# What would be the mass of a sample containing 0.7 mol of pure tungsten?

$\text{0.7 mol W"="130 g W}$
Multiply the given moles tungsten $\left(\text{W}\right)$ by its molar mass.
$\text{Molar mass W"="183.84 g/mol W}$ (periodic table)
$0.7 \cancel{\text{mol W"xx(183.84"g W")/(1cancel"mol W")="130 g W}}$ rounded to 1 significant figure