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Isotopes, Isotones and Isobars

The molar mas...

Question

The molar mass of $O_{2}$ is 32 gram per mole. How many moles are there in 10 grams of oxygen?

3.2

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320

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0.3125

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0.42

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Solution

The correct option is B 0.3125
$n o . o f m o l e s = \frac{G i v e n m a s s}{M o l a r m a s s} 32 g m o f O_{2} = 1 m o l e O_{2} 10 g m = \frac{1}{32} \times 10 m o l e s = 0.3125 m o l e s$

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