Answer: [tex]\Delta H^{0} = -879.15 kJ/mol[/tex]
Explanation: Heats of formation is the amount of heat necessary to create 1 mol of a compound from its molecular constituents. The basic conditions the substance is formed is at standard conditions: 1 atm and 25°C. Each compound has its own heat of formation per mol of compound (kJ/mol), but to an element is assigned a value of zero.
Standard Enthalpy Change is defined as the heat absorbed or released when a reaction takes place. It can be positive or negative, which means reaction is endothermic or exothermic, respectively.
Enthalpy change is calculated as the difference between the sum of heat formation of products and the sum of heat formation of the reactants:
[tex]\Delta H^{0}=\Sigma H^{0}_{f}_{(products)}-\Sigma H^{0}_{f}_{(reactants)}[/tex]
For the reaction
2NH₃ + 3N₂O → 4N₂ + 3H₂O
2(-46.2) + 3(82.05) 4(0) + 3(-241.8)
[tex]\Delta H^{0}=3(-241.8)-[ 2(-46.2)+3(82.05)][/tex]
[tex]\Delta H^{0}=-725.4-153.75[/tex]
[tex]\Delta H^{0}=-879.15[/tex]
The standard enthalpy change for the reaction is [tex]\Delta H^{0}=-879.15[/tex] kJ
Please help if you know please and thanks ;)
Answer:
it takes two hydrogen atoms for every oxygen atom to produce this reaction, so the mole ratio between hydrogen and oxygen is 2:1
12. What is the volume of 0.07 mol of neon gas at STP?
2 L Ne
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KExplanation:Step 1: Define
0.07 mol Ne (g)
Step 2: Identify Conversions
STP - 22.4 L per mole
Step 3: Convert
Set up: [tex]\displaystyle 0.07 \ mol \ Ne(\frac{22.4 \ L \ Ne}{1 \ mol \ Ne})[/tex]Multiply: [tex]\displaystyle 1.568 \ L \ Ne[/tex]Step 4: Check
Follow sig fig rules and round. We are given 1 sig fig.
1.568 L Ne ≈ 2 L Ne
Under certain conditions, the substance ammonium chloride can be broken down to form ammonia and hydrogen chloride. If 29.4 grams of ammonium chloride react to form 9.4 grams of ammonia, how many grams of hydrogen chloride must simultaneously be formed
Answer: 20.0 g of hydrogen chloride must simultaneously be formed
Explanation:
The balanced chemical reaction is :
[tex]NH_4Cl\rightarrow NH_3+HCl[/tex]
According to the law of conservation of mass, mass can neither be created nor be destroyed. The mass on reactant side must be equal to the mass on product side.
Thus mass of reactants = mass of products
Given : mass of ammonium chloride = mass of reactants = 29.4 g
mass of ammonia = 9.4 g
mass of products = mass of ammonia + mass of hydrogen chloride
9.4 g +mass of hydrogen chloride = 29.4 g
mass of hydrogen chloride = 20.0 g
The type of elements found in groups 13-18 include
Answer:
Please put question in!
Explanation:
PLZZZ help asaap plz its 50 points plzzzz Calculate for the formula mass (for ionic compounds) and molecular mass (for covalent compounds):
Mg3 (AlO3)2
(NH4)2 C2O4
Al 4 ( Fe (CN)6)3
hope it helps
mark me brainliest
What would be the mass of 9.03 x 1021 molecules of hydrobromic acid?
Answer:
[tex]1.214\ g[/tex]
Explanation:
[tex]We\ know\ that,\\No.\ of\ molecules\ of\ Hydrobromic\ acid=9.03*10^{21} HBr\ molecules\\Now,\\We\ know\ that\ Hydrobromic\ acid\ is\ constituted\ by\ 1\ Hydrogen\ molecule\\ and\ 1\ Bromine\ molecule.\\Gram\ Atomic\ Mass\ of\ Bromine \approx 80\ g\\Gram\ Atomic\ Mass\ of\ Hydrogen =1\ g\\Hence,\\The\ Gram\ Molecular\ Mass\ Of\ Hydrobromic\ Acid=1*1+1*80=81\ g\\Avagadro's\ Constant=6.022*10^{23}\ particles[/tex]
[tex]Now,\\We\ know\ that,\\Mass=\frac{No.\ of\ particles}{Avagadro's\ Constant}*GMM\\Here,\\Mass\ of\ 9.03*10^{21} molecules\ of\ HBr= \frac{9.03*10^{21}}{6.022*10^{23}}*81 \approx 1.214\ g[/tex]
Consider 55 mL of water (H2O) in a beaker and 55 mL of acetone [(CH3)2CO] in an identical beaker under identical conditions. Complete the sentences to explain the relationship between the vapor pressure of water and acetone.
Answer:
More slowly than
Larger than
Weaker
Explanation:
The vapor pressure of a solution describes how quickly a solution will turn into vapour. If we say that a solution has a high vapour pressure, we are actually saying that the solution turns into vapour more quickly.
Acetone has a higher vapour pressure than water so acetone turns to vapour quicker than water.
Vapour pressure has a lot to do with the magnitude of intermolecular forces in solution. The stronger the magnitude of intermolecular forces, the lower the vapor pressure and the more slowly the solution evapourates.
So, the hydrogen bonds in water provides stronger intermolecular forces than dispersion and dipole interaction in acetone. Hence, water vaporizes more slowly than acetone.
20g of water at 30°C was mixed with 40g of water at 75°C. What is
the final temperature of the mixture? (specific heat capacity of water
is 4.184 J/g°C).
Answer:
The temperature of the mixture is 60°C
Explanation:
We can write the energy of water as follows:
E = m×C×T
Where E is energy in Joules, m is mass of water, C is specific heat of water = 4.184J/g°C and T is temperature
Replacing fot both samples:
E = 20g×4.184J/g°C×30°C
E = 2510.4J
E = 40g×4.184J/g°C×75°C
E = 12552J
The total energy of the mixture is 12552J + 2510.4J = 15062.4J
Mass = 60g:
15062.4J = 60g×4.184J/g°C×T
60°C = T
The temperature of the mixture is 60°Calkenes a. none of the above b. are relatively polar compounds c. are reasonably soluble in water d. have lower boiling points than alcohols of similar molecular weight
Answer:
have lower boiling points than alcohols of similar molecular weights.
Explanation:
Alkenes are hydrocarbons of the general molecular formula CnH2n. Alkenes are nonpolar hydrocarbons that are insoluble in water.
We must recall that alcohols are able to associate in water due to hydrogen bonding. This causes alcohols to have a relatively higher boiling point than alkenes of comparable molecular weight. Hencethe answer above.
Consider a 75.0-g sample of H2O(g) at 1258C. What phase or phases are present when 215 kJ of energy is removed from this sample
Answer:
Explanation:
The first process is to draw out the heating curve to have a look at the transition possible which we've shown in the file below.
Now;
To find the energy removed to convert 75g steam → ice then comparing it with 215 kJ.
So conversion of steam at 125 °C → 100 °C
[tex]\Delta H = (75 \ g) (2.0 \ J/g^0C ) (125 - 100)^0 \ C[/tex]
[tex]\Delta H = 3750 \ J[/tex]
[tex]\Delta H = 3.75 \ kJ[/tex]
Since this is lesser than the energy given (215 kJ), we then have to find the energy removed in the next phase.
For condensation of steam
Find the energy removed to change the steam from 100° C to liquid at 100° C
[tex]\Delta H_2 = ( \dfrac{75 \ g}{18.02 \ g/mol}) (40.7 \ kJ/mol)[/tex]
[tex]\Delta H_2 =1.690* 10^ 2 \ J[/tex]
[tex]\Delta H_2 =169 \ kJ[/tex]
The total energy that is now removed from the system is:
[tex]\Delta H_1+ \Delta H_2 = (169 + 3.75) \ kJ[/tex]
[tex]\Delta H_1+ \Delta H_2 \simeq 173 \ kJ[/tex] which is still lesser than 215 kJ
To the third step; which is the conversion of water at 100° C → water at 0° C
[tex]\Delta H_3 = ( 75 \ g) (4.2 \ J/g^0 C)(100-0)^0C[/tex]
[tex]\Delta H_3 = 31500 \ J[/tex]
[tex]\Delta H_3 = 31.5 \ kJ[/tex]
Thus;
[tex]\Delta H_1+\Delta H_2+\Delta H_3 = (169 + 3.75 +31.5) \ kJ[/tex]
[tex]\Delta H_1+\Delta H_2+\Delta H_3 =204 \ kJ[/tex]
To the fourth step;
For freezing of water; we need to find the energy removed to change the water at 0° C → ice at 0° C
[tex]\Delta H_4 = (\dfrac{75 \ g}{18.02 \ g/mol})(6.02 \ kJ/mol)[/tex]
[tex]\Delta H_4 = 25.1 \ kJ[/tex]
∴
To change to the solid phase at 0° C; the total energy that is being removed from the steam is
[tex]\Delta H_1+\Delta H_2+\Delta H_3 +\Delta H_4 =(169 + 3.75 + 31.5 +25.1) \ kJ[/tex]
[tex]\Delta H_1+\Delta H_2+\Delta H_3 +\Delta H_4 =229 \ kJ[/tex]
Here, the calculated total energy is more than the given energy 215 kJ.
This implies that the water is not fully converted to ice when 215 kJ of energy removal occurs, Hence the two phases that exist are liquid and solid.
Many children are uncomfortable around white lab coats. Specifically explain why this occurs in what a doctor or dentist could do to counteract this reaction and still wear a white lab coat
Answer:
Sanitize
Explanation:
Humans have developed ways to increase the carrying capacity of their environment. True or false
Answer:
false.nowadays humans are destroying forest,extracted more minerals,making pollution. in my view.
Calculate the molarity of a solution prepared by dissolving 15.0 moles of solute in enough solvent to 50.0 liters of solution.
Answer:
Molarity of a solution = 0.3 mol/liter
Explanation:
Given:
Moles of solute = 15 moles
Amount of solution = 50 liters
Find:
Molarity of a solution
Computation:
Molarity of a solution = Moles of solute / Amount of solution
Molarity of a solution = 15 / 50
Molarity of a solution = 0.3 mol/liter
Calculate the mass, in grams, of 1.2000 mol Mg₃N₂
If silicon has a charge of +4 and oxygen has a charge of -2, what is the total charge on this structure?
Answer:
Zero with the subscripts, +2 without them.
Explanation:
Hello!
In this case, since we consider that two silicon are bonded with four oxygen atoms to form silicon oxide according to the following chemical equation:
[tex]Si^{4+}+O^{2-}\rightarrow Si_2O_4[/tex]
It is also possible to realize it can be simplified to obtain:
[tex]SiO_2[/tex]
Which means that the total charge with the subscripts is zero, and without the subscripts +2 (+4-2).
Best regards!
You are given 100 mL of of a KOH solution with pH of 12.0. You are required to change the pH to 11.0 by adding water. How much water will you add
Answer:
We need to add 900 mL of water.
Explanation:
To know the amount of water to add first we need to calculate the concentration of KOH when the pH is 12 and when is 11:
[tex] 14 = pH + pOH [/tex]
[tex] pOH = -log[OH] [/tex]
[tex] OH = 10^{-pOH} [/tex]
When pH = 12 (initial):
[tex]pOH_{i} = 14 - 12 = 2[/tex]
[tex]OH_{i} = 10^{-2}=0.01 M[/tex]
When pH = 11 (final):
[tex]pOH_{f} = 14 - 11 = 3[/tex]
[tex]OH_{f} = 10^{-3} = 0.001 M[/tex]
Now, by using the following equation we can find the volume of the solution to achieve a pH = 11:
[tex]C_{i}V_{i} = C_{f}V_{f}[/tex]
[tex]V_{f} = \frac{C_{i}V_{i}}{C_{f}} = \frac{0.01 M*100 mL}{0.001 M} = 1000 mL[/tex]
Finally, to bring 100 mL of the initial solution to 1000 mL we need to add the following amount of water:
[tex]1000 mL = V_{KOH} + V_{H_{2}O}[/tex]
[tex] V_{H_{2}O} = 1000 mL - V_{KOH} [/tex]
[tex] V_{H_{2}O} = 1000 mL - 100 mL = 900 mL [/tex]
Therefore, we need to add 900 mL of water.
I hope it helps you!
The amount of water that needs to be added will be 900 mL
What will be the amount of water needed?For finding the amount of water added we have to calculate the concentration of KOH at pH=12 and pH=11
[tex]14=pH+_pOH[/tex]
[tex]_pOH=-Log[OH][/tex]
[tex]OH=10^{-_pOH}[/tex]
[tex]_pOH_f=14-11=3[/tex]
When pH = 12 (initial):
[tex]_pOH_i=14-12=2[/tex]
[tex]_pOH_i=10^{-2}=0.01[/tex]
When pH = 11 (final):
[tex]_pOH_i=10^{-2}=0.01[/tex]
[tex]_pOH_f=14-11=3[/tex]
Now, by using the following equation we can find the volume of the solution to achieve a pH = 11:
[tex]C_iV_i=C_fV_f[/tex]
[tex]V_f=\dfrac{C_iV_I}{C_f} =\dfrac{0.01\times100}{0.001} =1000\ mL[/tex]
Finally, to bring 100 mL of the initial solution to 1000 mL we need to add the following amount of water:
[tex]1000=V_{KOH}+V_{H_2O}[/tex]
[tex]V_{H_2O}=1000mL-V_{KOH}[/tex]
[tex]V_{H_2O}=1000-100=900mL[/tex]
Thus the amount of water that needs to be added will be 900 mL
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Investigate: Note the empty jars on the shelf that can be filled by using the slider. Set the amount to 2.000 moles of carbon (mol C), then press Start. Each jar holds exactly one mole of carbon. Your goal is to determine the mass in grams of two moles of carbon. Before you can find the mass, what do you need to know
Answer:
The molar mass of carbon
Explanation:
Before the mass (in grams) of two moles of carbon can be determined, the molar mass of the element would be needed.
This is because the number of mole of an element is the ratio of its mass and the molar mass. That is,
number of mole = mass/molar mass
Hence, the mass of elements can be obtained by making it the subject of the formular;
mass = number of mole x molar mass
Therefore, the molar mass of carbon would be needed before the mass of 2 moles of the element can be determined.
Cells are the basic unit of life true or false
Which is the following is true about the properties of the mantle?
The mantle produces magnetic fields.
The mantle is hotter the core.
The mantle contains two different layers.
There are rock samples collected from the mantle.
Answer:
it's the 2 I'm pretty sure
Explanation:
please give me a heart
Answer:
Explanation:
sd dsf sd f sdf sdf
Calculate the energy required to heat 179g of ethanol from to . Assume the specific heat capacity of ethanol under these conditions is . Be sure your answer has the correct number of significant digits.
Answer:
9.52 × 10³ J
Explanation:
There is some info missing but I found it on the web.
Calculate the energy required to heat 179g of ethanol from -2.2 °C to 19.6 °C. Assume the specific heat capacity of ethanol under these conditions is 2.44 J/g.°C. Be sure your answer has the correct number of significant digits.
Step 1: Given data
Mass of ethanol (m): 179 gInitial temperature: -2.2°CFinal temperature: 19.6 °CSpecific heat capacity of ethanol (c): 2.44 J/g.°CStep 2: Calculate the temperature change
ΔT = 19.6 °C - (-2.2 °C) = 21.8 °C
Step 3: Calculate the energy required (Q)
We will use the following expression.
Q = c × m × ΔT
Q = 2.44 J/g.°C × 179 g × 21.8 °C
Q = 9.52 × 10³ J
Draw a Lewis structure for C2H3Cl . Include all hydrogen atoms and show all unshared electron pairs. None of the atoms bears a formal charge, and all atoms have octets (except for hydrogen atoms, which have duets).
Answer:
See attached picture.
Explanation:
Hello!
In this case, since C2H3Cl is an organic compound we need a central C-C parent chain to which the three hydrogen atoms and one chlorine atom provides the electrons to get all the octets except for H as given on the statement.
In such a way, on the attached picture you can find the required Lewis dot structure without formal charges and with all the unshared electron pairs, considering there is a double bond binding the central carbon atoms in order to compete their octets.
Best regards!
The lewis structure of given molecule is given below. Carbon has 4 electron. out of which electron make bond with carbon and one with hydrogen and chlorine.
If the compound's molecular formula is known, electron dot structures or Lewis dot formulas can be drawn. It describes the type of bond and the placement of the atoms within the molecule that are joined together. In homage of American chemist Gilbert Newton Lewis, molecules are depicted as having a Lewis electron dot structure or simply a Lewis structure. The lewis structure of given molecule is given below.
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What is the molar mass for Ca(C2H3O2)2?
A. 71g B. 99g C. 158g D. 148g
50 POINTS PLEASE NO FAKE ANSWERS I REALLY NEED THESE ANSWERED
1. The following reaction shows calcium chloride reacting with silver nitrate.
CaCl2 + 2AgNO3 → 2AgCl + Ca(NO3)2
How many grams of AgCl are produced from 30.0 grams of CaCl2?
(Molar mass of Ca = 40.078 g/mol, Cl = 35.453 g/mol, O = 15.999 g/mol, Ag = 107.868 g/mol, N = 14.007 g/mol)
19.4 grams
38.8 grams
58.2 grams
77.5 grams
2. The table shows the recipe and the available ingredients for making the maximum possible number of sandwiches.
Making Sandwiches
Recipe for One Sandwich Ingredients Available
2 cheese slices, 1 ham slice, 2 bread slices 12 cheese slices, 10 ham slices, 12 bread slices
If the ingredients represent reactants of a chemical reaction, which of the following represents the leftover reactant?
Two ham slices
Four ham slices
Two cheese slices
Four cheese slices
3. Read the given chemical reaction.
C2H6 + O2 → CO2 + H2O
How many moles of H2O are produced during the complete combustion of 1.4 moles of C2H6?
2.8 moles
4.2 moles
5.6 moles
7.0 moles
4. The image represents the reaction between a certain number of molecules of N2 and H2.
[IMAGE INCLUDED]
If the maximum possible amount of NH3 is formed during the reaction, what is the leftover reactant?
One molecule of N2
One molecule of H2
Two molecules of N2
Two molecules of H2
A fuel tank holds 22.3 gallons of gasoline. If the density is 0.8206 g/mL, what is the mass in kilograms of gasoline in a full tank
Answer:
[tex]m=69.3kg[/tex]
Explanation:
Hello!
In this case, since the density is computed by dividing the mass of the substance by its occupied volume (d=m/V), we first need to realize that 0.8206 g/mL is the same to 0.8206 kg/L, which means we first need to compute the volume in L:
[tex]V=22.3gal*\frac{3.78541L}{1gal}=84.415L[/tex]
Then, solving for the mass in d=m/V, we get m=d*V and therefore the mass of gasoline in that full tank turns out:
[tex]m=0.8206g/L*84.415L\\\\m=69.3kg[/tex]
Best regards!
1: draw the structural formula for N2 + 3H2 → 2NH3
2: draw the structural formula for 2CO2 + 3H2O → C2H5OH+ 3O2
]down below is a picture with more accurate depiction of the questions plz answer both
Answer:
Hey..! I know only 1st one answer
Which branch of chemistry would be used to make steel?
Answer:
the five major branches of chemistry are organic, inorganic, analytical, physical, and biochemistry.
What is the relationship between particle collisions and reaction rates?
Answer:
Collision theory states that the rate of a chemical reaction is proportional to the number of collisions between reactant molecules. The more often reactant molecules collide, the more often they react with one another, and the faster the reaction rate.
How many molecules are in 50.0 grams of NaOH?
7.53 × 10²³ molecules NaOH
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
50.0 g NaOH
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Na - 22.99 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 50.0 \ g \ NaOH(\frac{1 \ mol NaOH}{40 \ g \ NaOH})(\frac{6.022 \cdot 10^{23} \ molecules \ NaOH}{1 \ mol \ NaOH})[/tex]Multiply: [tex]\displaystyle 7.5275 \cdot 10^{23} \ molecules \ NaOH[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
7.5275 × 10²³ molecules NaOH ≈ 7.53 × 10²³ molecules NaOH
please help !!!
What law states that matter can never be created or destroyed?
A. The law of gravity
B. The law of constant phases
C. The law of conservation of matter
D. The atomic theory
Answer:
C) The law of conservation of matter
Explanation:
Conservation means keeping/ retaining something, in this case it is matter. Hope this helps!
How do we determine the central atom in a chemical bond? How information is need to determine the shape that results in the bonded atoms of the molecule?
Answer:
- the central atom is usually the atom with the lowest subscript in the molecular formula and the atom that can form the most bonds. If all of the atoms usually form the same number of bonds, the least electronegative atom is usually the central atom.
- molecular shape (the shape that a single molecule has) is important in determining how the molecule interacts and reacts with other molecules. Molecular shape also influences the boiling point and melting point of molecules. If all molecules were linear then life as we know it would not exist.