Question 1

Which of the following is the correct formula for the compound formed between magnesium and phosphate ions?

Accepted Answer

$$\mathrm{Mg_3$(PO_4$)_2}$$

Question 2

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 3

Calculate the number of moles in $$18.0\ \mathrm{g} of $$water ($$\mathrm{H_2O}$$). $$(\mathrm{H} = 1.0,\ \mathrm{O} = 16.0)$$

Accepted Answer

$$1.0\ \mathrm{mol}$$

Question 4

Which of the following ions has a $$2+$$ charge?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$}$$

Question 5

What is the empirical formula for a compound containing $$40\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 6

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{$$KNO_3$$}$$

Question 7

How many formula units are present in $$0.25\ \mathrm{mol} of$$ $$\mathrm{NaCl}$$? $$(\mathrm{N_A} = 6.022 	imes 10$$^{23}$$)$$

Accepted Answer

$$1.51 	imes 10$$^{23}$$

Question 8

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

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 9

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of $$\mathrm{$$CO_2$$}$$. What is the mass of the sample? $$(\mathrm{C} = 12.0,\ \mathrm{O} = 16.0)$$

Accepted Answer

$$11.0\ \mathrm{g}$$

Question 10

Which of the following is the correct name for $$\mathrm{K_2SO_4}$$?

Accepted Answer

Potassium sulfate

Question 11

What is the molar mass of $$\mathrm{Mg(OH)_2}$$? $$(\mathrm{Mg} = 24.3,\ \mathrm{O} = 16.0,\ \mathrm{H} = 1.0)$$

Accepted Answer

$$58.3\ \mathrm{g\ $$mol^{-1}$$}$$

Question 12

Which of the following is the correct formula for ammonium phosphate?

Accepted Answer

$$\mathrm{(NH_4$)_3PO_4}$$

Question 13

How many oxygen atoms are present in $$2.0\ \mathrm{mol} of$$ $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$4.8 	imes 10$$^{24}$$

Question 14

Which of the following is the correct name for $$\mathrm{Na_2CO_3}$$?

Accepted Answer

Sodium carbonate

Question 15

A compound contains $$27.3\%$$ carbon and $$72.7\%$$ oxygen by mass. What is its empirical formula? $$(\mathrm{C} = 12.0,\ \mathrm{O} = 16.0)$$

Accepted Answer

$$\mathrm{CO_2$}$$

Question 16

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

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 17

How many moles of $$\mathrm{O_2$}$$ are present in $$32.0\ \mathrm{g} of $$oxygen gas? $$(\mathrm{O} = 16.0)$$

Accepted Answer

$$1.0\ \mathrm{mol}$$

Question 18

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

Accepted Answer

Sulfuric acid

Question 19

What is the formula mass of $$\mathrm{K_2SO_4}$$? $$(\mathrm{K} = 39.1,\ \mathrm{S} = 32.1,\ \mathrm{O} = 16.0)$$

Accepted Answer

$$174.3\ \mathrm{g\ $$mol^{-1}$$}$$

Question 20

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

Accepted Answer

$$\mathrm{$$CuSO_4$$}$$

Writing and Predicting Chemical Formulas, Stoichiometry, and Nomenclature: Study Notes for Introductory Chemistry

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