Question

14.

Consider the following balanced chemical equation:
P205
3 H2O → 2 H3PO4
Calculate the mass of hydrogen phosphate, H3PO, that will be produced from 105.9 g of P,Os.

Answer 1

Mass = 72.52 g

Step-by-step explanation:

Given data:

Mass of hydrogen phosphate produced = ?

Mass of P₂O₅ react = 105.9 g

Solution:

Chemical equation:

P₂O₅ + 3H₂O → 2H₃PO₄

Number of moles of P₂O₅:

Number of moles = mass/molar mass

Molar mass of P₂O₅ 283.9 g/mol

Number of moles = 105.9 g/ 283.9 g/mol

Number of moles = 0.37 mol

Now we will compare the moles of P₂O₅ with H₃PO₄ from balance chemical equation.

P₂O₅ : H₃PO₄

1 : 2

0.37 : 2/1×0.37= 0.74 mol

Mass of H₃PO₄ :

Mass = number of moles × molar mass

Mass = 0.74 mol × 98 g/mol

Mass = 72.52 g