# What is the mass of 0.175 moles of phosphorus?

Mass of $0.175$ moles of $P$ is $5.425 g r a m s .$
The average mass of one mole of Phosphorus $\left(P\right)$ $= 31 g r a m s .$
$\therefore$ Mass of $0.175$ moles of $P$ $=$(Molar mass)$\times$(No. of moles).
$\therefore$ Mass of $0.175$ moles of $P$ $= \left(31 g\right) \times \left(0.175\right) = 5.425 g r a m s .$ (answer)