Q: Which of the following correctly represents the sequence of conversion factors needed to determine the number of copper atoms in a given mass of copper, as shown in the Pearson video?

$$\text{g Cu} \to \text{mol Cu} \to \text{Number of Cu atoms}$$

Q: A sample contains $$9.67\ \text{g} of $$gold ($$\text{Au}). $$How many gold atoms are present in the sample? (Molar mass of Au = $$196.97\ \text{g/mol}$$, Avogadro's number = $$6.022 \times 10$$^{23}$$\ \text{atoms/mol})$$

$$2.96 \times 10$$^{22}$$ atoms

Q: Calculate the mass, in grams, of a single iodine atom ($$\text{I}$$, atomic mass $$= 126.90\ \text{g/mol}). $$Use Avogadro's number $$6.022 \times 10$$^{23}$$\ \text{atoms/mol}.$$

$$2.107 \times 10$$^{-22}$$\ \text{g}$$

Q: A sample contains $$3.10\ \text{g} of $$copper ($$\text{Cu}). $$How many copper atoms are present? (Molar mass of Cu = $$63.55\ \text{g/mol}$$, Avogadro's number = $$6.022 \times 10$$^{23}$$\ \text{atoms/mol})$$

$$2.94 \times 10$$^{22}$$ atoms

Q: Which of the following is the correct conceptual plan for finding the mass of a single carbon atom?

$$1\ \text{C atom} \to \text{mol C} \to \text{g C}$$

Q: Which of the following best describes the process for converting from the number of atoms to mass in grams?

Atoms $$\to$$ moles $$\to$$ grams

Question 1

Which of the following correctly represents the sequence of conversion factors needed to determine the number of copper atoms in a given mass of copper, as shown in the Pearson video?

Accepted Answer

$$	ext{g Cu} 	o 	ext{mol Cu} 	o 	ext{Number of Cu atoms}$$

Question 2

A sample contains $$9.67\ 	ext{g} of $$gold ($$	ext{Au}). $$How many gold atoms are present in the sample? (Molar mass of Au = $$196.97\ 	ext{g/mol}$$, Avogadro's number = $$6.022 	imes 10$$^{23}$$\ 	ext{atoms/mol})$$

Accepted Answer

$$2.96 	imes 10$$^{22}$$ atoms

Question 3

What is the mass in grams of $$4.81 	imes 10$$^{22}$$ atoms of lead ($$	ext{Pb}$$)? (Molar mass of Pb = 207.2$$\ 	ext{g/mol}$$, Avogadro's number = 6.022$$ 	imes $$10^{23}$$\ 	ext{atoms/mol}$$)

Accepted Answer

$$16.5\ 	ext{g}$$

Question 4

Calculate the mass, in grams, of a single iodine atom ($$	ext{I}$$, atomic mass $$= 126.90\ 	ext{g/mol}). $$Use Avogadro's number $$6.022 	imes 10$$^{23}$$\ 	ext{atoms/mol}.$$

Accepted Answer

$$2.107 	imes 10$$^{-22}$$\ 	ext{g}$$

Question 5

Which of the following best describes the difference between ionic and covalent bonding?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between two nonmetals.

Question 6

Which of the following compounds would you expect to be a molecule rather than part of an ionic solid?

Accepted Answer

$$	ext{CO}_2$$

Question 7

A sample contains $$3.10\ 	ext{g} of $$copper ($$	ext{Cu}). $$How many copper atoms are present? (Molar mass of Cu = $$63.55\ 	ext{g/mol}$$, Avogadro's number = $$6.022 	imes 10$$^{23}$$\ 	ext{atoms/mol})$$

Accepted Answer

$$2.94 	imes 10$$^{22}$$ atoms

Question 8

Which of the following is the correct conceptual plan for finding the mass of a single carbon atom?

Accepted Answer

$$1\ 	ext{C atom} 	o 	ext{mol C} 	o 	ext{g C}$$

Question 9

If you have $$1.00\ 	ext{mol} of $$sodium chloride ($$	ext{NaCl}$$), how many formula units of $$	ext{NaCl} do $$you have?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 10

Which of the following best explains why ionic compounds are not considered molecular?

Accepted Answer

Ionic compounds form large macroscopic lattices of ions, not discrete molecules.

Question 11

A chemist needs $$2.00 	imes 10$$^{24}$$ atoms of silver ($$	ext{Ag}$$) for an experiment. What mass of silver should be weighed out? (Molar mass of Ag = 107.87$$\ 	ext{g/mol}$$, Avogadro's number = 6.022$$ 	imes $$10^{23}$$\ 	ext{atoms/mol}$$)

Accepted Answer

$$358\ 	ext{g}$$

Question 12

Which of the following is a correct application of Avogadro's number?

Accepted Answer

Converting moles of a substance to number of atoms.

Question 13

Which of the following best describes the process for converting from the number of atoms to mass in grams?

Accepted Answer

Atoms $$	o$$ moles $$	o$$ grams

Question 14

Which of the following is a real-world application of the mole concept?

Accepted Answer

Determining the number of molecules in a dose of medication.

Study Guide: Mass, Moles, and Atoms in General Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard