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2015-02-11T21:10:00+05:30

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So 23 g Na has 6.023 x 10 ²³ atoms

⇒  \frac{23}{10}  g Na has 6.023 x 10 ²² atoms

so 6.023 x 10 ²² atoms ANSWER
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2015-02-12T11:05:10+05:30

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the atomic no of Na is 23 g which has 6.023 * 10^23

hence 2.3 g will have   ----------------->    ( 2.3 * 6.023 * 10^23) / 23   =   6.023 * 10^22

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