HELP M PERFECT THIS PL (its on weathering and erosion) (5-7 sentences pls!) Can someone with like 1mil ppl helped answer me LOL This is on vegetation HELP THIS WAS DUE 30 DAYS AGO

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.

The answer for #3 is c but i don't know why

Agas diffuses 1/7 times faster than hydrogen gas (h2). what is the molar mass of the gas? 100.10 g/mol 98.78 g/mol 86.68 g/mol 79.98 g/mol