Haii!! Which one is yours? I'm Cancer! :3

In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. part a write a balanced chemical equation for this reaction. express your answer as a chemical equation. identify all of the phases in your answer.

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

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million