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Mole/Empirical Formula Problems
Test Description: Reviewing moles and how to find empirical formula, including the formula of hydrates
Instructions: Answer all questions to get your test result.
1) The mass of 1 mole of Ba(OH)2 is
A
155.3 g
B
154.3 g
C
171.3 g
D
308.6 g
2) A substance has the empirical formula of CH2, with a sample measured as weighing 56 g/mol. The molecular formula is...
A
C8H4
B
C4H8
C
CH2
D
C4H6
3) A substance contains 65.4 g Zinc, 12.0 g Carbon, and 48 g Oxygen. What is its empirical formula?
A
Zn1C4O6
B
Zn1C1O3
C
Zn5C1O4
D
Zn1C1O2
4) A sample of Magnesium and chlorine is found to have the empirical formula Mg2Cl4. A sample is put through a mass spectrometer and found to weigh 190 amu. It's molecular formula is...
A
Mg2Cl4
B
MgCl3
C
Mg2Cl5
D
MgCl2
5) Which is the empirical formula?
A
P6O15
B
P2O5
C
P8020
D
P4O10
6) NH4Cl would have a molar mass of...
A
53.4 g/mol
B
53.4 amu
C
97 g/mol
D
97 amu
7) A substance that is 92.3% C and 7.7% H would have an empirical formula of...
A
C1H1
B
C4H4
C
C3H3
D
C2H2
8) A sample of anhydrous NaCl has a mass of of 29.22 g/mol. The water (H2O) that was removed had a mass of 36.05 g/mol. What was the Hydrates formula?
A
1 NaCl * 4 H2O
B
6 NaCl * 1 H2o
C
4 NaCl * 1 H2O
D
2 NaCl * 8 H2O
9) A solution with 200 mL of 3.00 M CuCl2 contains how many moles of CuCl2?
A
600 moles
B
.667 moles
C
667 moles
D
.600 moles
10) What is the mass of a contained filled with 88.8 L of Nitrogen molecules?
A
send help
B
111 g/mol
C
55.5 g/mol
D
i'm bored of making up answers
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