WorksheetsChemistry Chapter 6 Test
Total questions: 15
Worksheet time: 22mins
What is the molar mass of sucrose, C12H22O11?
29.018 g/mol
562,509 g/mol
342.297 g/mol
74.018 g/mol
What is the molar mass of the compound aluminum oxalate, Al2(C2O4)3?
55.0 g/mol
115 g/mol
142 g/mol
318 g/mol
Which of the following contains the greatest number of atoms?
65.5 g B
65.5 g W
65.5 g Y
65.5 g P
All contain the same number of atoms.
Which of the following represents the greatest number of atoms?
65.5 mol Si
65.5 mol Se
65.5 mol Sn
65.5 mol Sb
All answers contain the same number of atoms.
How many atoms are in 1.00 moles of silver (Ag)?
6.022 x 1023 atoms Ag
107.87 atoms Ag
6.50 x 1025 atoms Ag
About a dozen atoms of Ag
One mole of something consists of _______ units of that substance.
12.01
6.022 x 1023
1.008
1.66 x 1024
You've been asked to prepare 2.500 moles of liquid bromine for an experiment. How many grams of bromine should you weigh out on your scale?
199.8 g
199.76 g
200 g
200. g
Ethylene glycol (C2H6O2) is a colorless, odorless chemical that has a very delicious, sweet taste. It is also extremely poisonous. Typically, we find ethylene glycol as the active ingredient in antifreeze. 2.050 x 1026 molecules of ethylene glycol represents how many moles of the substance?
1.23 x 1050 mol
21,130 mol
1.989 x 1048 mol
340.4 mol
You need to know how many grams are represented by 0.00191 moles of Benzene (C6H6). What would be the best way to solve this problem?
Take the moles of benzene you are given and divide by the molar mass of benzene.
First multiply the moles of benzene by the molar mass, then multiply by Avogadro's number (6.022 x 1023).
Divide the moles of benzene given by Avogadro's number (6.022 x 1023).
Take the moles of benzene you are given and multiply by its molar mass.
Sodium benzoate (NaC7H5O2) is a widely used food preservative. Its history is controversial, since sodium benzoate reacts with vitamin C to form benzene, a known carcinogen. What is the percent composition of carbon in sodium benzoate?
58.3%
0.583%
8.3%
16.0%
What is the percent by mass of erbium in erbium oxide, Er2O3?
87.5%
12.5%
0.875%
43.7%
Europium oxide (EuO4) and dysprosium oxide (DyO4) have very similar chemical formulas. Which compound contains the greater percentage of oxygen by mass?
EuO4
DyO4
Impossible to determine using the given information.
You have narrowed down the identity of an unknown mineral to either praseodymium chloride (PrCl3), neodymium chloride (NdCl2), or samarium chloride (SmCl3). An experiment determined that the mineral is 33.0% chlorine. Which mineral do you likely possess?
PrCl3
NdCl2
SmCl3
Unable to determine with the given information.
You have made an unknown chemical in the lab. It is a yellow solid and it is highly reactive. You were able to calm down its reactivity enough to determine that it is 7.19% phosphorus and 92.81% bromine, by mass. What is the empirical formula for the compound that you made?
PB37
PBr5
P5Br5
P5Br
5.44 grams of an unknown nitrogen-oxygen compound is found to contain 3.10 grams of nitrogen. What is the empirical formula for this unknown compound?
NO
N2O
N3O2
N2O3
