# Problem: The propane fuel (C3H8) used in gas barbecues burns according to the following thermochemical equation: C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g); ΔH˚rxn= -2044 kJ. If a pork roast must absorb 1700 J to fully cook, and if only 13% of the heat produced by the barbecue is actually absorbed by the roast, what mass of CO2 is emitted into the atmosphere during the grilling of the pork roast?

###### FREE Expert Solution

We are asked what mass of CO2 is emitted into the atmosphere during the grilling of the pork roast.

We'll use the thermochemical equation to calculate the mass of CO2.

Molar mass CO2 = 44.01 g/mol

C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g); ΔH˚rxn= -2044 kJ. ###### Problem Details
The propane fuel (C3H8) used in gas barbecues burns according to the following thermochemical equation: C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g); ΔH˚rxn= -2044 kJ. If a pork roast must absorb 1700 J to fully cook, and if only 13% of the heat produced by the barbecue is actually absorbed by the roast, what mass of CO2 is emitted into the atmosphere during the grilling of the pork roast?