The molar mass of washing soda, Na2CO3•10H2O(s), is Select one: a. 106.0 g/mol. b. 124.0 g/mol. c. 228.0 g/mol. d. 286.0 g/mol.?
回答 (1)
2016-10-24 6:29 pm
Atomic masses : Na = 23.0, C = 12.0, O = 16.0, H = 1.0
Molar mass of Na₂CO₃ = (23.0×2 + 12.0 + 16.0×3) g/mol = 106.0 g/mol
Molar mass of H₂O = (1.0×2 + 16.0) g/mol = 18.0 g/mol
Molar mass of Na₂CO₃•10H₂O = (106.0 + 18.0×10) g/mol = 286.0 g/mol
The answer: d. 286 g/mol
Molar mass of Na₂CO₃ = (23.0×2 + 12.0 + 16.0×3) g/mol = 106.0 g/mol
Molar mass of H₂O = (1.0×2 + 16.0) g/mol = 18.0 g/mol
Molar mass of Na₂CO₃•10H₂O = (106.0 + 18.0×10) g/mol = 286.0 g/mol
The answer: d. 286 g/mol
收錄日期: 2021-04-18 15:42:31
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