicon have 0.15 moles.
[tex]4.0 × 10^2^4[/tex] atoms of silicon.
We have to find the number of moles.
Silicon has the atomic number 14.
One mole of silicon contains [tex]6.023× 10^2^3[/tex] atoms.
[tex]6.023× 10^2^3[/tex]number of atoms are present in one mole of silicon.
[tex]4.0*10^24[/tex]number of atoms will have-
[tex]6.023*10^2^3/4.0*10^2^4=0.15[/tex] moles.
Thus atoms of silicon have 0.15 moles.
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Has 13 protons and 14 neutrons what is its mass number?
An atom that has 13 protons and 14 neutrons will have mass number 27.
Rutherford demonstrated that an atom's nucleus, which is made up of protons and neutrons, contains the vast bulk of the atom's mass. The total number of protons and neutrons in an atom is referred to as the mass number. The number of protons(atomic number) and neutrons and their sum can be used to compute it.
We know that,
Mass number = Number of protons + Number of neutrons
= 13 + 14 = 27.
The mass number is 27.
Therefore an atom that have 13 protons and 14 neutrons will have mass number 27.
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What numbers do I put on the right side?
The leftovers of [tex]C_2H_2[/tex] will be 6 moles while the leftover of [tex]O_2[/tex] will be zero.
Mole ratio of reactantsIn the originally balanced equation of the reaction, 2 moles of [tex]C_2H_2[/tex] and 5 moles of [tex]O_2[/tex] react completely to produce 4 moles of [tex]CO_2[/tex] and 2 moles of [tex]H_2O[/tex]. This equation is balanced with no reactant left.
Now, 8 moles of [tex]C_2H_2[/tex] were made to react with 5 moles of [tex]O_2[/tex] in the second reaction. The mole ratio of the two reactants for complete reactions is 2:5. Thus, [tex]C_2H_2[/tex] has been supplied in excess.
Since only 5 moles of [tex]O_2[/tex] is available, only 2 moles of [tex]C_2H_2[/tex] will be consumed. Thus, 6 moles of [tex]C_2H_2[/tex] will be left while the oxygen will be completely consumed. That is, the amount of [tex]O_2[/tex] left would be zero.
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