 empirical formulas and percent composition
2 years ago
mritch8801
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Practice 10 QuestionsShow answers
• Question 1
120 seconds
Q. Find the percent composition of Cu2S?
%Cu= 67.987 %S= 32.013
%Cu= 79.854   %S= 20.145
%Cu= 35.946   %S= 64.054
• Question 2
120 seconds
Q. A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
Mg4N3
MgN2
Mg3N
MgN
• Question 3
120 seconds
Q. Which of the following is considered an empirical formula?
CH3COOH
C6H12O6
H2O
• Question 4
120 seconds
Q. What is the percentage of oxygen in carbon dioxide? (CO2)
27.3%
72.7%
30%
70%
• Question 5
120 seconds
Q. You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
SO
SO2
SO3
SO4
• Question 6
120 seconds
Q. What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
C3H8
CH4
C2H2
C4H10
• Question 7
120 seconds
Q. A formula with the lowest whole # ratio of elements in a compound is called
Molecular Formula
Chemical Formula
Empirical Formula
Distance Formula
• Question 8
120 seconds
Q. What is the percentage of chlorine in sodium chloride? (NaCl)
60.7%
39.3%
60%
40%
• Question 9
120 seconds
Q. What is the percentage of iron in iron(III)oxide?
30%
70%
40%
60%
• Question 10
120 seconds
Q. Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.