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Question
Which of the following pairs have the same number of atoms?
(i) \[\ce{16 g of O2 (g) and 4 g of H2(g)}\]
(ii) \[\ce{16 g of O2 and 44 g of CO2}\]
(iii) \[\ce{28 g of N2 and 32 g of O2}\]
(iv) \[\ce{12 g of C(s) and 23 g of Na(s)}\]
Short Note
Solution
(iii) \[\ce{28 g of N2 and 32 g of O2}\]
(iv) \[\ce{12 g of C(s) and 23 g of Na(s)}\]
Explanation:
(iii) Number of atoms of nitrogen = `"Mass"/"Atomic mass" xx 6.023 xx 10^23`
= `28/14 xx 6.023 xx 10^23`
= `2 xx 6.023 xx 10^23`
(iv) Number of atoms of carbon = `12/12 xx 6.023 xx 10^23`
= `6.023 xx 10^23`
Number of atoms of sodium = `23/23 xx 6.023 xx 10^23`
= `6.023 xx 10^23`
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