Answered: compound has the composition: carbon…

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter11: Stoichiometry

Section: Chapter Questions

Problem 75A

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Question

A compound has the composition: carbon 37.21%; hydrogen 7.83%; and chlorine 54.96%. If its MW is 385 g/mol, determine (a) the empirical formula (b) the molecular formula.

	C	H	Cl
Mass of element (in g) (assuming 100 g of compound)	1._37.21_	2._7.83__	3._54.96_
Moles of element	4.______	5.______	6.______
Moles of element/Smallest moles	7.______	8.______	9.______
Multiplier	10._____	10._____	10.______
Empirical formula	11._____
Molecular weight of empirical formula	12._____
Molecular weight of compound / Molecular weight of empirical formula	13._____

True formula = C₁₂H₃₀Cl₆

_2.

A hydrocarbon has a MW of 114 g/mol and has a composition of carbon 84.06% and hydrogen 15.94%. What is its (a) empirical formula (b) true formula?

	C	H
Mass of element (in g) (assuming 100 g of compound)	1._84.06_	2._15.94__
Moles of element	3.______	4.______
Moles of element/Smallest moles	5.______	6.______
Multiplier	7.______	7.______
Empirical formula	8.______	9.______
Molecular weight of empirical formula	10._____
Molecular weight of compound / Molecular weight of empirical formula	11._____

True formula = C₈H₁₈

_3.

What is the empirical formula for the compound formed in previous problem?

	Cr	I
Mass of element (in g)	1. 1.30 g	2. 9.50 g
Moles of element	3.______	4.______
Moles of element/Smallest moles	5.______	6.______
Multiplier	7.______	7.______
Empirical formula	Cr I₃

Determine the empirical formula of a compound having the following composition: B a = 80.1%, 0 = 18.7%, H = 1.20%.

	B a	O	H
Mass of element (in g) (assuming 100 g of compound)	1._80.1_	2._18.7__	3._1.20_
Moles of element	4.______	5.______	6.______
Moles of element/Smallest moles	7.______	8.______	9.______
Multiplier	10.______	10.______	10.______
Empirical formula	Ba(OH)₂

An organic compound has a gram molecular weight of 372 g/mol, and its composition is 38.6% carbon, 9.76% hydrogen, and 51.56% oxygen. Determine (a) the empirical formula (b) the molecular formula.

	C	H	O
Mass of element (in g) (assuming 100 g of compound)	1._38.6_	2._9.76__	3._51.56_
Moles of element	4.______	5.______	6.______
Moles of element/Smallest moles	7.______	8.______	9.______
Multiplier	10._____	10._____	10.______
Empirical formula	11._____
Molecular weight of empirical formula	12._____
Molecular weight of compound / Molecular weight of empirical formula	13._____

True formula = C₁₂H₃₆O₁₂

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