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Standard X

Chemistry

Relationship between Vapor Density & Relative Molecular Mass

What volume o...

Question

What volume of HCl solution of density 1.2 g/ $c m^{3}$ and containing $36.5 %$ by weight HCl, must bw allowed to react with zinc (Zn) in order to liberate 4.0 g of hydrogen?

333.33 mL

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500 mL

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614.66 mL

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None of these

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Solution

The correct option is A 333.33 mL
$Z n + 2 H C l \to Z n C l_{2} + H_{2}$ ;
moles of $H_{2}$ evolved $= 2$
$∴$ moles of $H C l$ required $= 4$
$∴ \frac{V \times 1.2 \times 0.365}{36.5} = 4$
$V = 333.33 m L$

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What volume of HCl solution of density 1.2 g/cm3 and containing 36.5% by weight HCl, must bw allowed to react with zinc (Zn) in order to liberate 4.0 g of hydrogen?

The correct option is A 333.33 mLZn+2HCl→ZnCl2+H2;moles of H2 evolved =2 ∴ moles of HCl required =4 ∴V×1.2×0.36536.5=4V=333.33mL

What volume of HCl solution of density 1.2 g/ $c m^{3}$ and containing $36.5 %$ by weight HCl, must bw allowed to react with zinc (Zn) in order to liberate 4.0 g of hydrogen?

The correct option is A 333.33 mL
$Z n + 2 H C l \to Z n C l_{2} + H_{2}$ ;
moles of $H_{2}$ evolved $= 2$
$∴$ moles of $H C l$ required $= 4$
$∴ \frac{V \times 1.2 \times 0.365}{36.5} = 4$
$V = 333.33 m L$