Mole concept, stoichiometry, empirical and molecular formula, limiting reagent.
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Q1 · Some Basic Concepts of Chemistry (Class 11 — ~20% weight) · MEDIUM
A compound contains 40% carbon, 6.67% hydrogen and 53.33% oxygen by mass. If the molecular mass of the compound is 180 g/mol, what is its molecular formula? (Atomic masses: C = 12, H = 1, O = 16)
Q2 · Some Basic Concepts of Chemistry (Class 11 — ~20% weight) · EASY
When 10.0 g of calcium carbonate is heated, it decomposes according to the equation: CaCO3 → CaO + CO2. What mass of calcium oxide is produced? (Atomic masses: Ca = 40, C = 12, O = 16)
Q3 · Some Basic Concepts of Chemistry (Class 11 — ~20% weight) · HARD
In a reaction, 5.4 g of aluminium reacts with 32.0 g of oxygen to form aluminium oxide according to the equation: 4Al + 3O2 → 2Al2O3. What is the mass of aluminium oxide formed? (Atomic masses: Al = 27, O = 16)
Q4 · Some Basic Concepts of Chemistry (Class 11 — ~20% weight) · EASY
How many moles of oxygen atoms are present in 0.5 moles of calcium carbonate (CaCO₃)?