1) Which of the following is an example of an endothermic process?

a) a chocolate bar melting in hot car

b) a package of fruit freezing in a freezer

c) burning gasoline in a combustion engine

d) moisture forming on a glass of iced water

2) Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy change of the decomposition of propane?

3 C + 3 O2 yields 3 CO2 deltaH = - 1182 kJ

4 H2 + 2 O2 yields 4 H2O deltaH = - 1144 kJ

C3H8 + 5 O2 yields 3 CO2 + 4 H2O deltaH = - 2222 kJ

C3H8 yields 3 C + 4 H2 deltaH = ? kJ

(-1182) - [ (-2222) + (-1144) ]

(-2222) - [ (-1182) + (-1144) ]

(-1182) + (-1144) + (-2222)

(-2222) + (-1182) - (-1144)

Question

Chemistry

Guillermo

3 February, 20:55

1) Which of the following is an example of an endothermic process?

a) a chocolate bar melting in hot car

b) a package of fruit freezing in a freezer

c) burning gasoline in a combustion engine

d) moisture forming on a glass of iced water

2) Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy change of the decomposition of propane?

3 C + 3 O2 yields 3 CO2 deltaH = - 1182 kJ

4 H2 + 2 O2 yields 4 H2O deltaH = - 1144 kJ

C3H8 + 5 O2 yields 3 CO2 + 4 H2O deltaH = - 2222 kJ

C3H8 yields 3 C + 4 H2 deltaH = ? kJ

(-1182) - [ (-2222) + (-1144) ]

(-2222) - [ (-1182) + (-1144) ]

(-1182) + (-1144) + (-2222)

(-2222) + (-1182) - (-1144)

+2

Answers (1)

Know the Answer?

Ernie · Answer 1

For the first question, the correct answer among the choices listed is option A, a chocolate bar melting in hot car. It is an endothermic process because it absorbs heat energy for it to be melted. For the second question, it think the correct answer is the last option, (-2222) + (-1182) - (-1144).