WAEC Chemistry 2025 Theory — Question 1

Question 1 of 70 from the West African Examinations Council (WAEC) Chemistry 2025 Theory paper, with the correct answer and a full explanation.

1(a). How many moles are there in 4.8g of ozone (O3)? [O = 16]

Model answer

Molar mass of O3 = 16 x 3 = 48 g/mol. Number of moles = mass/molar mass = 4.8/48 = 0.1 mole.

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