$$1.20 \times 10$$^{24}$$ atoms

One mole of any substance contains $$6.022 \times 10$$^{23}$$ elementary entities.

Question 1

Which of the following is the correct formula for iron(III) sulfide, given that iron can form more than one type of cation?

Accepted Answer

$$\mathrm{Fe_2S_3}$$

Question 2

What is the correct name for the compound $$\mathrm{$$MgBr_2$$}$$?

Accepted Answer

Magnesium bromide

Question 3

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{$$CoSO_4$$}$$

Question 4

What is the correct formula for ammonium nitrate?

Accepted Answer

$$\mathrm{NH_4NO_3}$$

Question 5

How many atoms are present in 2.00 moles of sodium ($$\mathrm{Na}$$)?

Accepted Answer

$$1.20 	imes 10$$^{24}$$ atoms

Question 6

Which of the following is the correct name for $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Question 7

A compound is named sulfur dichloride. What is its chemical formula?

Accepted Answer

$$\mathrm{$$SCl_2$$}$$

Question 8

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 9

What is the correct formula for beryllium phosphate?

Accepted Answer

$$\mathrm{Be_3$(PO_4$)_2}$$

Question 10

Which of the following statements about the mole is correct?

Accepted Answer

One mole of any substance contains $$6.022 	imes 10$$^{23}$$ elementary entities.

Question 11

Which of the following is the correct name for $$\mathrm{P_4S_{10}}$$?

Accepted Answer

Tetraphosphorus decasulfide

Question 12

What is the correct formula for chromium(III) fluoride?

Accepted Answer

$$\mathrm{$$CrF_3$$}$$

Question 13

Which of the following compounds is NOT an ionic compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 14

How many moles are in $$3.01 	imes 10$$^{23}$$ atoms of carbon?

Accepted Answer

0.500 moles

Question 15

Which of the following is the correct name for $$\mathrm{N_2O}$$?

Accepted Answer

Dinitrogen monoxide

Question 16

A sample contains $$1.204 	imes 10$$^{24}$$ molecules of water. How many moles of water are present?

Accepted Answer

2.00 moles

Question 17

Which of the following is the correct formula for sodium carbonate?

Accepted Answer

$$\mathrm{Na_2CO_3}$$

Question 18

Which of the following is a correct statement about naming binary molecular compounds?

Accepted Answer

The prefix 'mono-' is omitted for the first element if there is only one atom.

Question 19

Which of the following is the correct formula for lithium sulfide?

Accepted Answer

$$\mathrm{Li_2S}$$

Question 20

Which of the following is the correct name for $$\mathrm{NH_4NO_3}$$?

Accepted Answer

Ammonium nitrate

Naming and Formulas of Ionic and Molecular Compounds; The Mole Concept 09-01-2026

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