Answers NY-Chemistry Term 1 HillcrestPercent Composition and Molecular Formula

Percent Composition and Molecular Formula Answers

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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?

CH3

CH4

C2H4

C2H6

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

density

formula mass

percent composition

mole ratio

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

by making sure they are in the lowest ratio

by adding them to see if they total 100

by checking that they are whole-number multiples

by dividing them by the molar mass

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

PCl5

PCl3

P2Cl10

P2Cl5

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

the molecular formula

the molar mass

the percent composition

the empirical formula

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

SO3

S2O2

S2O3

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

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.

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.

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.

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.

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

35.45%

39.34%

60.66%

70.90%

What is the percent by mass of sodium in ?Use

16.18%

22.58%

32.37%

45.98%

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?

C2H2

C6H6

C6H

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Percent Composition and Molecular Formula Answers

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