Percent Composition and Molecular Formula

Question 1

What is the percent by mass of chlorine in NaCl?Use .

Revolt · Accepted Answer

60.66%

Question 2

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

Revolt · Accepted Answer

SO3

Question 3

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

Revolt · Accepted Answer

formula mass

Question 4

Which represents the empirical formula for A3B9?

Revolt · Accepted Answer

AB3

Question 5

The percent by mass of copper in CuBr2 isUse .

Revolt · Accepted Answer

28.45%.

Question 6

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

Revolt · Accepted Answer

the empirical formula

Question 7

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

Revolt · Accepted Answer

by adding them to see if they total 100

Question 8

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

Revolt · Accepted Answer

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.

Question 9

What is the percent by mass of carbon in C10 H14 N2?Use .

Revolt · Accepted Answer

74.02%

Question 10

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?

Revolt · Accepted Answer

C6H6

Percent Composition and Molecular Formula Answers

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