Calculate the mass fraction of copper in copper (II) hydroxide.
| May 1, 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 (Cu (OH) 2):
Mr (Cu (OH) 2) = Ar (Cu) + 2 * Ar (O) + 2 * Ar (H) = 64 + 32 + 2 = 98
2) Find the mass fraction of a given element in the substance:
w (Cu) = 64/98 = 0.65 or 65%
Answer: Mass fraction of copper in copper (II) hydroxide is 65%.
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