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Stoichiometric Calculations

One litre of ...

Question

One litre of $O_{2}$ and one litre of $H_{2}$ are taken in a vessel of 2 litre capacity at NTP. The gases are made to combine to form water. Calculate the mass (in gm) of gas left in the vessel.
Write the numerical value ( upto 2 digit only) after decimal point only as for 0.19, write 19).

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Solution

$The given reaction is Volume before reaction (in litre) Volume after reaction (litre) 2 H_{2} + 10 O_{2} 1 0.5 \to 2 H_{2} O 01$
Mole of $O_{2} l e f t = \frac{1 \times 0.5}{0.0821 \times 293} = 2.07 \times 10^{- 2}$
$∴$ Mass of $O_{2}$ left $= 2.07 \times 10^{- 2} \times 32 = 0.6651 g$
so answer is 66.

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