Question on: JAMB Chemistry - 2024
127 g of sodium chloride was dissolved in 1.0 dm3 of distilled water at 25°C. Determine the solubility in mol·dm-3 of sodium chloride at that temperature. [Na = 23, Cl = 35.5]
A
1.0
B
2.0
C
2.2
D
4.1
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Correct Option: C
Solution:
- Calculate molar mass of NaCl: Na = 23 g/mol, Cl = 35.5 g/mol, Molar mass = 58.5 g/mol
- Calculate number of moles: Moles = mass / molar mass = 127 / 58.5 ≈ 2.17 mol
- Calculate solubility: Solubility = moles / volume = 2.17 mol / 1.0 dm3 = 2.17 mol·dm-3
- The closest option is 2.2 mol·dm-3
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