HARDMCQ SINGLEJEE Advanced ChemistryInorganic ChemistryMole conceptBasic stoichiometry, POAC, percent yield & limiting reagent
A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with \(\mathrm{Na_2CO_3}\) to precipitate the calcium as calcium carbonate. This \(\mathrm{CaCO_3}\) is heated to convert all the calcium to CaO and the final mass of CaO is 1.62 gms. The % by mass of \(\mathrm{CaCl_2}\) in the original mixture is :
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Explanation
This question uses stoichiometry and limiting reagent. Write the balanced chemical equation, compute moles of each reactant, identify the limiting reagent, and use stoichiometric ratios (and % yield, if needed) to obtain the answer; this gives option B.
Stoichiometry and limiting reagent
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