What is the mass in grams of 2.2xx10^-3 mol of Sb?

1 Answer
Sep 11, 2016

The mass of $2.2 \times {10}^{- 3} \text{mol Sb}$ is $\text{0.27 g}$.

Explanation:

The mass of one mole (molar mass) of antimony, Sb, is 121.760 g/mol. This is the atomic weight of Sb on the periodic table written as g/mol.

To determine the mass of a substance when you know the moles, multiply the moles by the molar mass of the substance.

$2.2 \times {10}^{- 3} \cancel{\text{mol Sb"xx(121.760"g Sb")/(1cancel"mol Sb")="0.27 g Sb}}$ (rounded to two significant figures)