Which of the following would weigh most?

(a) 1 mole of H₂O

(b) 1 mole of CO₂

(c) 1 mole of NH₃

(d) 1 mole of CO

Which of the following contains the maximum number of molecules?

(a) 4 g of O₂

(b) 4 g of NH₃

(c) 4 g of CO₂

(d) 4 g of SO₂

Calculate the number of hydrogen atoms in 0.1 mole of H₂SO₄.

Calculate the number of molecules in one kg of calcium chloride.