Answer : The number of moles present in 10.5 grams of NaCl are, 0.179 moles.
Solution : Given,
Mass of NaCl = 10.5 g
Molar mass NaCl = 58.5 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
\(\text{Moles of NaCl}=\frac{10.5g}{58.5g/mole}=0.179moles\)
Therefore, the number of moles present in 10.5 grams of NaCl are, 0.179 moles.