Ionic, metallic, or covalent??? Need now

Write a net ionic equation to show that hydrofluoric acid, behaves as an acid in water.

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?