Question

The number of moles present in 155 g of phosphorous is

• A. 0.2
• B. 0.01
• C. 5
• D. 10

Answer 1

The correct option is C

5

Given mass of phosphorous = 155 g
Gram atomic mass of phosphorous = 31 g

We know that, number of mole
= $\frac{\text{Mass in grams}}{\text{Gram atomic mass of the element}}$
$\therefore$ Number of moles present in 155 grams of phosphorous
= $\frac{155}{31}$ = 5 mol