Chemistry

1The molecular formula of a compound with empirical formula CH₂ and molar mass 42 g/mol is

2The molar mass of sodium chloride, NaCl, is ___ g/mol. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64)

3How many molecules are in 2 mol of calcium carbonate? (L = 6.02 × 10²³)

4The molar mass of CaCO₃ is 100 g/mol.

5How many moles are in 200 g of calcium carbonate, CaCO₃?

6How many molecules are in 2 mol of sulphur dioxide? (L = 6.02 × 10²³)

7The molar mass of copper(II) sulphate, CuSO₄, is ___ g/mol. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64)

8How many molecules are in 3 mol of aluminium oxide? (L = 6.02 × 10²³)

9One mole of any gas occupies 22.4 dm³ at room temperature and pressure.

10The molar mass of potassium hydroxide, KOH, is ___ g/mol. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64)