1.

There were 15 moles of a substance present initially in a system, 25 moles were added to it and a reaction occurred so that its moles are reduced by 50%, what are the final moles of a substance in the system?(a) 10(b) 15(c) 20(d) 40

Answer» Right option is (c) 20

The best explanation: Final moles of substance = (15 + 25)*50/100 = 20.


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