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Question
Choose the correct option.
Which of the following has maximum number of molecules?
Options
7gN2
2gH2
8gO2
20gNO2
Solution
2gH2
Explanation:
1 mole of any element contains 6.023 × 1023 molecules.
1 g mole of O2 = 32 g O2
⇒ 16 g of O2 = 0.5 g mole O2
1 g mole of N2 = 28 g N2
⇒ 7 g N2 = 0.25 g mole N2
1 g mole of H2 = 2 g H2
⇒ 2 g H2 = 1.0 g mole H2
1 g mole NO2 = 14 + 16 × 2 = 46
⇒ 16 g of NO2 = 0.35 mole NO2
2 g H2 (1 g mole H2) contain maximum molecules.
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