how many molecules in a sample of SO3 that has a mass of 1000 grams?
回答 (1)
2016-04-29 3:45 am
Molar mass of SO₃ = 32.06 + 16.00×3 = 80.06 g/mol
1 mole of SO₃ molecules has a mass of 80.06 g/mol.
(6.022 × 10²³) of SO₃ molecules has a mass of 80.06 g.
y SO₃ molecules has a mass of 100 g.
(6.022 × 10²³) / y = 80.06 / 100
y = (6.022 × 10²³) × 100 / 80.06
y = 7.522 × 10²³
Number of SO₃ molecules = 7.522 × 10²³
1 mole of SO₃ molecules has a mass of 80.06 g/mol.
(6.022 × 10²³) of SO₃ molecules has a mass of 80.06 g.
y SO₃ molecules has a mass of 100 g.
(6.022 × 10²³) / y = 80.06 / 100
y = (6.022 × 10²³) × 100 / 80.06
y = 7.522 × 10²³
Number of SO₃ molecules = 7.522 × 10²³
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