Neco 2021 Chemistry Question 5
Practice essay / theory question 5 from the 2021 Neco Chemistry examination. This question covers Stoichiometry, Limiting reagent, Percent yield .
A 5.00 g alloy contains magnesium and calcium. The alloy is 90 % Mg by mass and the remaining 10 % is Ca. The alloy is placed in excess hydrochloric acid. The reactions are: \(\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2\) \(\text{Ca} + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\) Assume the acid is in large excess. (a) Calculate the total number of moles of hydrogen gas that can be produced theoretically from the alloy. (b) Determine the mass of magnesium chloride that would be formed. (c) In the experiment, 0.75 L of hydrogen gas is collected at 298 K and 1.00 atm. Calculate the percent yield of hydrogen gas based on the theoretical amount obtained in part (a).
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This is Neco 2021 Chemistry Question 5. It is one of the essay questions from the 2021 Neco Chemistry examination.
The question covers Stoichiometry, Limiting reagent, Percent yield .
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