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Stoichiometric Calculations

If 8mL of unc...

Question

If 8mL of uncombined $O_{2}$ remain after exploding $O_{2}$ with 4mL of hydrogen, the number of mL of $O_{2}$ originally were-

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Solution

The correct option is A 10
${2 H}_{2} + O_{2} ⟶ {2 H}_{2} O 4 m l H_{2} + 1 m l O_{2} 4 m l H_{2} + 2 m l O_{2}$
$∴ 8 m l$ of $O_{2}$ is left and $2 m l$ is used.
$∴$ original $O_{2} = 8 + 2 = 10 m l$

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