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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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.
State Avogadro’s law.
What is the value of Avogadro's constant?
Context: A chemist has 0.75 mol of glucose (C6H12O6). How many oxygen atoms are present in the sample?
Context: A student claims that 1 mole of H2SO4 contains 2 moles of hydrogen atoms, 1 mole of sulfur atoms, and 4 moles of oxygen atoms. Is the student correct?
Context: A chemist needs to prepare 0.25 mol of sodium sulfate (Na2SO4). How many sodium ions will be present in the final solution?
Context: A laboratory experiment requires 2.5 × 1024 molecules of ammonia (NH3). Calculate the mass of ammonia needed for the experiment. (Molar mass of NH3 = 17 g/mol)
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 atoms in 1 g of hydrogen (4) The volume occupied by a gas at STP
Which of the following contains the largest number of atoms? (1) 1 mol of Na (2) 1 mol of H2 (3) 1 mol of O2 (4) All contain the same number of atoms
Which of the following is NOT a use of the mole concept? (1) Calculating the number of atoms in a sample (2) Determining the mass of a substance (3) Measuring temperature (4) Relating the number of particles to mass
Which of the following is the correct definition of molar mass? (1) The mass of one atom of an element (2) The mass of one mole of a substance (3) The number of atoms in one mole (4) The number of molecules in one gram
Fill in the blank: 1 mole of any gas at standard temperature and pressure (STP) occupies __________ L.
Fill in the blank: The molar mass of a substance is numerically equal to its __________ in grams per mole.
Fill in the blank: The number of particles in one mole of a substance is called the __________.
Fill in the blank: The SI unit for the amount of substance is the __________.
Context: A student claims that 1 mole of H2SO4 contains 2 moles of hydrogen atoms, 1 mole of sulfur atoms, and 4 moles of oxygen atoms. Is the student correct?
True or False: One mole of any element contains the same number of atoms as one mole of any other element.
True or False: The Avogadro constant is used to convert between the number of particles and the amount of substance in moles.
True or False: The mass of one mole of carbon-12 is exactly 12 grams.
