What is the formula for finding concentration from number of moles and volume?

A student has 10.0 g of NaBr, and wants to use it to make a NaBr solution with a concentration of 0.0400 mol dm^-3.

If she wants to use the whole 10.0 g, what volume of solution will she need to make?

Give your answer to 3 significant figures.

A beaker contains 1.50 dm³ of 0.800 mol dm^-3 NaOH

Calculate the mass of NaOH in the solution.

5.00 g of KNO₃ is dissolved in 100 cm³ of water.

Calculate the concentration in g dm^-3.

2.50 mol of KBr is dissolved in 4.00 dm³ of water.

Calculate the concentration in mol dm^-3.

How do you convert from units of g dm^-3 into mol dm^-3?

How do you convert from units of cm³ into dm³?