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How many kg of Na2SO4 will be produced using 80 kg of NaCl? Assume CaSO4 in excess.

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How many kg of Na2SO4 will be produced using 80 kg of NaCl? Assume CaSO4 in excess.

(a) 122 kg

(b) 142 kg

(c) 162 kg

(d) 182 kg

I got this question in an interview for internship.

Origin of the question is Stoichiometry-III in section Material Balances without Reaction and Material Balances Involving Reactions of Chemical Process Calculation

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The correct answer is (b) 142 kg

Explanation: 2 mole of NaCl = 1 mole of Na2SO4.

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