BackMole Concept quiz #10
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BackHow many moles of pyridine (C5H5N) are contained in 3.13 g of pyridine?
3.13 g ÷ 79.10 g/mol ≈ 0.0396 moles. How many atoms are in 14 moles of cadmium?
14 × 6.022×10^23 = 8.43×10^24 atoms. How many moles are in 15 grams of lithium?
15 g ÷ 6.94 g/mol ≈ 2.16 moles. How many moles are in 22 grams of argon?
22 g ÷ 39.95 g/mol ≈ 0.551 moles. Which statement best describes a mole?
A mole is a counting unit equal to 6.022×10^23 particles. The number of carbon atoms in exactly 12 g of pure carbon-12 is called a
Mole (Avogadro's number). What is the difference between an atom and an ion?
An atom is a single element with no charge, while an ion is a single element that possesses a positive or negative charge. Why is the term 'molecules' used when referring to chlorine gas (Cl2) instead of 'atoms' or 'formula units'?
The term 'molecules' is used because Cl2 consists of two nonmetals bonded together; 'atoms' would refer to single chlorine atoms, and 'formula units' are used for compounds with metals and nonmetals. How is the molar mass of chlorine gas (Cl2) calculated using the periodic table?
The molar mass of Cl2 is found by multiplying the atomic mass of chlorine (35.45 g/mol) by 2, resulting in 70.90 g/mol. What general term can be used to refer collectively to atoms, ions, molecules, and formula units when discussing the mole concept?
The term 'particles' is used to collectively refer to atoms, ions, molecules, and formula units in the context of the mole concept. What is the formal definition of a mole in chemistry?
A mole is the amount of substance containing the same number of entities as there are atoms in 12 grams of carbon-12. How many particles are present in one mole of any substance?
One mole contains 6.022 × 10^23 particles, which is Avogadro's number. What does Avogadro's number represent?
Avogadro's number (6.022 × 10^23) represents the number of particles (atoms, molecules, ions, or formula units) in one mole of a substance. How many atoms are in one mole of silver?
One mole of silver contains 6.022 × 10^23 atoms. How many atoms are in one mole of carbon?
One mole of carbon contains 6.022 × 10^23 atoms. How many atoms are in one mole of gold?
One mole of gold contains 6.022 × 10^23 atoms. How many atoms are in one mole of copper?
One mole of copper contains 6.022 × 10^23 atoms. How many atoms of potassium are in one mole?
One mole of potassium contains 6.022 × 10^23 atoms. How many atoms of iodine are in one mole of iodine?
One mole of iodine contains 6.022 × 10^23 atoms. How many carbon atoms are in one mole of carbon?
One mole of carbon contains 6.022 × 10^23 carbon atoms. How many particles are in one mole of carbon?
One mole of carbon contains 6.022 × 10^23 particles (atoms). How many moles of chlorine are present in one mole of CaCl2?
One mole of CaCl2 contains two moles of chlorine atoms. How many molecules are in 0.500 mole of N2O5?
0.500 mole of N2O5 contains 0.500 × 6.022 × 10^23 = 3.011 × 10^23 molecules. How many atoms are present in 0.25 mole of magnesium?
0.25 mole of magnesium contains 0.25 × 6.022 × 10^23 = 1.506 × 10^23 atoms. For a compound, how do you determine the mass of a given number of moles?
Multiply the number of moles by the molar mass of the compound to get the mass. If 0.256 mole of a compound weighs 12.8 g, how do you find its molar mass?
Divide the mass (12.8 g) by the number of moles (0.256) to get the molar mass: molar mass = 12.8 g / 0.256 mol = 50 g/mol. What quantity is equal to one mole of gold (Au)?
One mole of gold is equal to 6.022 × 10^23 atoms of gold. Which sample contains a mole of atoms?
Any sample containing 6.022 × 10^23 atoms of an element contains one mole of atoms. What does a mole represent in chemistry?
A mole represents a specific quantity of substance containing 6.022 × 10^23 particles, such as atoms, molecules, ions, or formula units.
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