Calculate the mass fraction of sodium in sodium oxide.
| March 6, 2021 | education
Formula for calculating the mass fraction of an element in a substance:
w = n * Ar (chemical element) / Mr (substance), where n is the number of atoms of a given chemical element.
1) Find the relative molecular weight of the substance (Na2O):
Mr (Na2O) = 2 * Ar (Na) + Ar (O) = 46 + 16 = 62
2) Find the mass fraction of a given element in the substance:
w (Na) = 46/62 = 0.74 or 74%
Answer: The mass fraction of sodium in sodium oxide is 74%.
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