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) 18I have been asked this question by my school principal while I was bunking the class.I want to ask this question from Material Balance Concept topic in portion Introduction to Material Balances of Basic Chemical Engineering

There were 10 moles of a substance present initially in a system, 5 mo

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) 18I have been asked this question by my school principal while I was bunking the class.I want to ask this question from Material Balance Concept topic in portion Introduction to Material Balances of Basic Chemical Engineering
Answer» CORRECT option is (b) 12 Easiest explanation: FINAL MOLES of substance = (10 + 5)*80/100 = 12.

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