AnswersFL-2003350-Chemistry 1 HonorsPercent Composition and Molecular Formula

Percent Composition and Molecular Formula Answers

9 verified answers
1
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What is the percent by mass of chlorine in NaCl?Use .

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A
35.45%
B
39.34%
C
60.66%
D
70.90%
2
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What is the percent by mass of carbon in C10 H14 N2?Use .

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A
8.71%
B
17.27%
C
69.50%
D
74.02%
3

What is the empirical formula for C2H6?

A
CH
B
CH3
C
C2H4
D
C6H18
4

Which statement best relates an empirical formula with a molecular formula?

A
They are always different for the same compound.
B
Subscripts of empirical formulas can be reduced.
C
Molecular formulas can be determined from empirical formulas.
D
They both show the actual ratio of elements for a compound.
5

What is the simplest whole-number ratio of atoms in a molecule or formula unit called?

A
the molecular formula
B
the molar mass
C
the percent composition
D
the empirical formula
6

Which step would help a student find the molecular formula of a compound from the empirical formula?

A
Multiply the subscripts of the empirical formula by the value of the ratio of the molar mass of the compound to the empirical molar mass of the compound.
B
Subtract the value of the ratio of the molar mass of the compound to the empirical molar mass of the compound from the subscripts of the empirical formula.
C
Divide the subscripts of the empirical formula by the value of the ratio of the molar mass of the compound to the empirical molar mass of the compound.
D
Add the value of the ratio of the molar mass of the compound to the empirical molar mass of the compound to the subscripts of the empirical formula.
7

What is the empirical formula for a compound if a sample contains 1.0 g of S and 1.5 g of O?

A
SO
B
SO3
C
S2O2
D
S2O3
8

A sample of a compound contains 60.0 g C and 5.05 g H. Its molar mass is 78.12 g/mol. What is the compound’s molecular formula?

A
CH
B
C2H2
C
C6H6
D
C6H
9

The percent by mass of copper in CuBr2 isUse .

Question illustration
A
28.45%.
B
44.30%.
C
63.55%.
D
71.55%.
10

The empirical formula for a compound is CH2. If n is a whole number, which shows a correct relationship between the molecular formula and the empirical formula?

A
empirical formula mass / molecular mass = n
B
molecular mass = element mass / empirical formula mass ´ 100
C
subscript of H in empirical formula = 2 subscript of H in molecular formula
Option C
D
subscript of C in molecular formula = n subscript of C in empirical formula
Option D
14

What is the empirical formula for a compound if a sample contains 1.0 g of S and 1.5 g of O?

A
SO
B
SO3
C
S2O2
D
S2O3

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