Laws of chemical combination, mole concept, molar mass, formulae.
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Q1 · Atoms and Molecules · MEDIUM
How many moles of calcium carbonate (CaCO₃) are present in 25 g of it? (Given: Ca=40, C=12, O=16)
Q2 · Atoms and Molecules · MEDIUM
What is the mass of 0.25 moles of calcium carbonate (CaCO₃)? (Atomic masses: Ca = 40, C = 12, O = 16)