Percent Composition from a Chemical FormulaThe percent composition of a compound can also be determined from the formula of thecompound. The subscripts in the formula are first used to calculate the mass of each element inone mole of the compound. That is divided by the molar mass of the compound and multipliedby 100%100%.mass of element in 1 mol% by mass =x 100%molar mass of compoundStep by StepCalculation of PercentComposition of a compoundExample:A certain newly synthesized compound is known to contain the elements zinc and oxygen. Whena 20.00g20.00g sample of the compound is decomposed, 16.07gof zinc remains. Determine thepercent composition of the compound.Step 1: List the known quantities and plan the problem.KnownMass of compound =20.00gMass of Zn=16.07gZnUnknownPercent Zn=?%Percent O=?%Step 2: Subtract to find the mass of oxygen in the compound. Divide each element's mass by themass of the compound to find the percent by mass.Mass of oxygen = 20.00 g – 16.07 g = 3.93 g O16.07 g Zn20.00 g% Zn =x 100% = 80.35% Zn3.93 g O20.00 g%0 =x 100% = 19.65% OStep 3: Conclude the result: The calculations make sense because the sum of the twopercentages adds up to 100%100%. By mass, the compound is mostly zinc.step 4Dichlorine heptoxide (Cl207)(Cl207) is a highly reactive compound used in some organicsynthesis reactions. Calculate the percent composition of dichlorine heptoxide. Follow thestep by step procedure shown above.

Given that - Dichlorine heptoxide , Cl2O7 , which is a highly reactive compound. The molar…

step 4 Dichlorine heptoxide (C1207)(C1207) is a highly reactive compound used in some organic synthesis reactions. Calculate the percent composition of dichlorine heptoxide. Follow the step by step procedure shown abo ve.

step 4 Dichlorine heptoxide (C1207)(C1207) is a highly reactive compound used in some organic synthesis reactions. Calculate the percent composition of dichlorine heptoxide. Follow the step by step procedure shown abo ve.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

Question

100%

Percent Composition from a Chemical Formula
The percent composition of a compound can also be determined from the formula of the
compound. The subscripts in the formula are first used to calculate the mass of each element in
one mole of the compound. That is divided by the molar mass of the compound and multiplied
by 100%100%.
mass of element in 1 mol
% by mass =
x 100%
molar mass of compound
Step by Step
Calculation of Percent
Composition of a compound
Example:
A certain newly synthesized compound is known to contain the elements zinc and oxygen. When
a 20.00g20.00g sample of the compound is decomposed, 16.07gof zinc remains. Determine the
percent composition of the compound.
Step 1: List the known quantities and plan the problem.
Known
Mass of compound =20.00g
Mass of Zn=16.07gZn
Unknown
Percent Zn=?%
Percent O=?%
Step 2: Subtract to find the mass of oxygen in the compound. Divide each element's mass by the
mass of the compound to find the percent by mass.
Mass of oxygen = 20.00 g – 16.07 g = 3.93 g O
16.07 g Zn
20.00 g
% Zn =
x 100% = 80.35% Zn
3.93 g O
20.00 g
%0 =
x 100% = 19.65% O
Step 3: Conclude the result: The calculations make sense because the sum of the two
percentages adds up to 100%100%. By mass, the compound is mostly zinc.
step 4
Dichlorine heptoxide (Cl207)(Cl207) is a highly reactive compound used in some organic
synthesis reactions. Calculate the percent composition of dichlorine heptoxide. Follow the
step by step procedure shown abo
ve.

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