Question

Find the number of moles of 49.0 grams of H3PO4

Answer 1

Given parameters:

Mass of H₃PO₄ = 49g

Unknown:

Number of moles = ?

Solution:

To find the number of moles of a given specie;

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

Molar mass = 3(1) + 31 + 4(16) = 98g/mol

Input the parameters and solve;

Number of moles =
`(49)/(98)` = 0.5mole

The number of moles is 0.5mole