Mole ConceptHard

Question

A mixture of 2 × 1021 molecules of P and 3 × 1021 molecules of Q weighs 0.60 g. If the molecular mass of P is 45, then the molecular mass of Q will be (NA = 6 × 1023)

Options

A.45
B.180
C.90
D.270

Solution

$\frac{2 \times 10^{21}}{6 \times 10^{23}} \times 45 + \frac{3 \times 10^{21}}{6 \times 10^{23}} \times M_{Q} = 0.6 \Rightarrow M_{Q} = 90$

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