Percent Composition and Molecular Formula

Question 1

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 2

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 3

What is the percent by mass of sodium in ?Use

Revolt · Accepted Answer

32.37%

Question 4

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

Revolt · Accepted Answer

the empirical formula

Question 5

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?

Revolt · Accepted Answer

C2H6

Question 6

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

Revolt · Accepted Answer

60.66%

Question 7

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

Revolt · Accepted Answer

PCl5

Question 8

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

Percent Composition and Molecular Formula Answers

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