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Question

How many moles of R will be produced when 8 mol of P and 5 mol of Q are allowed to react according to the equation?
2P+QR.

A
5
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B
4
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C
2
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D
8
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Solution

The correct option is A 4
Let us consider the problem:
2P+Q=R,
Therefore,
Initial:2P=8,Q=5,R=0
Final:P=44,Q=54(=1),C=4
Hence P is the limiting reactant
Because its moles (=4) are less than those of Q=5
Therefore the correct answer is 4.

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