Questions using Molarity in reactions

Calculate the following:

1)  25cm3 of  3 moldm-3 hydrochloric acid was exactly neutralised by 35cm3 of sodium hydroxide solution.  What is the concentration of the sodium hydroxide solution?

2)  50cm3 of 2 moldm-3 sulphuric acid was exactly neutralised by 80cm3 of calcium hydroxide solution.  What is the concentration of the calcium hydroxide solution?

3)  What mass of sodium hydroxide must be added to 500cm3 of water to make a 0.5 moldm-3 solution

4)  150cm3 of Nitric acid was exactly neutralised by 100cm3 of 1 moldm-3 sodium oxide solution.  What is the concentration of the Nitric acid?

5)  6g of lithium oxide is added to 100cm3 of water.  What is the concentration of the solution formed?

6)  65cm3 of hydrochloric acid was exactly neutralised by 35cm3 of 0.5 moldm-3 sodium hydroxide solution.  What is the concentration of the hydrochloric acid?

7)  25cm3 of sulphuric acid was exactly neutralised by 5g of sodium.  What is the concentration of the sulphuric acid?