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GCSE Chemistry - Calculations, Moles and Concentrations

Hi,
I need help with calculating concentrations of solutions with moles. How do I work out these?

1) What is the concentration in mol/dm^3 of a solution containing 0.25 mol solute in a 250 cm^3 solution?
2) How many moles of solute are in 50cm^3 of a 2.0mol/dm^3 solution?
Reply 1
1) Formula is concentration= mol divide volume
2)Apply same formula, but re arrange

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