WorksheetsChemical quantities - Six weeks review
Total questions: 20
Worksheet time: 38mins
Name
Class
Date
1.
How many hydrogen atoms are in the compound: (NH4)2CO3
a)
3
b)
4
c)
6
d)
8
2.
What is the formula mass of CO2?
a)
44 grams
b)
44 amu
c)
0.44 grams
d)
2.6 x 1025 atoms
3.
Which of the following is an empirical formula?
a)
C3H3
b)
Li2CO3
c)
Na2O2
d)
C6H12O6
4.
How many moles are contained in 45 grams of aluminum?
a)
27 mol
b)
1215 mol
c)
1.7 mol
d)
57 mol
5.
How many moles of chlorine gas are contained in 45 grams of pure sample?
a)
35 mol
b)
0.64 mol
c)
1.3 mol
d)
2.6 mol
6.
How many atoms of are contained in a mole of sodium?
a)
6.02 x 1023 atoms
b)
11 atoms
c)
23 atoms
d)
2 atoms
7.
How many moles are in 16.94g of water?
a)
16.94 mol H2O
b)
0.9401 mol H2O
c)
305.3 mol H2O
d)
1.063 mol H2O
8.
A container with a volume of 893 L contains how many moles of air at STP?
a)
20003.2 L
b)
39.9 L
c)
22.4 L
d)
none of the choices
9.
What is the percent composition of Benzene, C6H6?
a)
C = 50%
H = 50%
H = 50%
b)
C = 85.7 %
H = 14.3%
H = 14.3%
c)
C = 92.2%
H = 7.8%
H = 7.8%
d)
C = 71.9%
H = 28.1%
H = 28.1%
10.
If 45.0 g of Mg react with 19.5 g of oxygen, what is the % of magnesium in the resulting compound?
a)
69.8%
b)
30.2%
c)
43.3%
d)
12.9%
11.
A container with a volume of 893 L contains how many moles of air at STP?
a)
20003.2 L
b)
39.9 L
c)
22.4 L
d)
none of the choices
12.
A chemical reaction produces 0.37 mol of N2 gas. What volume will that gas occupy at STP?
a)
0.02 L
b)
10.4 L
c)
5.2 L
d)
8.3 L
13.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
14.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula
d)
Distance Formula
15.
How many grams are in 3.3 mol of Potassium Sulfide ( K2S ) ?
a)
360 g
b)
454 g
c)
238 g
d)
132 g
16.
How many grams of Hydrogen are there in 25 moles of H2O ?
a)
25 g
b)
450 g
c)
18 g
d)
50 g
17.
The number 6.02 x 1023, which is the number of particles found in a mole.
a)
molar mass
b)
mole
c)
Avogadro's number
d)
hydrate
18.
How many molecules are in 9.44 moles of AlCl3?
a)
5.68 molec AlCl3
b)
5.68x1024 molec AlCl3
c)
0.705 molec AlCl3
d)
1.25x1023 molec AlCl3
19.
What is the molar mass of Ca(NO3)2?
a)
148.096 g
b)
164.086 g
c)
102.055 g
d)
70.084 g
20.
Determine how many grams are in 0.36 moles of CCl4.
a)
150 g
b)
55 g
c)
0.0023 g
d)
2.2 g
100 %
