how many molecules are in 19.9 g NO2?
回答 (1)
2016-03-02 5:46 am
Molar mass of NO₂ = 14.0 + 16.0×2 = 46.0 g/mol
No. of moles of NO₂ = 19.9/46.0 = 0.433 mol
1 mole of NO₂ contains 6.02 × 10²³ molecules.
No. of NO₂ molecules = (6.02 × 10²³) × 0.433 = 2.61 × 10²³
No. of moles of NO₂ = 19.9/46.0 = 0.433 mol
1 mole of NO₂ contains 6.02 × 10²³ molecules.
No. of NO₂ molecules = (6.02 × 10²³) × 0.433 = 2.61 × 10²³
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