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  • A 10 g Mixture of Hydrogen and Helium is contained in a vessel of capacity  a

A 10 g Mixture of Hydrogen and Helium is contained in a vessel of capacity .0125 \mathrm{m}^3 at 6 bar and 27^{\circ} \mathrm{C}. The mass of helium in the Mixture is --g ?

Option: 1

7


Option: 2

8


Option: 3

10


Option: 4

12


Answers (1)

best_answer

\mathrm{P V=n_{\text {mix }} R T}

\mathrm{n_{\text {mix }}=\frac{6 \times 12.5}{.082 \times 300} \approx 3}

\mathrm{\text { out of total } 3 \text { moles Let moles at } \mathrm{He}=x}

\mathrm{Moles \ of \ H_2=3-x}

\mathrm{Then \ total \ Mass \ of \ the \ Mixture \ will \ be =4 x+2(3-x)=10}

\mathrm{\text { Number of Moles of the He gas } x=2 \mathrm{Mol}}

\mathrm{mass \ of \ \mathrm{He}= Number \ of \ Mole \times Molar \ Mass =8 g}

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