H. Chemistry Chapter 06 Test Review
Name_______________________
SHOW ALL WORK-#1 has been set-up for you to demonstrate how to properly show work. Circle final answers with
correct units.
1) How many silver atoms are in 0.40 mol of Ag?
0.40 𝑚𝑜𝑙 𝐴𝑔 𝑥
6.022 𝑥 1023 𝑎𝑡𝑜𝑚𝑠
=
1 𝑚𝑜𝑙
2) How many mercury atoms are in 5.8 mol of mercury?
3) How many moles of tin are in a mass of 38.1 grams?
4) What is the mass of 0.12 moles of lead?
5) How many moles of gold are in 1.63 x 1022 atoms of gold?
6) What is the mass of 0.522 mol of copper?
7) How many sugar molecules are in 30.0 g of sugar? The chemical formula for sugar is C12H22O11.
8) How many moles of H are in 0.424 mol Ca(C2H3O2)2?
9) Calculate the mass percent of each element in Na2S2O3.
a. Na
b. S
c. O
10) A compound consists of 25.94% N and 74.06% O by mass. Determine the empirical formula of the compound.
11) A compound is formed with 13.99 g iron and 6.01 g oxygen. What is the empirical formula of the compound?
12) A compound has an empirical formula of CH2 and a molar mass of 84.18 g/mol. Find its molecular formula.
13) Elemental analysis of putrescine indicates it consists of 54.5% C, 13.73% H, and 31.77% N. Calculate the
empirical formula of putrescine. Putrescine is a compound that is produced when an animal carcass
decomposes.
14) Calculate the empirical formula for acetaminophen also known as Tylenol, using the following percentages:
a. 63.56% C
b. 6.00% H
c. 9.27% N
d. 21.17% O
15) Calculate the empirical formula for naproxen also known as Aleve, using the following percentages:
a. 73.03% C
b. 6.13% H
c. 20.84% O
16) A compound containing carbon and hydrogen has a molar mass of 56.11 g/mol and an empirical formula of CH2.
Determine its molecular formula.
17) A compound containing phosphorous and oxygen has a molar mass of 219.9 g/mol and an empirical formula of
P2O3. Determine its molecular formula.
18) Find the molecular formula of the compound that has a molar mass of 284.77 g/mol and an empirical formula of
CCl.
19) Find the molecular formula of the compound that has a molar mass of 131.39 g/mol and an empirical formula of
C2HCl3.
20) Find the molecular formula of the compound that has a molar mass of 181.44 g/mol and an empirical formula of
C2HCl.