Property of salt investigated by the observation of sodium carbonate decahydrate crystals exposed for two days

What does x represent in the formula for the compound xcl4?

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

Give the orbital configuration of the phosphorus (p) atom.