Atoms and Molecules
Laws of chemical combination, atomic and molecular masses, mole concept and chemical formulas.
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Take a full mock →Q1 · Atoms and Molecules · MEDIUM
What is the mass of 0.25 moles of calcium carbonate (CaCO₃)? (Atomic masses: Ca = 40, C = 12, O = 16)
Q2 · Atoms and Molecules · EASY
According to the law of conservation of mass, when 12 g of carbon completely burns in oxygen to form carbon dioxide, the mass of oxygen consumed is 32 g. What is the mass of carbon dioxide formed?
Q3 · Atoms and Molecules · EASY
The molecular formula of glucose is C₆H₁₂O₆. What is the molecular mass of glucose? (Atomic masses: C = 12, H = 1, O = 16)
Q4 · Atoms and Molecules · MEDIUM
How many molecules are present in 9 g of water (H₂O)? (Atomic masses: H = 1, O = 16; Avogadro's number = 6.022 × 10²³)
Q5 · Atoms and Molecules · MEDIUM
In a compound, nitrogen and hydrogen combine in the ratio 14:3 by mass. What is the empirical formula of this compound? (Atomic masses: N = 14, H = 1)