Chapter 2, Problem 140GQ

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Stibnite, Sb2S3, is a dark gray mineral from which antimony metal is obtained. What is the mass percent of antimony in the sulfide? If you have 1.00 kg of an ore that contains 10.6% antimony, what mass of Sb2S3 (in grams) is in the ore?

Interpretation Introduction

Interpretation: The mass percent of antimony in Sb2S3 and the mass of Sb2S3 in the ore if 1kg of an ore which contain 10.6% antimony.

Concept introduction:

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol)
• Mass percentage is one way to represent the concentration of an element in a compound or a component in a mixture. Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
• Moles: One mole is equivalent to the mass of the substance consists same number of units equal to the atoms present in 12g of 12C.
• From given mass of substance moles could be calculated by using the following formula,

Molesofsubstance GivenmassofsubstanceMolecularmass

Explanation

Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.

The molar mass given compound stibnite Sb2S3 is 339.7â€‰g/mol

The mass percent of antimony in Sb2S3 can be calculated as follows,

Molarâ€‰Massâ€‰â€‰ofâ€‰â€‰Sbâ€‰â€‰inâ€‰theâ€‰â€‰compoundâ€‰ =â€‰â€‰2â€‰Ã—â€‰121.76â€‰=â€‰â€‰243.52â€‰â€‰g/molâ€‰Massâ€‰â€‰percentâ€‰â€‰ofâ€‰â€‰Sbâ€‰inâ€‰â€‰â€‰Sb2S3â€‰â€‰â€‰â€‰â€‰=â€‰â€‰Molarâ€‰â€‰massâ€‰â€‰ofâ€‰â€‰â€‰Sbâ€‰Molarâ€‰â€‰massâ€‰â€‰ofâ€‰â€‰Sb2S3â€‰Ã—100â€‰â€‰â€‰â€‰=â€‰â€‰243

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