What property could be a chemical property of hydrogen

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

How many molecules are in 6.0 moles of methane

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?