Pls help, it’s due today

Ba(NO3)2
How many moles of oxygen are in this substance?

What is the formula for the molecular compound nitrogen monoxide

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

How to convert a density of 0.791g/cm3 to lb/ft3