   Chapter 3, Problem 163CWP

Chapter
Section
Textbook Problem

Calculate the number of moles for each compound in the following table. Compound Mass Moles Magnesium phosphate 326.4 g _____ Calcium nitrate 303.0 g _____ Potassium chromate 141.6 g _____ Di nitrogen pentoxide 406.3 g _____

Interpretation Introduction

Interpretation: The numbers of moles for the given compounds are to be calculated.

Concept introduction: The number of moles in an atom is defined as the given mass divided by the molecular mass. One mole is equal to the Avogadro’s number and each element consists of different molar mass that depends on the weight of its atom.

Explanation

Explanation

The Molar mass of (Mg3(PO4)2)=262.9 g/mol.

The given Mass of (Mg3(PO4)2)=326.4 g.

The number of moles is calculated by the formula,

Numberofmoles=GivenmassMolarmass

Substitute the value of Mass and Molar mass of (Mg3(PO4)2) in the above expression.

Numberofmoles=GivenmassMolarmass=326.4 g262.9 g/mol=1.241 mol_

Hence the Molar Mass of (Mg3(PO4)2) is 1.241 mol_.

The given compound is Calcium nitrate with the molecular formula (Ca(NO3)2).

The Molar mass of (Ca(NO3)2)=164 g/mol.

The given Mass of (Ca(NO3)2)=303.0 g.

The number of moles is calculated by the formula,

Numberofmoles=GivenmassMolarmass

Substitute the value of Mass and Molar mass of (Ca(NO3)2) in the above expression.

Numberofmoles=GivenmassMolarmass=303.0 g164.0 g/mol=1.847 mol_

Hence the Molar Mass of (Ca(NO3)2) is 1

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