Question

Charcoal is primarily carbon. Determine the mass of CO2 produced by burning enough carbon (in the form of charcoal) to produce 450 kJ of heat. C(s)+O2(g)→CO2(g)ΔH∘rxn=−393.5kJ

Answer 1

C(s) + O2(g) → CO2(g) ΔH∘rxn=−393.5kJ

C(s) + O2(g) → CO2(g)   

44 g   393.5 kJ of heat

? 450 kJ of heat

From the above equation, we can say that

44 g of CO2 produced by burning enough carbon (in the form of charcoal) to produce 393.5 kJ of heat.

So, ? g CO2 produced by burning enough carbon (in the form of charcoal) to produce 450 kJ of heat.   

? = 44 g of CO2 x (450 kJ of heat / 393.5 kJ of heat)

= 50.31 g of CO2

Therefore,

mass of CO2 produced =  50.31 g