Question

Calculate how many grams of magnesium oxide (Mg0) are in 3.500 moles of magnesium oxide.

Answer 1

144.564 grams

Exlanation

The given moles of MgO = 3.500 moles

The mass in grams of MgO can be calculated using the mole formula.

`Mole=\frac{Mass}{Molar\text{ }mass}`

From the periodic table, the atomic masses of (O = 15.999, Mg = 24.305)

Molar mass of MgO = (24.305 + 15.999) = 40.304 g/mol

Putting mole = 3.500 mol and molar mass = 40.304 g/mol into the mole formulag/mol

`\begin{gathered} 3.500\text{ }mol=\frac{Mass}{40.304\text{ }g\text{/}mol} \\ \\ \Rightarrow Mass=3.500\text{ }mol*40.304\text{ }g\text{/}mol=144.564\text{ }grams \end{gathered}`

Therefore, the grams of magnesium oxide (MgO) that are in 3.500 moles of magnesium oxide = P144.564 grams