Question

Q:A new grill has a mass of 30.0 kg. You put 2.0 kg of charcoal in the grill. You burn all the charcoal and the grill has a mass of 30.0 kg. What is the mass in kg of the gases given off? (assume that the charcoal is pure carbon solid and that it burns completely in oxygen).
A:Mass of carbon burnt = 2Kg = 2000g
Moles of Carbon burnt = 2000/12
=> Moles of CO2 produced = 2000/12
=> Mass of CO2 produced = 2000/12*44 = 2 333.33 g = 2.33 Kg

Where did the 44 come from?

Answer 1

Answer:
44 come from molecular mass of CO2, because Mr=12x1 + 16 x 2 = 44 g/moll.
If we want to find mass of CO2 , we should know its moles and multiply moles to molecular mass.