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 12

A sample contains 0.1 moles of CaCO_3. How many formula units are present?

A sample contains 0.75 moles of SO_2. How many molecules are present?

A sample contains 3.01 \times 10^{23} molecules of H_2SO_4. How many moles of H_2SO_4 are present?

A sample contains 4.5 g of H_2O. How many moles of water are present? (Molar mass = 18 g/mol)

A sample of a compound contains 1.204 \times 10^{24} molecules. How many moles does this represent?

A sample of nitrogen gas (N_2) contains 1.5 moles. How many molecules are present?

A student has 0.1 moles of glucose (C_6H_{12}O_6). How many molecules of glucose does this represent?

Avogadro’s constant is used to relate which two quantities?

Calculate the mass of 0.25 moles of NaCl (Molar mass = 58.5 g/mol).

Calculate the number of atoms in 2 moles of magnesium (Mg).

Calculate the number of chloride ions in 0.5 moles of NaCl.

Calculate the number of molecules in 0.5 moles of oxygen gas (O_2).

Calculate the number of moles in 12 g of helium (He). (Molar mass = 4 g/mol)

Calculate the number of oxygen atoms in 2 moles of H_2O.

Explain why the mole is a useful unit in chemistry.

How many atoms are present in 0.25 moles of aluminum (Al)?

How many moles are present in 1.204 \times 10^{24} molecules of CO_2?

How many moles are present in 22 g of CO_2? (Molar mass of CO_2 = 44 g/mol)

If 0.2 moles of a gas occupy 4.48 dm^3 at STP, what is the molar volume of the gas at STP?

If you have 3 moles of NaCl, how many formula units do you have?