Q: A 325 mg tablet of acetylsalicylic acid ($$\mathrm{C_9H_8O_4}) $$contains how many moles of acetylsalicylic acid? (Molar mass = $$180.16\ \mathrm{g\ $$mol^{-1}$$})$$

$$1.80 \times 10$$^{-3}$$\ \mathrm{mol}$$

Question 1

Which of the following best describes an empirical formula?

Accepted Answer

It gives the relative number of atoms of each element in a compound.

Question 2

Which compound is correctly named according to IUPAC rules?

Accepted Answer

FeCl$$_3$$: iron(III) chloride

Question 3

A sample of water is decomposed to yield 2.02 g of hydrogen and 16.00 g of oxygen. What is the empirical formula of water?

Accepted Answer

$$\mathrm{H_2O}$$

Question 4

Which of the following is a correct formula for a compound containing the ammonium ion and sulfate ion?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 5

What is the molar mass of calcium carbonate ($$\mathrm{$$CaCO_3$$}$$)? (Atomic masses: Ca = 40.08 u, C = 12.01 u, O = 16.00 u)

Accepted Answer

$$100.09\ \mathrm{g\ $$mol^{-1}$$}$$

Question 6

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 7

A 325 mg tablet of acetylsalicylic acid ($$\mathrm{C_9H_8O_4}) $$contains how many moles of acetylsalicylic acid? (Molar mass = $$180.16\ \mathrm{g\ $$mol^{-1}$$})$$

Accepted Answer

$$1.80 	imes 10$$^{-3}$$\ \mathrm{mol}$$

Question 8

Which of the following is the correct formula for copper(II) sulfate pentahydrate?

Accepted Answer

$$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$

Question 9

A compound is found to contain 40.00% carbon, 6.71% hydrogen, and 53.29% oxygen by mass. What is its empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 10

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 11

How many moles of chlorine atoms are present in 25.0 g of $$\mathrm{CCl_2F_2}$$? (Molar mass = $$120.91\ \mathrm{g\ $$mol^{-1}$$})$$

Accepted Answer

$$0.207\ \mathrm{mol}$$

Question 12

Which of the following is a correct IUPAC name for an organic compound?

Accepted Answer

2-methylpentane

Question 13

What is the correct name for the compound $$\mathrm{CH_3CH_2CH_2COOH}$$?

Accepted Answer

Butanoic acid

Question 14

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

Accepted Answer

$$\mathrm{K_2CO_3}$$

Question 15

A hydrocarbon with the formula $$\mathrm{C_5H_{10}} is $$most likely a(n):

Accepted Answer

Cycloalkane or alkene

Question 16

Which of the following is the correct name for $$\mathrm{$$FeSO_4$$}$$?

Accepted Answer

Iron(II) sulfate

Question 17

A compound has an empirical formula of $$\mathrm{CH_2$}$$ and a molar mass of $$56.1\ \mathrm{g\ $$mol^{-1}$$}. $$What is its molecular formula?

Accepted Answer

$$\mathrm{C_4H_8}$$

Question 18

Which of the following is the correct name for $$\mathrm{C_6H_6}$$?

Accepted Answer

Benzene

Question 19

Which of the following best describes a structural formula?

Accepted Answer

It shows how atoms are connected to each other using bonds.

Molecules, Compounds, and Nomenclature: Study Notes

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