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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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You are given 1.00 gram of each of five substances. In which of the substances will there be the greatest number of potassium ions when dissolved in water?

a. potassium chloride

b. potassium chlorate

c. potassium phosphate

d. potassium nitrate

e. potassium carbonate

Interpretation Introduction

Interpretation:

The substance that gives the greatest number of potassium ions when 1.00gram of it is dissolved in water is to be calculated.

Concept Introduction:

A mole of a substance is defined as the same number of particles of the substance as present in 12g of 12C. The number of particles present in one mole of a substance is 6.023×1023 particles. The number of moles of a substance is given as,

n=mM    (1)

Where,

  • m represents the mass of the substance.
  • M represents the molar mass of the substance.
Explanation

Reason for correct option:

(e)

The mass of potassium carbonate is 1.00g.

The molar mass of potassium carbonate is 138.205gmol1.

The number of moles of a substance is given as,

n=mM    (1)

Where,

  • m is the mass of the substance.
  • M is the molar mass of the substance.

Substitute the value of mass and molar mass of potassium carbonate in the equation(1).

n=1.00g138.205gmol1=7

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