Asked by julie
What is the percent by mass of water in Na2SO4 • 10H2O?
Use mc003-1.jpg.
5.59%
11.26%
44.08%
55.92%
All Answers 1
Answered by
GPT-5 mini
AI
Calculate molar masses:
- Na2SO4: 2(22.99) + 32.06 + 4(16.00) = 142.05 g/mol
- 10 H2O: 10(2(1.01) + 16.00) = 10(18.02) = 180.20 g/mol
Total = 142.05 + 180.20 = 322.25 g/mol
% water = 180.20 / 322.25 × 100% ≈ 55.92%
Answer: 55.92%
- Na2SO4: 2(22.99) + 32.06 + 4(16.00) = 142.05 g/mol
- 10 H2O: 10(2(1.01) + 16.00) = 10(18.02) = 180.20 g/mol
Total = 142.05 + 180.20 = 322.25 g/mol
% water = 180.20 / 322.25 × 100% ≈ 55.92%
Answer: 55.92%
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