Verified Answer :

Answer : The correct option is, (B) 0.72 mole of NaCl

Solution : Given,

Mass of NaCl = 42 g

Molar mass of NaCl = 58.44 g/mole

Formula used :

\(\text{Moles of NaCl}=\frac{\text{Mass of NaCl}}{\text{Molar mass of NaCl}}\)

Now put all the given values in this formula, we get the moles of NaCl

\(\text{Moles of NaCl}=\frac{42g}{58.44g/mole}=0.718moles=0.72moles\)

Therefore, the number of moles of NaCl is, 0.72 moles

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