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Question

# A solution contains 58.5 g of common salt in 360 g of water. Calculate the total number of protons in the solution.

A
21×6.023×1023
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B
22.8×6.023×1023
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C
200×6.023×1023
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D
228×6.023×1023
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Solution

## The correct option is D 228×6.023×102358.5 g of NaCl=58.5 g58.5 g/mol=1 mol of NaCl 360 g of H2O=360 g18 g/mol=20 mol of H2O Number of electrons in 1 formula unit of NaCl=11+17=28e− Number of electrons in 1 molecule of H2O=2+8=10 Number of electrons in 1 mol of NaCl=28×NA Number of electrons in 20 mol of H2O=200×NA So, the total number of electrons in the solution = 228NA

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