Question on: JAMB Chemistry - 2010
Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120oC.
[Cu = 64, S = 32, O = 16]
[Cu = 64, S = 32, O = 16]
A
4.00
B
2.50
C
0.40
D
0.25
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Correct Option: B
Here's how to calculate the solubility:
1. **Calculate the molar mass of CuSOâ‚„:**
* Cu: 64 g/mol
* S: 32 g/mol
* O: 16 g/mol \* 4 = 64 g/mol
* Molar mass = 64 + 32 + 64 = 160 g/mol
2. **Convert the mass of CuSOâ‚„ to moles:**
* Moles = mass / molar mass
* Moles = 40 g / 160 g/mol = 0.25 mol
3. **Convert the mass of water to volume (assuming the density of water is approximately 1 g/
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