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WorksheetsChemical Quantities
Total questions: 40
Worksheet time: 20mins
1 mol = 6.02 x 1023 _______
particles
grams
liters
Kelvin
1 mol of gas at STP will occupy ___ of space.
6.02 L
22.4 L
10.23 L
12.01 L
The molar volume only works under STP conditions, which are...
0°C and 1 atm
0°C and 100 atm
100°C and 1 atm
100°C and 100 atm
The molar mass of a substance can be found by...
adding up the masses listed on the periodic table
dividing by Avogadro's number
multiplying by 22.4
multiplying by Avogadro's number
Determine the empirical formula of C6H12
C3H6
C12H24
CH
CH2
Molarity =
mol / L
mol / kg
g / mol
L / kg
Molality =
mol / L
mol / kg
g / mol
L / kg
What formula can be used to solve for the new molarity after a dilution?
M2 = M1 V1 / V2
M2 = M1 V2 / V1
M2 = V1 V2 / M1
M2 = V1 M1 V2
Which of these would dilute a solution?
adding more solute
adding more water
pouring some of it in a new container
How many moles are present if there are 8.88 x 1023 particles?
1.48 mol
2.99 mol
0.71 mol
36.5 mol
What would be the representative particle of H2O?
atoms
molecules
formula units
What would be the representative particle of Cu?
atoms
molecules
formula units
What would be the representative particle of NaCl?
atoms
molecules
formula units
How many particles are in 5.2 mol of Ag?
3.1 x 1024
2.7 x 1023
1.8 x 1024
7.9 x 1023
What is the molar mass of NaNO2?
70.00 g/mol
50.00 g/mol
60.00 g/mol
80.00 g/mol
How many grams does 2.50 mol of K weigh?
97.8 g
67.3 g
25.0 g
34.1 g
How many molecules are in a 10.0 L container of CO2 (g) at STP?
2.69 x 1023 molecules
5.87 x 1023 molecules
6.12 x 1023 molecules
3.47 x 1023 molecules
How many grams does 1.25 x 1023 molecules of SF6 weigh?
30.3 g
125 g
0.478 g
98.4 g
5 mol of solute is dissolved in 10 L of solution. What is the molarity?
0.5 M
2 M
5 M
0.2 M
How many moles of solute are in 2.0 L of a 0.30 M solution?
0.60 mol
6.0 mol
3.3 mol
0.15 mol
How many C atoms are in 2.0 mol of C4H10?
4.8 x 1024 C atoms
2.4 x 1024 C atoms
6.0 x 1023 C atoms
9.9 x 1024 C atoms
A sample contains 5.04 g of Mg and 33.5 g Br. Find the percent Mg.
13%
24%
35%
46%
What is the percent composition of each element in CaSO4?
29% Ca, 24% S, 47% O
10% Ca, 15% S, 75% O
20% Ca, 20% S, 60% O
18% Ca, 31% S, 51% O
A 3.0 L solution is marked as 15% solute. How much solute is there?
0.45 L
0.13 L
1.2 L
2.6 L
What abbreviation represents molarity?
M
m
m
Molarity is a measure of...
concentration
mass
volume
number of particles
The mole is a unit of...
concentration
mass
volume
number of particles
You missed 15 questions on a 75 question test. What's your grade?
20%
80%
60%
40%
A substance is found to be 40.2% Li and 59.8% P. Determine its empirical formula.
LiP
Li3P
Li2P3
LiP2
A substance contains 40.8 g of C and 54.4 g of O. Determine its empirical formula.
CO
CO2
C2O
CO3
A substance contains 5.40 mol H, 2.70 mol S, and 10.8 mol O. Determine its empirical formula.
HSO
H2SO
HS2O3
H2SO4
A chemical has a molar mass of 90.08 g/mol and its empirical formula is CH2O. Determine its molecular formula.
CH2O
C2H4O2
C3H6O3
C4H8O4
Which formula shows how many atoms are in a chemical?
molecular formula
empirical formula
Which formula shows shows the reduced ratio of atoms in a chemical?
molecular formula
empirical formula
A 300 mL solution is 0.8 M. How much water should be added to make the solution 0.6 M?
100 mL
400 mL
200 mL
300 mL
A 5.0 L solution is 1.2 M. If we dilute it to be 7.0 L, what is the new molarity?
0.86 M
1.0 M
0.17 M
0.55 M
Molar volume only works for...
solids
liquids
gases
Avogadro's number creates a relationship between which two units of mass?
AMU and grams
AMU and liters
grams and liters
Avogadro's number is...
6.02 x 1023
6.78 x 1022
6.13 x 1024
6.04 x 1021
A 1.0 L saltwater solution is 0.39 M. How many grams of NaCl are in the solution?
23 g
45 g
11 g
76 g
