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 CaCO3. How many formula units are present?
A sample contains 0.75 moles of SO2. How many molecules are present?
A sample contains 3.01 × 1023 molecules of H2SO4. How many moles of H2SO4 are present?
A sample contains 4.5 g of H2O. How many moles of water are present? (Molar mass = 18 g/mol)
A sample of a compound contains 1.204 × 1024 molecules. How many moles does this represent?
A sample of nitrogen gas (N2) contains 1.5 moles. How many molecules are present?
A student has 0.1 moles of glucose (C6H12O6). How many molecules of glucose does this represent?
Avogadro’s constant is used to relate which two quantities?
Which of the following best defines a mole? (1) The mass of a substance containing 6.02 × 1023 particles (2) The volume of 1 dm3 of a gas at STP (3) The number of atoms in 12 g of carbon-12 (4) The number of molecules in 1 g of hydrogen gas
Which of the following has the greatest number of atoms? (1) 1 mole of H2O (2) 1 mole of O2 (3) 1 mole of Na (4) 1 mole of CO2
Which of the following is NOT a correct use of the mole concept? (1) Counting atoms (2) Measuring mass (3) Measuring temperature (4) Calculating number of molecules
Which of the following is NOT equal to 1 mole? (1) 6.02 × 1023 molecules (2) 22.4 dm3 of a gas at STP (3) 1 g of hydrogen atoms (4) Molar mass in grams
Fill in the blank: 1 mole of any ideal gas occupies __________ dm3 at standard temperature and pressure (STP).
Fill in the blank: The molar mass of CaCO3 is __________ g/mol.
Fill in the blank: The molar mass of water (H2O) is __________ g/mol.
Fill in the blank: The number of atoms in 1 mole of carbon-12 is __________.
True or False: 1 mole of sodium chloride contains 6.02 × 1023 formula units.
True or False: The molar mass of a compound is numerically equal to the mass of one mole of that compound in grams.
True or False: The mole is a SI base unit for amount of substance.
True or False: The number of moles of a substance can be calculated by dividing the given mass by its molar mass.
