Relative formula mass and the moleIB MYP Chemistry: Mind map

Exam questions on Relative formula mass and the mole

1. A cement works in Turkey heats limestone, which is mostly calcium carbonate, CaCO₃. A chemist at the works calculates the amounts of substances being used. Relative atomic masses: Ca = 40, C = 12, O = 16.
   Calculate the mass of 3.0 mol of calcium carbonate.2 marks
2. A sports drink company in Australia lists glucose, C₆H₁₂O₆, as an ingredient and also uses large amounts of water, H₂O. Chemists count particles in moles. The Avogadro constant is 6.02 × 10²³ per mole. Relative atomic masses: H = 1, C = 12, O = 16.
   Calculate the relative formula mass (Mr) of glucose.2 marks
3. A teacher gives students samples of four substances and asks them to weigh out one mole of each. The students record the mass of one mole: water, H₂O, 18 g; sodium chloride, NaCl, 58.5 g; magnesium oxide, MgO, 40 g; calcium carbonate, CaCO₃, 100 g. Relative atomic masses: H = 1, C = 12, O = 16, Na = 23, Mg = 24, Cl = 35.5, Ca = 40.
   Describe the pattern in the data, verify it using one of the substances, and state a general rule.3 marks