How many moles of sodium chloride are present in a sample that has a mass of $1.17 g$ ?

0.005 m o l

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0.01 m o l

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0.02 m o l

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0.03 m o l

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Solution

The correct option is A $0.02 m o l$
The molar mass of Sodium Chloride $= 23 + 35.5 = 58.5 g$
No. of moles $= \frac{Mass of NaCl}{Molar mass of NaCl} = \frac{1.17}{58.5} = 0.02 m o l e s$

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