What is 20 cm3 in dm3?
0.002 dm3
0.02 dm3
0.2 dm3
2.0 mol of solute is dissolved in 0.50 dm3 of water. What is the concentration of the solution formed in mol/dm3?
0.25
1.0
4.0
What is the concentration of 0.100 mol/dm3 NaOH solution in g/dm3? (Relative formula mass of NaOH = 40.0)
0.0025
4.00
400
25.00 cm3 of sodium hydroxide solution reacts with 20.00 cm3 of 0.100 mol/dm3 hydrochloric acid: NaOH + HCl → NaCl + H2O. What is the concentration of NaOH?
0.125 mol/dm3
0.100 mol/dm3
0.080 mol/dm3
Sodium hydroxide solution reacts with hydrochloric acid: NaOH + HCl → NaCl + H2O. What volume of 0.10 mol/dm3 NaOH will react exactly with 25 cm3 of 0.20 mol/dm3 HCl?
50 cm3
25 cm3
12.5 cm3
Hydrogen and oxygen are produced by the electrolysis of water: 2H2O → 2H2 + O2. If 100 cm3 of hydrogen forms, what volume of oxygen forms?
200 cm3
100 cm3
Which occupies the greatest volume at room temperature and pressure?
0.5 mol of ammonia, NH3
2 mol of argon, Ar
1 mol of oxygen, O2
What is the volume of 0.25 mol of hydrogen, H2, at room temperature and pressure?
0.25 × 2 × 24 = 12 dm3
0.25 × 24 = 6.0 dm3
24/0.25 = 96 dm3
What is the amount, in mol, of helium atoms in 12 dm3 of helium gas, He? (Molar gas volume = 24 dm3)
0.50 mol
1.0 mol
2.0 mol
Calcium carbonate decomposes to form calcium oxide and carbon dioxide: CaCO3(s) → CaO(s) + CO2(g). What volume of carbon dioxide can be produced from 0.5 mol of calcium carbonate. (Molar gas volume = 24 dm3)
48 dm3
24 dm3
12 dm3