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.

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