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  • In a vessel having a volume of 7.50 L, find the mass of hydrogen which was covered over water at <img alt="25^{\circ} \mathrm{C}" src="https://entrancecorner.oncodecogs.com/gif.latex?25%5E%7B%5Ccir

In a vessel having a volume of 7.50 L, find the mass of hydrogen which was covered over water at 25^{\circ} \mathrm{C} and 650 mm of Hg  if vapour pressure of water at this temperature is 10.6 mm of Hg

Option: 1

0.283 \mathrm{~g}


Option: 2

0.50 \mathrm{~g}


Option: 3

0.589 \mathrm{~g}


Option: 4

7.14 \mathrm{~g}


Answers (1)

best_answer

Volume of \mathrm{H}_2 at STP

\mathrm{V_2=\frac{P_1 V_1}{T_1} \times \frac{T_2}{P_2}}

V.P. of \mathrm{H}_2 at\mathrm{25^{\circ} \mathrm{C}=650-18.6} \mathrm{=631.4 \mathrm{~mm} \text { of } \mathrm{Hg}}

\mathrm{\begin{aligned} V_2 & =\frac{631.4 \times 7.50 \times 273}{298 \times 760} \\ & =5.70 \mathrm{~L} \end{aligned}}

At STP, 22.7L \mathrm{ \mathrm{H}_2}  weigh  2 g

\mathrm{\text { So 5.70L } \mathrm{H}_2 \text { will weigh }=\frac{2}{22.7} \times 5.70}

\mathrm{=0.50 \mathrm{~g} .}

Posted by

Nehul

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