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# OCR GCSE 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? # ✅

What is the mole ratio between O₂ and H₂O in this reaction: 2 H₂ (g) + O₂ (g) → 2 H₂O (g)? # ✅

What is the mole ratio between Hg(OH)₂ and Hg₃(PO₄)₂ in this reaction: 3 Hg(OH)₂ + 2 H₃PO₄ → Hg₃(PO₄)₂ + 6 H₂O ? # ✅

If 0.01 moles of CO are used in the following reaction: 4 CO + 9 H₂ -> C₄H₁₀ + 4 H₂O, how many moles of C₄H₁₀ are produced? # ✅

Convert 0.08 kg into g. # ✅

50 cm³ dilute HCl contains 0.1 g dissolved hydrogen chloride. What is the concentration of the acid (in g/dm³)? # ✅

You are making a solution of HCl has a concentration of 8 g/dm³. What is the volume of water you'd need to dissolve 0.002 kg NaOH in? # ✅

0.5 mol of NaOH is dissolved in 2 dm³ water. What is the concentration in mol/dm³? # ✅

100 cm³ dilute HCl contains 0.5 g dissolved hydrogen chloride. What is the concentration of the acid in mol/dm³?  Have you found the questions useful?