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7. (a) Calculate the number of molecules present in 280cm3 of hydrogen gas. (b) The preparation of chlorine gas can be represented by the equation below MnO2(s) + HCl(aq) MnCl2(s) + H2O(l) + Cl2(g) i) Copy and balance the given equation. ii) Calculate the number of moles of HCl which are required to react with 25g of MnO2. iii) Calculate the volume chlorine gas that will be obtained by using the 25g of MnO2.
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