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?