Mass fraction of sodium in sodium oxide?
| March 31, 2021 | education
Given:
Na2O
To find:
ω (Na in Na2O) -?
Decision:
1) Using the periodic system of D.I.Mendeleev, calculate the relative molecular weight of sodium oxide:
Mr (Na2O) = Ar (Na) * 2 + Ar (O) = 23 * 2 + 16 = 62;
2) Calculate the mass fraction of sodium in sodium oxide:
ω (Na in Na2O) = N (Na in Na2O) * Ar (Na) * 100% / Mr (Na2O) = 2 * 23 * 100% / 62 = 74.2%.
Answer: The mass fraction of sodium in sodium oxide is 74.2%.
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