Some Basic Concepts in Chemistry
Matter and its nature; Dalton's atomic theory; concept of atom, molecule, element and compound; laws of chemical combination; atomic and molecular masses; mole concept; molar mass; percentage composition; empirical and molecular formulae; chemical equations and stoichiometry.
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Take a full mock →Q1 · Some Basic Concepts in Chemistry · MEDIUM
A compound contains 40% carbon, 6.7% hydrogen and 53.3% oxygen by mass. If the molar mass of the compound is 180 g/mol, what is its molecular formula?
Q2 · Some Basic Concepts in Chemistry · EASY
How many moles of oxygen atoms are present in 0.5 moles of calcium carbonate (CaCO3)?
Q3 · Some Basic Concepts in Chemistry · MEDIUM
When 10 g of a metal M reacts completely with oxygen to form 14 g of metal oxide MO, what is the equivalent weight of the metal? (Atomic mass of O = 16)
Q4 · Some Basic Concepts in Chemistry · HARD
A mixture contains 2 moles of CO2 and 3 moles of O2. What is the mass percentage of oxygen in this mixture? (C = 12, O = 16)
Q5 · Some Basic Concepts in Chemistry · EASY
What is the number of molecules in 11 g of CO2? (C = 12, O = 16, Avogadro's number = 6 × 10^23)