Question on: JAMB Chemistry - 2010
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V)
[Ca = 40, N = 14, O = 16]
[Ca = 40, N = 14, O = 16]
A
8.5%
B
13.1%
C
17.1%
D
27.6%
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Correct Option: C
1. **Determine the formula of calcium trioxonitrate (V):** The formula is Ca(NO₃)₂.
2. **Calculate the molar mass of Ca(NO₃)₂:**
* Ca: 1 x 40 = 40 g/mol
* N: 2 x 14 = 28 g/mol
* O: 6 x 16 = 96 g/mol
* Total molar mass = 40 + 28 + 96 = 164 g/mol
3. **Calculate the mass of nitrogen in Ca(NO₃)₂:**
* Mass of N = 2 x 14 = 28 g/mol
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