Question

How many moles are present in 450 grams of sodium phosphide, Na3PNa3P?

a. 450 moles
Selected:b. 99.9 moles
c. 44,995 moles
d. 4.50 moles

Answer 1

4.5moles

Step-by-step explanation:

Given parameters:

Mass of Na₃P = ?

Unknown:

Number of moles = ?

Solution;

The number of moles in a given substance can be derived from the expression below;

Number of moles =
`(mass)/(molar mass)`

Molar mass of Na₃P = 3(23) + 31 = 100g/mol

Number of moles =
`(450)/(100)` = 4.5moles