Atoms and Molecules
Laws of chemical combination, atomic/molecular mass, mole concept.
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Take a full mock →Q1 · Atoms and Molecules · MEDIUM
The molecular mass of calcium carbonate (CaCO3) is to be calculated. Given atomic masses: Ca = 40 u, C = 12 u, O = 16 u. What is the molecular mass of calcium carbonate?
Q2 · Atoms and Molecules · MEDIUM
A student needs to prepare a solution containing 0.5 moles of sodium chloride (NaCl). Given that the molar mass of NaCl is 58.5 g/mol, what mass of sodium chloride should the student weigh out?
Q3 · Atoms and Molecules · HARD
Calculate the number of molecules present in 8.8 g of carbon dioxide (CO₂). [Given: Atomic mass of C = 12 u, O = 16 u, Avogadro's number = 6.022 × 10²³]
Q4 · Atoms and Molecules · MEDIUM
Calculate the number of moles present in 88 g of carbon dioxide (CO₂). (Given: Atomic mass of C = 12 u, O = 16 u)