Chemical Measurements (GCSE Chemistry)

Neon has three isotopes with abundances 90.48% (20), 0.27% (21) and 9.25% (22). What is the relative atomic mass (Ar) of neon (to two decimal places)?

25.00 cm3 of hydrochloric acid is titrated with 23.50 cm3 of 0.100 mol/dm3 barium hydroxide. The reaction is 2HCl + Ba(OH)2 ? BaCl2 + 2H2O. What is the concentration of HCl?

What volume (in dm3) of any gas at room temperature and pressure is produced by 0.500 mol of the gas? (Use 1 mol = 24 dm3)

A dye has Rf = distance dye / distance solvent. If distance dye = 4.8 cm and solvent = 12.0 cm, what is the Rf?

A solution contains 35.2 g/dm3 NaCl. If sodium is 39.3% by mass of NaCl, what is the mass concentration of sodium ions in g/dm3?

If a solution has concentration 35.2 g/dm3 and you take 25.0 cm3 of it, how many grams of solute are in that 25.0 cm3?

For the Haber process: N2 + 3H2 ? 2NH3. What is the atom economy for producing ammonia (mass of desired product ÷ mass of reactants ×100)?

A sample contains 5.80 g of iron (Ar = 58.0). How many moles of iron are present?

Which calculation gives the number of moles of gas in 24.0 dm3 at RTP?

A sodium chloride solution has concentration 35.2 g/dm3. What is the concentration in mol/dm3? (Mr NaCl = 58.5)

What is the molar volume (dm3) of 0.250 mol of gas at room temperature and pressure (1 mol = 24 dm3)?