Question

How many grams of oxygen are contained in 2.42 x 10³ g of H₂SO₄?

Answer 1

Molar mass of H2SO4,

MM = 2*MM(H) + 1*MM(S) + 4*MM(O)

= 2*1.008 + 1*32.07 + 4*16.0

= 98.086 g/mol

mass(H2SO4)= 2420 g

number of mol of H2SO4,

n = mass of H2SO4/molar mass of H2SO4

=(2420.0 g)/(98.086 g/mol)

= 24.67 mol

This is number of moles of H2SO4

one mole of H2SO4 contains 4 mole of O

So, number of moles of O = 4 * number of moles of H2SO4

= 4 * 24.67

= 98.69

Molar mass of O = 16 g/mol

mass of O,

m = number of mol * molar mass

= 98.69 mol * 16 g/mol

= 1.58*10^3 g

Answer: 1.58*10^3 g