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A student investigated the rate of reaction between magnesium and hydrochloric acid. The equation for the reaction is: Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g)\text{Mg(s)} + 2\text{HCl(aq)} \rightarrow \text{MgCl}_2\text{(aq)} + \text{H}_2\text{(g)}Mg(s)+2HCl(aq)→MgCl2​(aq)+H2​(g) The diagram below shows the volume of hydrogen gas collected in an inverted 100 cm3100\text{ cm}^3100 cm3 measuring cylinder after 30 seconds30\text{ seconds}30 seconds and after 90 seconds90\text{ seconds}90 seconds. Two identical inverted graduated cylinders are shown side-by-side to measure gas volume from 0 to 100 cm³. On the left, labeled '30 seconds', the water level is displaced down to the 42 cm³ mark (indicating 42 cm³ of gas is collected). On the right, labeled '90 seconds', the water level is displaced down to the 78 cm³ mark (indicating 78 cm³ of gas is collected).

Determine the number of moles of hydrogen collected between 30 seconds30\text{ seconds}30 seconds and 90 seconds90\text{ seconds}90 seconds. The volume of one mole of any gas at room temperature and pressure is 24 dm324\text{ dm}^324 dm3. Give your final answer to two significant figures.

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Rate of reaction Questions

Practise AQA GCSE Chemistry Rate of reaction with exam-style questions for Foundation and Higher tier. 46 questions covering Calculating rates of reactions, Factors which affect the rates of chemical reactions, Collision theory and activation energy, and Catalysts, matched to the AQA GCSE Chemistry (8462) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Rate of reaction Questions

  1. GCSE
  2. /Chemistry
  3. /Rate of reaction