Question

The following questions are about one mole of sulphuric acid (H2 SO4) ?a) Find the number of gram atoms of hydrogen in it? b) How many atoms of hydrogen does it have?c) How many atoms (in grams) of hydrogen are present for every gram atom of oxygen in it? d) Calculate the number of atoms in H2SO4?

Answer 1

Molar Mass of Sulphuric Acid (H₂SO₄​) = 2 x 1 + 32 + 16 x 4 = 98 g mol^-1
(a) mass of hydrogen in Sulphuric Acid = 2 g mol^-1
​(b) atoms of hydrogen 2 x 6.022 x 10²³ = 12.044 x 10²³ atom
(c) mass of Oxygen in Sulphuric Acid = 64 g mol^-1
ie 64 g of oxygen have = 2 g of hydrogen
1 g of oxygen have = (2/64) g of hydrogen = 0.0156g of hydrogen atom

(d) one mole of Sulphuric Acid contains = 6.022 x 10²³ molecules of sulphuric acid
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