Concept explainers
Videos
Interpretation: The mass of iron (III) oxide produced on heating 1.25 g of iron and 0.0204 mole of oxygen gas needs to be calculated.
Concept introduction: The ratio of the mass of a substance to its molar mass is said to be the number of moles of that substance.
Answer to Problem 40A
The mass of iron (III) oxide produced on heating 1.25 g of iron and 0.0204 mole of oxygen gas is 1.76 g .
Explanation of Solution
The chemical equation for the formation of iron(III) oxide from iron and oxygen gas is:
Fe(s) + O2(g)→Fe2O3(s)
The above reaction is not balanced as the number of atoms of Fe and O is 1 and 2 on the reactant side and 2 and 3 on the product side.So in order to balance the reaction, coefficient 4 and 3 are written before Fe and O2 respectively on the reactant side and coefficient 2 is written before Fe2O3 on the product side. Thus, the balanced equation is:
4Fe(s) + 3O2(g)→2Fe2O3(s)
The mass of iron (III) oxide produced will be calculated after determining the limiting reagent (The reagent in a reaction that controls the amount of product formed is termed as limiting reagent. After completion of
Calculating the moles of iron as:
Number of moles=MassMolar mass
The molar mass of iron is 55.845 g/mol. The number of moles of ironwill be:
nFe=1.25 g55.845 g/molnFe=0.022 mol
The given mole of oxygen gas is 0.0204 mol.
In the above-balanced reaction, 4.0 mol of Fe reacts with 3.0 mol of O2 . So, the number of moles of Fe required to react with 0.0204 mol of O2 is:
0.0204 mol of O2×4 mol of Fe3 mol of O2 = 0.0272 mol of Fe
Since, the required moles of Fe is 0.0272 mol and the available amount is 0.022 mol , so Fe is the limiting reactant and O2 is present in excess. So, the amount of iron(III) oxide formed will depend on the number of moles of Fe :
From the balanced chemical reaction, the mole ratio of Fe and iron(III) oxide is 4:2 so, the number of moles of water iron(III) oxide from 0.022 mol of Fe is:
0.022 mol of Fe×2 mol of Fe2O34 mol of Fe = 0.011 mol of Fe2O3
Now, the mass of iron(III) oxide produced is calculated as:
The molar mass of iron(III) oxide is 159.69 g/mol. So,
Number of moles=MassMolar mass0.011 mol=Mass159.69 g/molMass = 0.011 mol×159.69 g/molMass = 1.76 g
Hence, the mass of iron (III) oxide produced on heating 1.25 g of iron and 0.0204 mole of oxygen gas is 1.76 g .
Chapter 9 Solutions
World of Chemistry, 3rd edition
- 1. Show the steps necessary to make 2-methyl-4-nonene using a Wittig reaction. Start with triphenylphosphine and an alkyl halide. After that you may use any other organic or inorganic reagents. 2. Write in the product of this reaction: CH3 CH₂ (C6H5)₂CuLi H₂O+arrow_forward3. Name this compound properly, including stereochemistry. H₂C H3C CH3 OH 4. Show the step(s) necessary to transform the compound on the left into the acid on the right. Bri CH2 5. Write in the product of this LiAlH4 Br H₂C OHarrow_forwardWhat are the major products of the following reaction? Please provide a detailed explanation and a drawing to show how the reaction proceeds.arrow_forward
- What are the major products of the following enolate alkylation reaction? Please include a detailed explanation as well as a drawing as to how the reaction proceeds.arrow_forwardA block of zinc has an initial temperature of 94.2 degrees celcius and is immererd in 105 g of water at 21.90 degrees celcius. At thermal equilibrium, the final temperature is 25.20 degrees celcius. What is the mass of the zinc block? Cs(Zn) = 0.390 J/gxdegrees celcius Cs(H2O) = 4.18 J/gx degrees celcusarrow_forwardPotential Energy (kJ) 1. Consider these three reactions as the elementary steps in the mechanism for a chemical reaction. AH = -950 kJ AH = 575 kJ (i) Cl₂ (g) + Pt (s) 2C1 (g) + Pt (s) Ea = 1550 kJ (ii) Cl (g)+ CO (g) + Pt (s) → CICO (g) + Pt (s) (iii) Cl (g) + CICO (g) → Cl₂CO (g) Ea = 2240 kJ Ea = 2350 kJ AH = -825 kJ 2600 2400 2200 2000 1800 1600 1400 1200 1000 a. Draw the potential energy diagram for the reaction. Label the data points for clarity. The potential energy of the reactants is 600 kJ 800 600 400 200 0 -200- -400 -600- -800- Reaction Progressarrow_forward
- Can u help me figure out the reaction mechanisms for these, idk where to even startarrow_forwardHi, I need your help with the drawing, please. I have attached the question along with my lab instructions. Please use the reaction from the lab only, as we are not allowed to use outside sources. Thank you!arrow_forwardHi, I need your help i dont know which one to draw please. I’ve attached the question along with my lab instructions. Please use the reaction from the lab only, as we are not allowed to use outside sources. Thank you!arrow_forward
- 5. Write the formation reaction of the following complex compounds from the following reactants: 6. AgNO₃ + K₂CrO₂ + NH₄OH → 7. HgNO₃ + excess KI → 8. Al(NO₃)₃ + excess NaOH →arrow_forwardIndicate whether the product formed in the reaction exhibits tautomerism. If so, draw the structure of the tautomers. CO₂C2H5 + CH3-NH-NH,arrow_forwardDraw the major product of this reaction N-(cyclohex-1-en-1-yl)-1-(pyrrolidino) reacts with CH2=CHCHO, heat, H3O+arrow_forward
ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage Learning
ChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill Education
Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill Education
Chemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage Learning
Elementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY