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The number of molecules and moles in 2.8375 litres of O₂ at STP are respectively

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$7.596 \times 10^{22} and 0.1266 mol$

$7.527 \times 10^{22} and 0.250 mol$

$1.505 \times 10^{23} and 0.250 mol$

$7.527 \times 10^{23} and 0.125 mol$

answer is C.

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Detailed Solution

$Number of moles = \frac{2.8375}{22.4} = 0.1266 m o l e s Numbers of molecules = 0.1266 \times 6 \times 10^{23} = 7.596 \times 10^{22}$

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