Question

Convert 4.86 x 104g of Mg to moles.

Answer 1

Answer : The moles of magnesium (Mg) is, $1.99\times 10^3moles$

Solution : Given,

Mass of magnesium (Mg) = $4.86\times 10^4g$

Molar mass of magnesium (Mg) = 24.31 g/mole

Formula used :

$\text{Moles of Mg}=\frac{\text{Mass of Mg}}{\text{Molar mass of Mg}}=\frac{4.86\times 10^4g}{24.31g/mole}=1.99\times 10^3moles$

Therefore, the moles of magnesium (Mg) is, $1.99\times 10^3moles$

Answer 2

Explanation:

Number of moles equal to the given mass divided by molar mass of the element or compound.

Mathematically,       No. of moles = $\frac{mass given}{Molar mass}$

The given mass is $4.86 \times 10^{4}$ g and molar mass is 24.30 g/mol.

Therefore, calculate the number of moles as follows.

          No. of moles = $\frac{mass given}{Molar mass}$

                                = $\frac{4.86 \times 10^{4} g}{24.30 g/mol}$

                                = $0.2 \times 10^{4}$ mol

                                = $2 \times 10^{3}$ mol

or,                             = 2000 mol

Thus, we can conclude that  $4.86 \times 10^{4}$ g of Mg has 2000 moles.