1.

There were 10 moles of a substance present initially in a system, 5 moles were added to it and a reaction occurred so that its moles are reduced by 20%, what are the final moles of a substance in the system?(a) 10(b) 12(c) 15(d) 18

Answer» Correct option is (b) 12

Easiest explanation: Final moles of substance = (10 + 5)*80/100 = 12.


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