Science Homework Help

A compound was found to contain nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is?

If 0.50 mole of BaCl2 is mixed with 0.20 mol of Na3 PO4, the maximum number of moles of Ba3 (PO4) 2 that can be formed is?

An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 ml. The volume of 0.1 N NaOH required to completely neutralize 10 ml of this solution is?