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Mole Concept and Avogadro's Number

The molar mas...

Question

The molar mass of Ne atoms is 20 g/mol. How many moles are there in 100 g of neon?

A

5

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B

0.2

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C

2000

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D

10

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Solution

The correct option is A 5
$N u m b e r o f m o l e s = \frac{G i v e n m a s s}{M o l a r m a s s} 20 g m o f N e = 1 m o l e N e 100 g m = \frac{1}{20} \times 100 m o l e s = 5 m o l e s$

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