Need urgent help with chemistry moles please?

Posted on 2016-05-18 18:26:00 in Chemistry by ANTHONY

I have a bad chemistry teacher, and these type of questions are generally easy but im not sure how to do them. 

1. You have to prepare some 2M solutions, with 10g of solute in each. What volume of solution will you preparem for each solute below? 
a) Lithium sulfate 
b) Magnesium sulfate 
c ammonium nitrate 

2. Phosphorus forms two oxides, which have the empirical formulae P2O3 and P2O5 
a) what mass of phosphorus will combine with 1 mole of oxygen molecules (O2) to form P2O3? 
b) What is the molecular formula of the oxide that has a formula mass of 284

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