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Q.

The molecular mass of common salt (NaCl) is 58.5 u. The atomic mass of sodium is 23. Find the atomic mass of chlorine.

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a

40u

b

35.5 u

c

42u

d

35 u

answer is C.

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Detailed Solution

Molecular mass of sodium chloride =  1X atomic mass of sodium + 1 X atomic mass of chlorine

  58.5 =  1X 23 + atomic mass of chlorine

 58.5 = 23 + atomic mass of chlorine

Atomic mass of chlorine = 58.5 - 23 = 35.5u

Atomic mass of chlorine is 35.5 u

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The molecular mass of common salt (NaCl) is 58.5 u. The atomic mass of sodium is 23. Find the atomic mass of chlorine.