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# OCR A-level Chemistry Concentration and moles The mole ratio is the ratio between the amount of moles in the compounds of a reaction. The mole ratio can be used as a conversion factor between reactants nd products, and can be worked out by looking at the coefficients in front of A solution formed when a solute dissolves in a solvent has a concentration which can be calculted by dividing the mass of dissolved dolute in g by the volume of the solution in dm³ giving the concentration in g/dm³. You can calculate the concentration in mol/dm³ of a solution by calculating the moles and dividing by the volume of the solution. # ✅

How many moles in 4.515 x 10²³ atoms of a substance? # ✅

What is the number of moles in 40g of Calcium? # ✅

8 g of NaOH is dissolved in 2 dm³ water. What is the concentration of this solution? # ✅

Convert 20 cm³ into dm³. # ✅

You are making a solution of NaOH has a concentration of 5 g/dm³. What is the mass of NaOH you'd need to dissolve in 2 dm³ water? # ✅

Convert 30 ml into dm³. # ✅

200 cm³ dilute HCl contains 0.25 mol dissolved hydrogen chloride. What is the concentration of the acid in mol/dm³? # ✅

You are making a solution of HCl has a concentration of 2 mol/dm³. What is the volume of water you'd need to dissolve 0.5 mol NaOH in?  Have you found the questions useful?