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Chemistry Question

Chemistry Question

Chemistry
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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Step 1

Balanced chemical reaction is given by,

4Al(s) + 3O2(g)  → 2Al2O3(s)

 

Step 2: Part-A

Given:

Mass of Al = 1.0 g

Mass of O2 = 1.0 g

Molar mass of Al = 26.98 g/mol

Molar mass of O2 = 32.0 g/mol

 

Calculation for moles of Al:

number of moles=massmolar massnumber of moles = 1.0 g26.98 g/molmoles of Al = 0.037 mol

 

Calculation for moles of O2:

number of moles=massmolar massnumber of moles = 1.0 g32.0 g/molmoles of O2 = 0.03125 mol

 

Identifying limiting reactant:

Actual moles of Al = 0.037 mol/4 = 0.00925 mol

Actual moles of O2 = 0.03125 mol/3 = 0.0104 mol

 

Number of moles of Al < Number of moles of O2

Therefore, Al is a limiting reagent.

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