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WHACK-A-MOLE
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5
1
Convert 192 grams of NaNO3 to number of formula units.
2
What is the percent composition of phosphorus in Zn3(PO4)2?
3
What is the empirical formula for a compound that contains 10.89% magnesium,
31.77% chlorine, and 57.34% oxygen?
4
Calculate the number of atoms in 13.2 moles of copper.
5
What is the correct molar mass for CaBr2?
6
How many moles of Ag contain 4.49 x 1023 atoms Ag?
7
The mass of each element making up 37.2 grams of a compound were measured. Based on these data,
what is the correct formula for the compound?
Element
Mass in 37.2 grams of
compound
Magnesium
10.72 g
Carbon
5.30 g
Oxygen
21.18 g
8
Which element has a molar mass of 30.974 g/mol?
9
What is the molar mass of the element Calcium?
10
Which is the correct empirical formula for this substance?
Element
Percent Composition
C
37.5%
H
12.5%
O
50.00%
11
What is the molar mass for the compound FeSO4?
12
Which is the formula for a compound that contains 64.75 g nitrogen and 185.25 g oxygen?
a. NO2
b. NO
c. N2O
d. N2O5
13
What is the mass of 8 moles of sodium chloride?
14
Which is the percent composition of bromine in the compound NaBr?
a. 81.6%
b. 79.9%
c. 84.1%
d. 77.7%
15
Which term is described as the lowest whole-number ratio of elements in a compound?
a. hydrate
b. molecular formula
c. empirical formula
d. percent composition
16
Find the number of moles in 8.3 x 1025 atoms of Nitrogen.
17
Determine the empirical formula for succinic acid that is composed of 40.6% carbon, 5.18% hydrogen,
and 54.22% oxygen.
18
What is the number of moles present in 200 g magnesium?
19
What is the empirical formula for hydrogen peroxide?
20
What is the molar mass of methane?