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 = - kj
c3h8 yields 3 c + 4 h2 deltah = ? kj
(-1182) - [(-) + (-1144)]
(-) - [(-1182) + (-1144)]
(-1182) +(-1144) + (-)
(-) + (-1182) - (-1144)