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Chemical Quantities 1
Test Description: Math of chemistry...moles, % composition, molar masses, conversions, empirical formulas
Instructions: Answer all questions to get your test result.
1) The molar mass of Ba(OH)2 is
A
308.6 g
B
154.3 g
C
155.3 g
D
171.3 g
2) A substance has an empirical formula of CH2 and a molar mass of 56 g/mol. The molecular formula for this compound is
A
CH2
B
C4H6
C
C8H4
D
C4H8
3) What is the percent composition by mass of nitrogen in NH4NO3?
A
35.0%
B
17.5%
C
52.5%
D
60.0%
4) A sample of a compound contains 65.4 grams of zinc, 12.0 grams of carbon, and 48.0 grams of oxygen. What is the mole ratio of zinc to carbon to oxygen in this compound?
A
1:1:2
B
5:1:4
C
1:4:6
D
1:1:3
5) A sample of a substance containing only magnesium and chlorine was tested in the laboratory and was found to be composed of 74.5% chlorine by mass. If the total mass of the sample was 190.2 grams, what was the mass of the magnesium?
A
48.5 g
B
24.3 g
C
70.9 g
D
142 g
6) In which compound is the percent by mass of oxygen the greatest?
A
CaO
B
BeO
C
SrO
D
MgO
7) Which is an empirical formula?
A
P4O6
B
C3H6
C
C2H4
D
P2O5
8) A hydrate is a compound that includes water molecules within its crystal structure. During an experiment to determine the percent by mass of water in a hydrated crystal, a student found the mass of the hydrated crystal to be 4.10 grams. After heating
A
11%
B
90%
C
0.40%
D
9.8%
9) The gram formula mass of NH4Cl is
A
95.5 g/mol
B
28.0 g/mol
C
53.5 g/mol
D
22.4 g/mol
10) What is the total number of moles of atoms contained in 1 mole of NH3?
A
1
B
3
C
2
D
4
*select an answer for all questions
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