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

Study Guide - Practice Questions