Methane gas reacts with oxygen by combustion. How many moles of methane are needed to produce 3.5x10^-4 moles of carbon dioxide?

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.