Question 1

Which of the following is the correct empirical formula for mercury(II) oxalate?

Accepted Answer

$$\mathrm{HgC_2O_4}$$

Question 2

What is the correct formula for cobalt(II) phosphate?

Accepted Answer

$$\mathrm{Co_3$(PO_4$)_2}$$

Question 3

Which of the following is the correct name for $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 4

What is the correct formula for ammonium sulfate?

Accepted Answer

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

Question 5

A compound is formed between sodium and nitrate. What is its chemical formula?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 6

How many moles of glucose ($$\mathrm{C_6H_{12}O_6$}) $$are present in a sample containing 31.80 g of glucose?

Accepted Answer

$$0.177$$ moles

Question 7

How many moles of sodium are in 1.60 moles of sodium phosphate ($$\mathrm{Na_3PO_4}$$)?

Accepted Answer

$$4.80$$ moles

Question 8

A sample contains 7.33 moles of sulfuric acid ($$\mathrm{H_2SO_4}). $$How many moles of $$\mathrm{H^+}$$ and $$\mathrm{SO_4$^{2-}}$$ ions are present?

Accepted Answer

$$14.66$$ moles $$\mathrm{H^+}$$, $$7.33$$ moles $$\mathrm{SO_4$^{2-}}$$

Question 9

How many molecules of $$\mathrm{H_2C_2O_4}$$ are present in $$76.8 g of$$ $$\mathrm{H_2C_2O_4}$$? (Molar mass = $$90.04 g/$$mol)

Accepted Answer

$$8.19 	imes 10$$^{23}$$

Question 10

What is the mass (in kg) of $$6.89 	imes 10$$^{25}$$ molecules of $$\mathrm{$$CO_2$$}$$? (Molar mass = 44.01$ g/mol)

Accepted Answer

$$504 kg$$

Question 11

Calculate the mass percent composition of sulfur in $$\mathrm{Ag_2SO_4}.$$

Accepted Answer

$$18.1\%$$

Question 12

Calculate the mass percent composition of lithium in $$\mathrm{Li_3PO_4}.$$

Accepted Answer

$$17.8\%$$

Question 13

How many atoms of oxygen are contained in $$67.4 g of$$ $$\mathrm{Al_2$(CO_3$)_3}$$? (Molar mass = $$233.99 g/$$mol)

Accepted Answer

$$2.09 	imes 10$$^{24}$$

Question 14

A compound has a molar mass of $$122.11 g/$$mol and contains $$36.86\% C $$and $$6.16\% H by $$mass. What is its empirical formula?

Accepted Answer

$$\mathrm{C_2H_4O}$$

Question 15

A molecule contains $$2.477 g of $$borium and $$1.115 g of $$selenium. What is the empirical formula?

Accepted Answer

$$\mathrm{B_2Se_3}$$

Question 16

Which of the following compounds would have the highest melting point according to the type of bonding present?

Accepted Answer

$$\mathrm{NaCl}$$

Question 17

Which of the following is a molecular compound?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 18

Which of the following is NOT a molecular compound?

Accepted Answer

$$\mathrm{NaCl}$$

Chapter 4: Chemical Quantities & Aqueous Reactions – Study Notes and Practice Questions

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