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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Question
Number of atoms?
Expert Solution
Step 1
A mole is a collection of avagadro number of particle I.e 6.023*1023 particle
1 mole of substance weighs its molar mass and contain avagadro number of particle
Let mass of a substance be m gm and it's molar mass be M gm/mol
Moles = mass taken/ molar mass = m/M
Mass of sulphur trioxide taken m=54.7 g
Molar mass of sulphur trioxide = mass of sulphur +Mass of oxygen
Molar mass of sulphur trioxide =32gm+16*3gm=(32+48)ģm=80 gm
Moles of sulphur trioxide = mass taken/ molar mass
Moles of sulphur trioxide = 54.7 g/80gm/mol = 0.68375 mol
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