1. Determine the amount of heat abs orbed when 35.77 grams of O2 are produced according to the equation. CO2(9) → C (diamond) + O2(g) AH = 395.4 kJ

Chemistry for Engineering Students
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Author:Lawrence S. Brown, Tom Holme
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Chapter9: Energy And Chemistry
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Problem 9.102PAE: 9.102 A runner generates 418 kJ of energy per kilometer from the cellular oxidation of food. The...
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Determine the amount of heat (In RJ) given off per 65.3g of NH3
used.
mol
Solution:
Given:
mass of NH3
= 65.3 g
-904 kJ
Conversion factor:
i mol NH3
hea
Unknown:
Computation:
Heat evolved = 65.3 NH
GENERAL CHEMISTRY 2 | U
You
Ariana Lher+31
ACTIVITY
Directions: Solve the following word problems.
1. Determine the amount of heat abs orbed when 35.77 grams of O2 are produced according to
the equation.
CO2 (g) → C (diamond) +
O2(g)
AH = 395.4 kJ
2. Octane, a major component of gasoline, burns according to the reaction:
16CO16(9) + 18H2O(g)
2C8H1 8(0) + 2502(g) →
AH = -1.10 x 104 kJ
SELF - ASSESSMENT
Directions: Solve the following word problems.
1. Methanol undergoes combustion according to the equation:
302(g) >
2CH3OH0)
2CO2(9) +
4 H2O(1)
AH = -1 452.8 kJ
+
Find the amount of heat given off from the combustion of 323.2 g CH3OH.
2. Calculate the heat evolved when 266 g of white phosphorus (P4) burns in air according to the
equation:
P4(s)
502(9)
P4O10(s)
AH = -3013 kJ/mol
+
3. Given the thermochemical equation
2SO29) + O2 (9) → 2SO3(9)
AH = -198.2 kJ/mol
calculate the heat evolved when 87.9 g of SO2 (molar mass = 64.07 g/mol) is converted to SO3.
Page |4
GENERAL CHEMISTRY 2 | UMAK- HSU-MATHEMATICS, SCIENCE & RESEARCH DEPARTMENT
ASSIGNMENT
Directions: Solve the given problem below.
1. Nitrogen and oxygen gas combine to form nitrogen dioxide according to the following reaction:
N2(g)
202(g)
2NO2(g)
+
Calculate the change in enthalpy for this reaction using the following reactions:
N2 (g)
Oz(g)
2NO(g)
AHO rxn = 181 kJ
2NO9)
+ O2(g)
2NO2(9)
AH° rxn = -113KJ
Transcribed Image Text:Determine the amount of heat (In RJ) given off per 65.3g of NH3 used. mol Solution: Given: mass of NH3 = 65.3 g -904 kJ Conversion factor: i mol NH3 hea Unknown: Computation: Heat evolved = 65.3 NH GENERAL CHEMISTRY 2 | U You Ariana Lher+31 ACTIVITY Directions: Solve the following word problems. 1. Determine the amount of heat abs orbed when 35.77 grams of O2 are produced according to the equation. CO2 (g) → C (diamond) + O2(g) AH = 395.4 kJ 2. Octane, a major component of gasoline, burns according to the reaction: 16CO16(9) + 18H2O(g) 2C8H1 8(0) + 2502(g) → AH = -1.10 x 104 kJ SELF - ASSESSMENT Directions: Solve the following word problems. 1. Methanol undergoes combustion according to the equation: 302(g) > 2CH3OH0) 2CO2(9) + 4 H2O(1) AH = -1 452.8 kJ + Find the amount of heat given off from the combustion of 323.2 g CH3OH. 2. Calculate the heat evolved when 266 g of white phosphorus (P4) burns in air according to the equation: P4(s) 502(9) P4O10(s) AH = -3013 kJ/mol + 3. Given the thermochemical equation 2SO29) + O2 (9) → 2SO3(9) AH = -198.2 kJ/mol calculate the heat evolved when 87.9 g of SO2 (molar mass = 64.07 g/mol) is converted to SO3. Page |4 GENERAL CHEMISTRY 2 | UMAK- HSU-MATHEMATICS, SCIENCE & RESEARCH DEPARTMENT ASSIGNMENT Directions: Solve the given problem below. 1. Nitrogen and oxygen gas combine to form nitrogen dioxide according to the following reaction: N2(g) 202(g) 2NO2(g) + Calculate the change in enthalpy for this reaction using the following reactions: N2 (g) Oz(g) 2NO(g) AHO rxn = 181 kJ 2NO9) + O2(g) 2NO2(9) AH° rxn = -113KJ
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