Question

(1) What is 1 u equal to? (2) What is the ratio of between Hydrogen and Oxygen in water by mass? (3) If 12 g of C reacts with 32g of O2, how much of CO2 will be formed? (4) What is the atomicity of Oxygen, Hydrogen ,Nitrogen and Chlorine? (5) Give an example of a triatomic molecule. (6) Convert 12g of O2 gas into moles. (7) Find out the mass of 0.5 mol of CO2. (8) Write the symbol for Calcium ion, nitrate ion, gold, silver, sulphate. (9) Write the formula of ammonium chloride, ammonium sulphate , ammonium carbonate and ammonium nitrate. (10) How many molecules are present in 9g of water? ( At mass of H= 1u, O=16u)

Answer 1

5..ozone. O3
9..NH4Cl. NH4SO3. NH4CO3. NH4N3

Answer 2

Answer: (2) The Ratio of Hydrogen and Oxygen to form Water is 2:1.

Explanation: H2O Hence, 2:1