Chemistry · 2019
JEE Main · 12 April 2019, Shift 1 · Q51
5 moles of AB_2 weigh 125 × 10^-3 kg and 10 moles of A_2 B_2 weigh 300 × 10^-3 kg. The molar mass of A ( M_A ) and molar mass of B ( M_B ) in kg…
$\displaystyle 5$ moles of $\displaystyle \mathrm{AB}_2$ weigh $\displaystyle 125 \times 10^{-3} \mathrm{~kg}$ and $\displaystyle 10$ moles of $\displaystyle A_2 B_2$ weigh $\displaystyle 300 \times 10^{-3} \mathrm{~kg}$. The molar mass of A $\displaystyle \left(\mathrm{M}_{\mathrm{A}}\right)$ and molar mass of $\displaystyle \mathrm{B}\left(\mathrm{M}_{\mathrm{B}}\right)$ in $\displaystyle \mathrm{kg} \mathrm{mol}^{-1}$ are :
Official answer
(1)
$\displaystyle \mathrm{M}_{\mathrm{A}}=5 \times 10^{-3} \text { and } \mathrm{M}_{\mathrm{B}}=10 \times 10^{-3}$
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JEE Main 2019 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.