How many moles of Sulphur are formed from 2 moles of CaS_5 in the following reaction? CaS_5 + CaS_2O_3 + HCl

JEE Main Chemistry question

How many moles of Sulphur are formed from 2 moles of in the following reaction?

Answer: 12

Solution

Calcium pentasulphide and calcium thiosulphate comproportionate on treatment with HCl, with every sulphur atom from both species (none left as sulphate or sulphide) deposited as elemental sulphur, the oxygen leaving as water: 2CaS_5+CaS_2O_3+6HCl\rightarrow3CaCl_2+3H_2O+12S. (Check: Ca 3=3; S on the left,

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Question ID VK-147116