Can someone please help me with this!!! Please include work! Help would be appreciated

As a part of an experiment a student burns propane to produce carbon dioxide and water she remembers that she must follow the law conservation of matter when writing a balanced chemical equation which of these equation adheres to the law of conservation of matter

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?