Question

What is the mass in milligrams of 4.30 moles of sodium?use âeâ for âÃ10" and use significant figures?

Answer 1

First, calculate the mass of sodium in g with the help of molar mass and number of moles.

Number of moles = $\frac{given mass in g}{molar mass}$   (1)

Molar mass of sodium =$23 .0 g/mol$

Substitute the given value of number of moles and molar mass of sodium in formula (1)

$4.30 moles = \frac{given mass in g}{23.0 g/mol}$   (1)

$4.30 moles\times 23.0 g/mol = mass in g$   (1)

mass of sodium in g = $98.9 g$

Now, according to conversion factor, 1 g = 1000 mg

So, $98.9 g$ of sodium = $98.9 \times 1000 mg$

= $98900 mg$ of sodium

Thus, mass of sodium in mg  =$9.89 \times 10^{4} mg$