Problem: A propane tank on a home barbeque contains 11.3x103 g of propane. Use the value for ΔHrxn provided in the text to calculate the total amount of heat produced when the entire contents of the tank of propane is burned. What mass of water could be warmed from 25˚C to 100˚C with this much heat?

FREE Expert Solution

Balanced equation: C3H8 + 5O→  3CO2 + 4H2O


ΔH°rxn=ΔH°f, prod-ΔH°f, react


ΔH°rxn=(4 mol H2O)-285.8 kJ1 mol H2O+(3 mol CO2)(-393.5 kJ1 mol CO2)           -(1 mol C3H8)-103.85 kJ1 mol C3H8+0


ΔH˚rxn = –2219.85 kJ/ mol C3H8


q = ΔH°rxn×moles C3H8= -2219.85 kJ mole C3H8×11.3×103 g C3H8×1 mole C3H844.10 g C3H8

q = –568805 kJ


For water: 


q = mcT


-qpropane = +qwater

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Problem Details

A propane tank on a home barbeque contains 11.3x103 g of propane. Use the value for ΔHrxn provided in the text to calculate the total amount of heat produced when the entire contents of the tank of propane is burned. What mass of water could be warmed from 25˚C to 100˚C with this much heat?

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