Q: A tablet contains 325 mg of acetylsalicylic acid ($$C_9H_8O_4). $$How many molecules of acetylsalicylic acid are present? (Molar mass = 180.16 g/mol, $$N_A = 6.022 \times 10$$^{23}$$ mol$$^{-1}$$)

$$1.09 \times 10$$^{21}$$ molecules

Question 1

Which of the following statements best describes the difference between a mixture and a compound?

Accepted Answer

A mixture contains elements in any proportion, while a compound contains elements in definite, fixed proportions.

Question 2

Which type of chemical bond involves the transfer of electrons from one atom to another?

Accepted Answer

Ionic bond

Question 3

What is the empirical formula for a compound containing 24.5 g nitrogen and 70.0 g oxygen?

Accepted Answer

$$NO_2$$

Question 4

Which of the following is a molecular compound?

Accepted Answer

CO$$_2$$

Question 5

What is the correct name for the compound $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

Question 6

Which formula represents a compound with a 1:1 ratio of sodium ions to chloride ions?

Accepted Answer

$$NaCl$$

Question 7

Calculate the mass percent of sodium in sodium oxide ($$Na_2O). ($$Atomic masses: Na = 22.99 g/mol, O = 16.00 g/mol)

Accepted Answer

62.0%

Question 8

Which of the following is the correct molecular formula for a compound with an empirical formula of $$CH$$ and a molar mass of 78.11 g/mol? (Atomic masses: C = 12.01 g/mol, H = 1.01 g/mol)

Accepted Answer

$$C_6H_6$$

Question 9

Which of the following ions is a polyatomic ion?

Accepted Answer

$$NO_3$$^-$$

Question 10

What is the correct name for $$Na_2SO_4 \cdot 10H_2O$$?

Accepted Answer

Sodium sulfate decahydrate

Question 11

Which of the following is the correct formula for aluminum oxide?

Accepted Answer

$$Al_2O_3$$

Question 12

A 7.25 mL sample of butane ($$C_4H_{10}) $$has a density of 0.601 g/mL. How many grams of carbon are present in the sample?

Accepted Answer

3.49 g

Question 13

Which of the following acids is an oxyacid?

Accepted Answer

H$$_2SO$_4$$

Question 14

What is the formula mass of glucose ($$C_6H_{12}O_6$)? (Atomic masses: C = 12.01 g/mol, H = 1.01 g/mol, O = 16.00 g/mol)

Accepted Answer

180.16 g/mol

Question 15

Which of the following is the correct name for $$N_2O_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 16

Which of the following is a hydrocarbon containing only single bonds?

Accepted Answer

Propane ($$C_3H_8)$$

Question 17

What is the correct name for $$Cu_2O$$?

Accepted Answer

Copper(I) oxide

Question 18

Which of the following is the correct formula for magnesium nitrate?

Accepted Answer

$$Mg(NO_3$)_2$$

Question 19

A tablet contains 325 mg of acetylsalicylic acid ($$C_9H_8O_4). $$How many molecules of acetylsalicylic acid are present? (Molar mass = 180.16 g/mol, $$N_A = 6.022 	imes 10$$^{23}$$ mol$$^{-1}$$)

Accepted Answer

$$1.09 	imes 10$$^{21}$$ molecules

Question 20

Which of the following is the correct name for $$HNO_2$$?

Accepted Answer

Nitrous acid

Molecules and Compounds: Structure, Bonding, and Formulas

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