Question

Which one has minimum number of atom?

(a) 8g O2 gas
( b) 1g H gas
(c)7 g nitrogen gas
(d) 1.5 g helium gas
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Answer 1

Answer: 1 g H2 gas

Explanation:

8g O2 = 0.25 moles

1g H2 = 0.50 moles [I assume you mean H2, not H. If it is H, then moles = 1.0 moles H

7g N2 = 0.25 moles

1.5 g He = 0.43 moles

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The moles above are based on molecules. All but He are multiplied by 2 to give the number of atoms. If H2 is correct, it has the greatest number of atoms. (Not if it is just H).