Question

calculate the number of moles in 10.5 g of sodium​

Answer 1

Explanation:

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}}Moles of NaCl=

Molar mass of NaCl

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}=0.179molesMoles of NaCl=

58.5g/mole

10.5g

=0.179moles

Therefore, the number of moles present in 10.5 grams of NaCl are, 0.179 moles.

Answer 2

Answer:

There are 0.46 moles of sodium in 10.5 g of Sodium

Explanation:

Atomic mass of sodium= 23gm

Given mass of Na=10.5gm

So no. of moles =Given mass/Molar mass= 10.5/23

                                                                     =0.46 moles approx.