A mixture of \( 2 \times 10^{21} \) molecules of \( \mathrm{P} \) and \( 3 \times 10^{21} \) mol...

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A mixture of \( 2 \times 10^{21} \) molecules of \( \mathrm{P} \) and \( 3 \times 10^{21} \) molecules of \( \mathrm{Q} \) weighs \( 0.60 \mathrm{~g} \). If the molecular mass of \( \mathrm{P} \) is 45 , then the molecular mass of \( \mathrm{Q} \) will be \( \left(N_{\mathrm{A}}=6 \times 10^{23}\right) \)(a) 45(b) 180(c) 90
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