Answer : There are 6.71 moles of H₃PO₄.
Explanation:
The mole of a substance is calculated as
[tex] mole = \frac{Mass(g)}{MolarMass} [/tex]
Let us find the molar mass of H₃PO₄.
Molar mass of H₃PO₄ = 3 x atomic mass of H + atomic mass of P + 4x atomic mass of O
From the periodic table, we have
Atomic mass of H = 1.008 g/mol
Atomic mass of P = 30.973 g/mol
Atomic mass of O = 15.999 g/mol
Molar mass of H₃PO₄ = [tex] 3 \times 1.008 + 30.973 + 4 \times 15.999 = 97.993 g/mol [/tex]
Molar mass of H₃PO₄ is 97.993 g/mol
The mass of H₃PO₄ is given as 658 g.
The moles can be calculated as,
[tex] moles = \frac{658g}{98g/mol} = 6.71 mol [/tex]
There are 6.71 mol in the given amount of H₃PO₄
