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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