AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Percent Composition and Molecular Formula Answers

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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%
2
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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%
3

What is the empirical formula for C2H6?

A
CH
B
CH3
C
C2H4
D
C6H18
4

A sample of a compound contains 32.0 g C and 8.0 g H. Its molar mass is 30.0 g/mol. What is the compound’s molecular formula?

A
CH3
B
CH4
C
C2H4
D
C2H6
5

What is the empirical formula for a compound if a sample contains 3.72 g of P and 21.28 g of Cl?

A
PCl5
B
PCl3
C
P2Cl10
D
P2Cl5
6

The percent by mass of copper in CuBr2 isUse .

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A
28.45%.
B
44.30%.
C
63.55%.
D
71.55%.
7

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
8

Which information must be known about a compound to find the molecular formula from the empirical formula?

A
density
B
formula mass
C
percent composition
D
mole ratio
9

Webb has calculated the percent composition of a compound. How can he check his result?

A
by making sure they are in the lowest ratio
B
by adding them to see if they total 100
C
by checking that they are whole-number multiples
D
by dividing them by the molar mass
10

What is the percent by mass of sodium in ?Use

Question illustration
A
16.18%
B
22.58%
C
32.37%
D
45.98%

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