   Chapter 2, Problem 147GQ

Chapter
Section
Textbook Problem

Pepto-Bismol, which can help provide relief for an upset stomach, contains 300. mg of bismuth subsalicylate, C21H15Bi3O12, per tablet. If you take two tablets for your stomach distress, what amount (in moles] of the “active ingredient” are you taking? What mass of Bi are you consuming in two tablets?

Interpretation Introduction

Interpretation: for the given amount of bismuth subsalicylate tablet, the number of moles and the mass of Bi in two tablets are needed to be calculated.

Concept introduction:

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

Mass: It is the quantitative measure of a substance. The amount of matter present in substance is expressed as mass. The S.I. unit of mass is kg.

Explanation

The amount of bismuth subsalicylate in two tablets is given that 2×300mg=0.6g.

The molar mass of bismuth subsalicylate is 362g/mol.

Conversion formula for mass of a molecule into number moles,

Numberofmoles=MassingramsMolarmass

Therefore, the number of moles of bismuth subsalicylate is,

Numberofmoles=0.6g362g/mol=1.66×103mol

The molar mass of Bi is 208.98g.

Bismuth subsalicylate (C21H15Bi3O12) contains 3 Bi per compound

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