Mole Concept and Avogadro Constant
Chemistry ⇒ Stoichiometry and Chemical Calculations
Mole Concept and Avogadro Constant starts at 9 and continues till grade 12.
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State Avogadro's hypothesis.
What is the value of Avogadro's constant?
Avogadro's constant is used to relate which two quantities? (1) Mass and volume (2) Number of particles and amount in moles (3) Temperature and pressure (4) Concentration and volume
Which of the following best defines a mole? (1) The mass of a substance (2) The number of particles equal to Avogadro's constant (3) The volume of a gas (4) The number of atoms in 1 gram of hydrogen
Which of the following has the greatest number of atoms? (1) 1 mole of H2 (2) 1 mole of O2 (3) 1 mole of Na (4) 1 mole of CO2
Which of the following has the smallest number of molecules? (1) 1 mole of H2O (2) 0.5 mole of CO2 (3) 2 moles of O2 (4) 0.25 mole of NH3)
Which of the following is NOT a correct use of Avogadro's constant? (1) To convert moles to number of particles (2) To convert grams to moles (3) To convert number of particles to moles (4) To count atoms in a sample
Which of the following is NOT equal to 1 mole? (1) 6.022 × 1023 molecules (2) 22.4 L of a gas at STP (3) 1 g of hydrogen atoms (4) 12 g of carbon-12
Which of the following is the correct definition of molar mass? (1) The mass of 1 atom (2) The mass of 1 mole of a substance (3) The mass of 1 molecule (4) The mass of 1 liter of a substance
Which of the following is the correct formula to calculate the number of particles? (1) Number of particles = number of moles × Avogadro's constant (2) Number of particles = mass / molar mass (3) Number of particles = molar mass / mass (4) Number of particles = number of moles / Avogadro's constant
Fill in the blank: 1 mole of magnesium (Mg) contains ________ atoms.
Fill in the blank: 1 mole of O2 contains ________ molecules.
Fill in the blank: The molar mass of H2SO4 is ________ g/mol.
Fill in the blank: The molar mass of NaCl is ________ g/mol.
True or False: 1 mole of any element contains the same number of atoms.
True or False: 1 mole of oxygen molecules (O2) contains 2 × 6.022 × 1023 atoms.
True or False: The Avogadro constant is a dimensionless number.
True or False: The molar mass of a compound is the sum of the atomic masses of all atoms in its formula.
True or False: The mole is a SI base unit for amount of substance.
True or False: The number of moles can be calculated by dividing the number of particles by Avogadro's constant.
