Question

2.478 g of white phosphorus was used to make phosphine according to the equation: P₄(s) + 3OH⁻(aq) + 3H₂O(l) → PH₃(g) + 3H₂PO₂⁻(aq) Calculate the amount, in mol, of white phosphorus

Answer 1

Answer: The amount of white phosphorus is 0.0199 moles

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Given mass of white phosphorus = 2.478 g

Molar mass of white phosphorus = 124 g/mol

Putting values in above equation, we get:

$\text{Moles of white phosphorus}=\frac{2.478g}{124g/mol}=0.0199mol$

Hence, the amount of white phosphorus is 0.0199 moles