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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Explain why the mole is a useful unit in chemistry.
What is the value of Avogadro's constant?
A chemist has 2.5 × 1024 molecules of oxygen gas (O2). Calculate the number of moles of O2 molecules present. (Avogadro constant = 6.022 × 1023 mol−1)
A sample contains 0.75 moles of aluminum atoms. Calculate the number of atoms present in the sample. (Avogadro constant = 6.022 × 1023 mol−1)
Which of the following best defines a mole? (1) The mass of a substance in grams (2) The amount of substance containing as many entities as there are atoms in 12 g of carbon-12 (3) The number of molecules in 1 liter of water (4) The number of protons in a hydrogen atom
Which of the following contains 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 largest mass? (1) 1 mole of hydrogen atoms (2) 1 mole of oxygen atoms (3) 1 mole of carbon atoms (4) 1 mole of sodium atoms
Which of the following is NOT true about the mole? (1) It is a counting unit (2) It is used to measure mass (3) It is used to count atoms, molecules, or ions (4) 1 mole contains Avogadro's number of particles
Fill in the blank: 1 mole of sodium ions (Na+) contains ________ ions.
Fill in the blank: The molar mass of a substance is the mass of ________ of that substance.
Fill in the blank: The number of atoms in 1 mole of carbon-12 is ________.
One mole of any substance contains ________ particles.
True or False: 1 mole of any gas at standard temperature and pressure (STP) occupies 22.4 liters.
True or False: The Avogadro constant is used to convert between the number of particles and the amount in moles.
True or False: The mole is a SI base unit for the amount of substance.
True or False: The number of moles = mass of substance (g) / molar mass (g/mol).
