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 =
`(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 = (given mass in g)/(23.0 g/mol)` (1)

`4.30 moles* 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 * 1000  mg`

=
`98900 mg` of sodium

Thus, mass of sodium in mg =
`9.89 * 10^(4) mg`