   Chapter 4, Problem 95GQ

Chapter
Section
Textbook Problem

An unknown metal reacts with oxygen to give the metal oxide, MO2. Identify the metal if a 0.356-g sample of the metal produces 0.452 g of the metal oxide.

Interpretation Introduction

Interpretation:

The unknown metal in the given reaction has to be identified.

Concept introduction:

• The number of moles of any substance can be determined  using the equation

Numberofmole=GivenmassofthesubstanceMolarmass

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
• Molarmass=GivenmassofthesubstanceMoleofthesubstance
• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.
Explanation

The mass of oxygen and its mole can be calculated as follows,

Mass of oxygen =0.452g0.356g =0.096g

Amount of O2 available =0.09632 = 0.003molofOxygen

Balanced chemical equation for the given reaction is,

M+O2MO2

Where M is metal

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