Consider the chemical equation. 2h2 o2 right arrow. 2h2o what is the percent yield of h2o if 87.0 g of h2o is produced by combining 95.0 g of o2 and 11.0 g of h2? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 56.5% 59.0% 88.5% 99.7%

Answers

Answer 1

The percent yield of H₂O, if 87.0 g of H₂O is produced by combining 95.0 g of O₂ and 11.0 g of H₂ is 87.87%.

How do we calculate mass from moles?

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = given or required mass

M = molar mass

Moles of 95g of Oxygen (O₂) = 95g / 32g/mol = 2.96 moles

Moles of 11g of hydrogen (H₂) = 11g / 2g/mol = 5.5 moles

Given chemical reaction is:
2H₂ + O₂ → 2H₂O

From the stoichiometry of the reaction, it is clear that:

1 moles of O₂ = reacts with 2 moles of H₂

2.96 moles of O₂ = reacts with 2×2.96=5.92 moles of H₂

Here hydrogen is the limiting reagent as it has lower moles and formation of water depends on this only.

2 moles of H₂ = produces 2 moles of water

5.5 moles of H₂ = produces 5.5 moles of water

Mass of 5.5 moles of water will be calculated as:

W = (5.5mol)(18g/mol) = 99g

Given theoretical yield of water = 87g

% yield of water will be calculated as:
% yield = (87 / 99)×100 = 87.87%

Hence required value is 87.87%.

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Answer 2

Answer:

D

Explanation:


Related Questions

Do the halogens tend to gain or lose electrons in chemical reactions? how many?

Answers

Explanation:

Halogens tend to gain one electron so that they can get a full outer level and be stable.

Name an element in the third period (row) of the periodic table with a total of 4 3p electrons

Answers

Answer:

sulfur

Explanation:

sulfur has 4p electrons.

phosphorus has 3p electrons.

The question is asking which one has 4

The element in the third period (row) of the periodic table with a total of 4 3p electrons is sulfur (S).

What is sulfur?

Sulfur is a chemical element that is present in the third of the periodic table.

Its atomic number is 16.

The electronic configuration of sulfur is [tex]\rm [Ne]\; 3S_2\; 3P_4[/tex]

So, sulfur contains 4 electrons in its last orbital.

Thus, the element in the third period (row) of the periodic table with a total of 4 3p electrons is sulfur (S).

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Nitrogen is contained in which of the following?
a. adenine.
b. cytosine.
c. guanine.
d. thymine. d. uracil.

Answers

Answer:

DNA contains four nitrogen bases: adenine, thiamine, guanine and cytosine. Adenine and thymine pair, and guanine and cytosine pair.

Explanation:

In combination, nitrogen is found in the rain and soil as ammonia and ammonium salts and in seawater as ammonium (NH4+), nitrite (NO2−), and nitrate (NO3−) ions...

What increases the rate a solute dissolves in a solvent.

Answers

Answer:

Stirring

Explanation:

Stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent. For example, when you add sugar to iced tea and then stir the tea, the sugar will dissolve faster.

Answer:

crushing particles of solute

Explanation:

Al2O3(s)+3CO(g)→2Al(s)+3CO2(g) Express your answer in kilojoules to one decimal place.

Answers

Based on the standard heat of formation of aluminium oxide, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ

What is the heat of reaction?

The heat or enthalpy of a reaction is the amount of heat evolved or absorbed when reactant molecules when reactants form products.

Considering the given reaction:

2 Al2O3(s) -> 2 Al(s) + 3 O2(g)

The heat of formation of aluminum oxide is -1669.8 kJ/mol.

The heat of the reaction of the decomposition of aluminium oxide is calculated as follows:

Heat of reaction = Heat of formation of products - Heat of formation of reactants

Heat of reaction = {3 × ΔHf°O2 (g) + 2 × ΔHf° Al(s)} - 2 × ΔHf° Al2O3 (s)

Since the standard enthalpy of formation,ΔHf°, of an element in its most stable form is equal to zero.

ΔH°rxn = (3 × 0 + 2 × 0) - 2 × -1669.8 kJ/

ΔH°rxn = +3339.6 kJ

Therefore, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ

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A gas mixture contains the following gases with the mole fractions indicated:
water (0.164), hydrogen (0.278), oxygen (0.455), and carbon dioxide (0.101). The
mixture also contains carbon monoxide. What is the mole fraction of carbon
monoxide? PLEASE HELP!

Answers

Hi there!

To find the mole fraction for the remaining compound (Carbon monoxide), we must remember that mole fractions add up to ONE.

We can subtract the mole fractions of all of the other gases from one to solve for the mole fraction of carbon monoxide.

1 - 0.164 - 0.278 - 0.455 - 0.101 = 0.002

Why are flood plains desirable farm land in spite of the fact that they are prone to flooding?.

Answers

Flood plains are desirable farm land in spite of the fact that they are prone to flooding because of its high fertility.

Why are floodplains desirable farm land?

Floodplains are very fertile agricultural areas because the floods carry nutrient-rich silt and sediment and deposited it that plains. Floodplains are flat which make easier farming.

So we can conclude that flood plains are desirable farm land because of its high fertility.

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The periodic table is arranged in order by which classification?.

Answers

Answer:

Atomic weight and valence electrons

Explanation:

These variables allow Mendeleev to place each element in a certain row and column. The table comprises 7 rows and 18 columns.

Which shows that friction is undesirable?
a. Pushing furniture
b. Lighting a matchstick
c. Walking on wet floors
d. Approaching a spotlight

Answers

C. Walking on wet floors shows that Friction is undesirable

correct answer is A
a detailed explaination would be appreciated

Answers

Answer:

yh correct answer is A

Explanation:

the reason is because

What is the percent composition of hydrogen in beryllium hydride, if 69.6g of beryllium with 15.6g of hydrogen to produce 85.2g of BeH2?

Answers

The percent composition of hydrogen is 18.3%.

What is percent composition?

The term percent composition refers to the percentage of a particular component in a compound. It is contained as the ratio of the mass of that component to the total mass multiplied by 100.

From the law of conservation of mass, total  mass of beryllium hydride(BeH2) =  85.2 g

Mass of hydrogen =  15.6 g

Percent composition of hydrogen =  15.6 g/ 85.2 g  × 100/1 = 18.3%

zz. Compound A is crystalline, has a high melting point, and is more conductive when dissolved. Compound B is highly conductive and can be hammered into different shapes. Compound
Cis not highly conductive and is a gas. Which of these compounds is covalent?
compound A
compounds
compound
Nane at these compounds is covalent

Answers

Answer:

Compound C is covalent.

Explanation:

Among the properties of a covalent compound is that it has poor conductivity and could possibly be a gas at room temperature.

Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 1.76 atm to _____ torr.

Answers

i love jesus and i love my mommy

True or false: water is weird. Normally the solid form of a substance is more
dense/compact than the liquid form. When water freezes it forms
crystalline structures that make the molecules spread out causing ice to be
less dense than water and float. This is true of all substances.

Answers

Answer:

this would be true friend :)

Explanation:

for density, it generally goes solids, liquids, then gas in order from most dense, to least dense.

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when the concentration of NADH increases while the concentration of NAD+ decreases, will the electrochemical potential increase, decrease, or remain the same

Answers

When the concentration of NADH increases while the concentration of NAD+ decreases, the electrochemical potential however will increase

What is electrochemical potential?

Electrochemical potential can be defined as a measure of the difference between the average energy of the outermost electrons of the molecule or element in its two valence states.

What is NADP?

NADP is a coenzyme and simply has it full meaning as Nicotinamide Adenine Dinucleotide Phosphate

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In a molecule of water (H2O), two hydrogen atoms are each bonded to one oxygen atom. What forms each of the two bonds?

Answers

the two bonds are formed with the help of covalent bonds

Which units are used for weight? Give the full name, not the abbreviation.

Answers

Answer:

Gram, Kilogram, and Tonne

Explanation:

Answer:

The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about one-sixth as much on the Moon.

Explanation:

Burning fossil fuels creates the ___________ gas carbon dioxide which increases global temperatures.

Question 4 options:

greenhouse


fossil


inert


poisonous

Answers

Greenhouse gas is your answer it is causing the greenhouse effect of trapping heat in the earth

Answer:

green house gas

Explanation:

10 A fixed quantity of gas is placed inside a container of fixed volume at a temperature of
27°C. The gas has a pressure, P.
Which expression shows the pressure of the gas at 57°C?
A P2=(27/57) P
B
P2=(57/27) P
P2=(300/330) P
с
D
P2=(330/300) P

Answers

A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:

C) P2 = (300/330) P

What does Gay-Lussac's law state?

Gay-Lussac's law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas when the volume is kept constant.

Mathematically, it can be written as:

P/T = k

A gas has a pressure P at 27 °C and we want to find the expression to calculate its pressure at 57°C.

Step 1: Convert the temperatures to the Kelvin scale.

We do so by summing 273.15.

K = 27 + 273.15 = 300 K

K = 57 + 273.15 = 330 K

Step 2: Apply Gay-Lussac's law.

P2/330 = P/300

P2 = (300/330) P

A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:

C) P2 = (300/330) P

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Animals burrow into soil is this mechanical weathering or chemical weathering

Answers

Answer:

Animals also contribute to mechanical weathering. Digging animals such as moles break apart rocks underground, while the movement of animals on surface rock can scratch the rock's surface or exert pressure that causes the rock to crack.

Explanation:

pls brainlist me, correct me if I'm wrong

Which of the following is a pure substance?
O A. Milk
O B. Salt
O C. Blood
O D. Candy bar

Answers

Answer:

A. Milk

Explanation:

Cause is basics. It's proved by scientific I watched on TV and my teacher told me. I am a 100% sure.Go ask to your mother how many litres you drink her milk per day.

How to know if a single replacement reaction will occur

Answers

Answer:

To determine whether a given single replacement will occur, you must use an “Activity Series” table. If the metal or the halogen is above the element it will replace based on the activity series, a single displacement reaction will occur. The video below summarizes an experiment conducted to compare the activities of three metals ( Mg, Cu and Zn ).

Explanation:

Single replacement reaction will occur if any more active specie will add on the solution.

What is single displacement reaction?

Single displacement reactions are those reactions in which one element from the given molecule is displaced by some other element.

Generally displacement reactions are shown by metals when more reactive metal is added in the solution of any another metal. Then more reactive metal displaces the metal which is already present in the solution and reaction is taking place is shown by changing in color.

Hence single displacement reaction will occur when more reactive metal is added in any solution.

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When the carbonator adds CO 2 to the solution, a ________ is added to the reaction, which pushes the reaction in the
________ direction.
a. product, forward
b. product, reverse
c. reactant, forward
d. reactant, reverse

(CO2 is added to H2CO3)

Answers

When the product is added to the solution, it will shift the reaction forward.

What is Carbonation?

Carbonation is a form of chemical reaction in which carbon dioxide is added to a solution to give carbonates, bicarbonates, and carbonic acid. In chemistry, the term is used in place of carboxylation to form carboxylic acids

When a product is added to a system, the equilibrium will shift to the left, so as to produce more reactants but if the reactants is remove from the system, equilibrium will also be shifted to the left.

Therefore, When the product is added to the solution, it will shift the reaction forward.

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Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the
formula equation for this reaction?
+

1.F2(1) + Na(s) — NaF2(s)
2.F2(g) + Ca(s) — CaF20)
3 F2(g) + Na(s) — NaF 2(0)
4. F2(g) + Ca(s) __, CaF2(s)


Answers

Answer: B aka #2

Explanation:

The Chemical equation for this reaction is F[tex]_2[/tex](g) + Ca(s) → CaF[tex]_2[/tex]. Therefore, the correct option is option B.

Chemical equations are symbols or chemical formulas that depict a chemical reaction symbolically. With a plus sign separating the entities in the reactants and products, the reactant objects are listed on the left as well as the product objects are listed on the right.

The critical values of a stoichiometric values are shown as coefficients alongside the symbols or formulas of the various entities. Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. The formula equation for this reaction is

F[tex]_2[/tex](g) + Ca(s) → CaF[tex]_2[/tex]

Therefore, the correct option is option B.

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Consider the equation for the formation of water. 2h2 o2 right arrow. 2h2o what is the theoretical yield of h2o if 130 g of h2o is produced from 18 g of h2 and an excess of o2? 18 g 81 g 130 g 160 g

Answers

The theoretical yield is the reaction yield that measures the product of the reaction from the conversion of the limiting reagent. The theoretical yield is 160 gm.

What is mass?

Mass or the theoretical yield is the result of the multiplication of mole and the molar mass of the compound.

The reaction between hydrogen and oxygen is shown as,

[tex]\rm 2H_{2} + O_{2} \rightarrow 2H_{2}O[/tex]

Moles of water is calculated as:

[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{18}{2}\\\\&= 9\;\rm moles\end{aligned}[/tex]

The theoretical yield of water is calculated as:

[tex]\begin{aligned}\rm \text{weight of water} &= \rm moles \times molar \; mass\\\\&= 9 \times 18\\\\&= 162 \;\rm gm\end{aligned}[/tex]

Therefore, option D. 160 gm is the theoretical yield of water.

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The ph of a solution is 2. 0. Which statement is correct? useful formulas include startbracket upper h subscript 3 upper o superscript plus endbracket equals 10 superscript negative p h. , startbracket upper o upper h superscript minus endbracket equals 10 superscript negative p o h. , p h plus p o h equals 14. , and startbracket upper h subscript 3 upper o superscript plus endbracket startbracket upper o upper h superscript minus endbracket equals 10 to the negative 14 power. The poh of the solution is 12. 0. The concentration of oh– ions is 1. 0 mc021-5. Jpg 10–2 m. The concentration of upper h subscript 3 upper o superscript plus. Ions is 100. 0 m. The poh of the solution is 16. 0.

Answers

If the pH of the solution is 2.00. it follows that the pOH of the solution is 12.

What is pH?

The term pH refers to the hydrogen ion concentration of the solution. It shows the degree of acidity in the solution. We also know that the pOH can be obtained from the pH using; pOH = 14-pH.

Hence, if the pH of the solution is 2.00. it follows that the pOH of the solution is 12.

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Zinc reacts with iron (iii) chloride yielding zinc chloride plus iron

Answers

Answer:

I don't see a specific question, so I'll make a few comments and hope that answers the reason for the post.

Explanation:

Zinc(Zn) does react with iron chloride, since zinc is a more reactive metal than the iron.

When Zn is introduced to an iron (III) chloride solution, the Zn disoplaces the Fe atom in a displacement reaction.

The chemical equation of the reaction:

Zn + Fe(III)Cl3 → ZnCl3 + Fe

Energy is often realeased in this type of reaction, since the resulting chemical products have a lower energy that the reactants.

There are several metals more reactive than iron.  One of the more interesting examples of a highly exothermic reaction with iron chloride (rust) is the reaction of aluminum with iron chloride.  `This is highly exothermic and is labelled a thermite reaction.  It provides a spectacular flame that is not enough to weld railroad tracks together.

What is the hydroxide ion concentration of an aqueous solution with a ph of 3. 45

Answers

the solution is an alkali

The hydroxide ion concentration of an aqueous solution with a ph of 3. 45 is  10⁻³·⁴⁵

What is pH?

PH is potential hydrogen. It helps in to determine the acidity and basicity of any solution.

To get the hydroxide ion concentration of an aqueous solution, the following formula will be used.

[tex]pH = -log^[^H^+^]\\pH=-log^[^H^3^O^+^]\\\\-log [^H^3^O^+^] - pH\\ 10 ^-pH = [H3O^+] \\\\H3O^+ = 10^-^3^.^4^5[/tex]

Thus, the hydroxide ion concentration is 10⁻³·⁴⁵

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Write balanced chemical equations for dissociation of the following weak acids and identify their conjugate bases: phosphoric acid (H3PO4), formic acid (HCO2H), and boric acid (H3BO3).

Answers

The conjugate base of an acid is the negative ion that it forms in solution. The conjugate base of each of the following acids are indicated below;

1) H3PO4(aq) ⇄ H^+(aq) + H2PO4^-(aq)(conjugate base)

2) HCO2H(aq)  ⇄ H^+(aq) + HCO2^-(aq) (conjugate base)

3) H3BO3(aq)  ⇄ H^+(aq) + H2BO3^- (aq) (conjugate base)

What is a conjugate base?

When an acid is dissolved in water it is dissociated into ions. The conugate base of the acid is the negative ion that it forms in solution. Let us now see the conjugate base of each of the ions formed;

1) H3PO4(aq) ⇄ H^+(aq) + H2PO4^-(aq)(conjugate base)

2) HCO2H(aq)  ⇄ H^+(aq) + HCO2^-(aq) (conjugate base)

3) H3BO3(aq)  ⇄ H^+(aq) + H2BO3^- (aq) (conjugate base)

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How many more atoms are there in 48g of C compared with 48.6g of Mg? Explain your answer.

Answers

Answer:

The number of carbon atoms is twice the number of magnesium atoms

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