Calculate the mass in grams of CO^2 in 45.0 L of CO^2 at STP

Hey can you me with this i really need y’all

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.

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as