Respuesta :

jnb2402

N(number of moles)=mass/molar mass

10.5=mass

Na=23 (rounded)

Cl=36 (rounded)

Add it together to get the molar mass

=59

Then refer back to the formula

10.5/59

=0.17796

Round that answer

=0.18 mol

Answer : The correct option is, 0.180 mole

Explanation : Given,

Mass of NaCl = 10.5 g

Molar mass of NaCl = 58.5 g/mole

Formula used :

[tex]\text{Moles of NaCl}=\frac{\text{Mass of NaCl}}{\text{Molar mass of NaCl}}[/tex]

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

[tex]\text{Moles of NaCl}=\frac{10.5g}{58.5g/mole}[/tex]

[tex]\text{Moles of NaCl}=0.179mole=0.180mole[/tex]

Therefore, the number of moles of NaCl is, 0.180 mole

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