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Mole Concept and Avogadro Constant

Chemistry ⇒ Stoichiometry and Chemical Calculations

Mole Concept and Avogadro Constant starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Mole Concept and Avogadro Constant. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 11
A sample contains 1.204 × 1024 atoms of magnesium. How many moles of magnesium are present?
A sample contains 4.5 × 1024 molecules of a gas. How many moles of the gas are present?
A sample of a compound contains 6.022 × 1023 molecules. What is the amount of substance in moles?
Calculate the number of formula units in 0.05 mol of Na2SO4.
Calculate the number of molecules in 0.5 mol of water (H2O).
Calculate the number of sodium ions in 0.25 mol of NaCl.
Context: A chemist has 0.75 mol of glucose (C6H12O6). How many oxygen atoms are present in the sample?
Describe the relationship between Avogadro’s constant and the mole.
Explain why the mole is considered a bridge between the atomic and macroscopic worlds in chemistry.
How many atoms are present in 2 moles of oxygen gas (O2)?
How many atoms are present in 3 moles of aluminum (Al)?
How many chloride ions are present in 0.1 mol of MgCl2?
How many moles are present in 18 g of water (H2O)? (Molar mass of H2O = 18 g/mol)
If 1 mole of a substance contains 6.022 × 1023 particles, how many particles are in 0.2 moles?
If you have 3.01 × 1023 molecules of CO2, how many moles of CO2 do you have?
State Avogadro’s law.
What is the value of Avogadro's constant?
A sample contains 1.5 moles of nitrogen gas (N2). Calculate the total number of nitrogen atoms present in the sample.
A sample of calcium carbonate (CaCO3) has a mass of 50.0 g. Calculate the number of oxygen atoms present in the sample. (Molar mass of CaCO3 = 100 g/mol)
Context: A chemist needs to prepare 0.25 mol of sodium sulfate (Na2SO4). How many sodium ions will be present in the final solution?