What is the ionic compound formula for sodium Chloride

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h

How many molecules are in 6.0 moles of methane