Please solve q 72?

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1 Answer
Junaid Mirza
Apr 18, 2018

"4 mol"

Explanation:

"2P + Q"\ ->\ "R"

We have

  • 8 mol of "P"
  • 5 mol of "Q"

color(black)(——————)

Multiply the chemical equation on both the sides by 5

"10P + 5Q"\ ->\ "5R"

For 5 mol of "Q" we need 10 mol of "P". But, we have only 8 mol of "P". So, we can’t get 5 mol of "R"

color(black)(——————)

Multiply the chemical equation on both the sides by 4

"8P + 4Q"\ ->\ "4R"

For 8 mol of "P" we need 4 mol of "Q". We have 5 mol of "Q". Therefore, at the end of the reaction we get 4 mol of "R" and 1 mol of "Q" which is in excess.

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