Thermochemistry Reaction Temperature and Pressure Quiz

word image 93 Question 6 of 20 >

word image 94 8

word image 95 word image 96 word image 97 Consider the reaction.Using the standard enthalpies of formation, what is the standard enthalpy of reaction?

2 Fe203 4 3 02 word image 98 = +824.2 kJ CO(g) + H20(g) —s C02(g) + H2(g)

The formation of 86.0 g of Fe results in

word image 99

mol

O the absorption of 1270 kJ of heat.

O the release of 1270 kJ of heat.

word image 100 Question 19 of 20 > o the absorption of 17700 kJ of hea O the release of 317 kJ of heat. O the release of 17700 kJ of heat.

o the absorption of 317 kJ of heat. word image 101

word image 102 Question 16 of 20 >

word image 103 energy change =

word image 104

Calculate

Calculate

Allsolution(KC1) = 983.5 J/mol.

word image 105

an

change,

mass =

Question 13 of 20 >

Substance aluminum

Specific heat

0.897

graphite

0.709

rhodium

0.243

titanium

0.523

tungsten

0.132

zmc

0.388

water

4.184

word image 106 A hot 114.1 g lump of an unknown substance initially at 162.6 oc is placed in 35.0 mL of water initially at 25.0 oc and the system is allowed to reach thermal equilibrium. The final temperature of the system is 37.8 oc.

Using this information and the specific heat values for several metals in the table, identify the unknown substance.

Assume no heat is lost to the surroundings.

O tungsten O aluminum

graphite rhodium

Question 17 of 20 >

kJ

7

General Chemistry 4th Edition 00

word image 107 University Science Books

presented by Macmillan Learning

Sulfur dioxide, S02 (g), can react with oxygen to produce sulfur trioxide, S03 (g), by the reaction

2 S02(g) + 02(g) 2 sq (g)

The standard enthalpies of formation for S02 (g) and S03 (g) are

AHF [S02(g)] = -296.8 kJ/m01

AHF = -395.7 kJ/m01

Calculate the amount Of energy in the form Of heat that is produced when a volume Of 1.72 L Of S02 (g) is converted to 1.72 L Of S03(g) according to this process at a constant pressure and temperature Of 1.00 atm and 25,0 oc. Assume ideal gas behavior.

energy word image 108

word image 109 Question 14 of 20 >

word image 110 An irregular lump of an unknown metal has a measured density of 3.57 g/mL. The metal is heated to a temperature of 163 oc and placed in a graduated cylinder filled with 25.0 mL of water at 25.0 QC. After the system has reached thermal equilibrium, the volume in the cylinder is read at 32.0 mL, and the temperature is recorded as 43.7 oc. What is the specific heat of the unknown metal sample? Assume no heat is lost to the surroundings.

Question 18 of 20 >

word image 111 The combustion of 1.516 g of carbon disulfide, CS2(l), in a bomb calorimeter with a heat capacity of 4.40 k.J/0C results in an increase in the temperature of the calorimeter and its contents from 22.66 oc to 31.44 cc. CWhat is the internal energy change, AU, for the combustion of 1.516 g of carbon disulfide?

At-I = word image 112 kJ

Calculate the enthalpy of combustion, AHc, for the of carbon disulfide in kilojoules per mole.

Allc – word image 113 kJ/mol

20

word image 114 A 0.981 mol sample of C02 (g) initially at 298 K and 1.00 atm is held at constant volume while enough heat is applied to raise the temperature of the gas by 12.1 K.

word image 115 Assuming ideal gas behavior, calculate the amount of heat (q) in joules required to affect this temperature change and the total change in internal energy, AU. Note that some books use AE as the symbol for internal energy instead of AU.

word image 116

IYpe of gas

Molar heat capacity at constant volume

atoms

 

linear molecules

 

nonlinear molecules

3R

where R is the ideal gas constant

word image 117

word image 118

Question

kJ/mol

word image 119

Question

10

of

20

>

word image 120 12

The temperature of an object increases by 28.5 oc when it absorbs 3657 J of heat. Calculate

word image 121

The mass of the object is 333 g. Use the table of specific heat values to identify the composition

word image 122

The Object is composed Of

word image 123

  • Iron word image 124 o aluminum.
  • gold.

the heat capacity of the object.

J/OC

of the object.

word image 125 Question 5 of 20 >

Which of the substances have a standard enthalpy of formation, Al-IF, equal to zero?

word image 126

C(diamond)

Question 15 of 20 >

word image 127 910 J/(kg.K), and 4190 J/(kg.K).

word image 128

A

295

g

silver

figure

of

liquid

water

at

22.9

when

they

reach

thermal

final temperature:

word image 129 Question 11 of20 >

word image 130

Substance

Specific heat J/(g • 0C)

lead

0.128

silver

0.235

copper

0.385

iron

0.449

aluminum

0.903

word image 131 Question 5 of 20 >

word image 132

word image 133

word image 134 The enthalpy changes, AH, for three reactions are given.

H2(g) + 102(g) —i H20(1) AH = -286 kJ/m01 ca(s) + 2H+(aq) —i Ca2+(aq) + H2(g) AH = —544 kJ/mol

CaO(s) + 2H+(aq) —i Ca2+(aq) + H20(1) AH = -193 kJ/m01

Using Hess’s law, calculate the heat of formation for CaO(s) using the reaction shown.

ca(s) + 102(g) —i CaO(s)

AH = word image 135 kJ/mol

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