rev: 11-Oct-20105. In an experiment, 169 g of FeCr2 O4, 298 g of K2CO3, and 75.0 g of O2 were reacted.If the amount of K2CrO4 isolated was 194 g, calculate the percent yield of the reaction.Also, calculate the amount in grams of excess reactants, if any.223.84 g/mol 138.21g/mol 31.998g/mol 194.19g/mol 159.69g/mol 44.010g/mol4FeCr2O4(s) 8K2CO3(s)Molar masses:+702(g)8K2CrO4(s) + 2Fe O3(s)+ 8CO2(g)

Question
Asked Oct 6, 2019
8 views

How do you solve this?

rev: 11-Oct-2010
5. In an experiment, 169 g of FeCr2 O4, 298 g of K2CO3, and 75.0 g of O2 were reacted.
If the amount of K2CrO4 isolated was 194 g, calculate the percent yield of the reaction.
Also, calculate the amount in grams of excess reactants, if any.
223.84 g/mol 138.21g/mol 31.998g/mol 194.19g/mol 159.69g/mol 44.010g/mol
4FeCr2O4(s) 8K2CO3(s)
Molar masses:
+702(g)
8K2CrO4(s) + 2Fe O3(s)
+ 8CO2(g)
help_outline

Image Transcriptionclose

rev: 11-Oct-2010 5. In an experiment, 169 g of FeCr2 O4, 298 g of K2CO3, and 75.0 g of O2 were reacted. If the amount of K2CrO4 isolated was 194 g, calculate the percent yield of the reaction. Also, calculate the amount in grams of excess reactants, if any. 223.84 g/mol 138.21g/mol 31.998g/mol 194.19g/mol 159.69g/mol 44.010g/mol 4FeCr2O4(s) 8K2CO3(s) Molar masses: +702(g) 8K2CrO4(s) + 2Fe O3(s) + 8CO2(g)

fullscreen
check_circle

Expert Answer

Step 1

Determine the limiting reagent:

help_outline

Image Transcriptionclose

Mass No. of moles Molar mass 169 g 0.755 mol No. of moles of FeCr,O - 223.84 g/mol 298 g 138.21 g/mol = 2.156 mol No. of moles of K2CO 75 g =2.344 mol No. of moles of O2 31.998 g/mol From the equation, 0.755 mol FeCr04 reacts with 1.51 mol K2CO, and 1.321 mol O2 FeCr,04 Hence, limiting reagent

fullscreen
Step 2

Mass of excess reactants (K2CO3 and O2) is determined as follows,

help_outline

Image Transcriptionclose

Excess no. of moles of K2CO (2.156 mol)- (1.51 mol) 0.646 mol Mass of excess K,co, = (0.646 mol) (138.21 g/mol) = 89.28 g Excess no. of moles of O, (2.344 mol)-(1.321 mol) 1.023 mol Mass of excess O2 = (1.023 mol) (31.998 g/mol) 32.73 g Hence, 89.28 g of K,CO, and 32.73 g O2 is excess after the completion of reaction

fullscreen
Step 3

From the equation, it is clear that 4 mol of FeCr2O7 reacts to give 8 mol of K2CrO4. Hence, the theoretical ...

help_outline

Image Transcriptionclose

4 mol FeCr,0, - 8 mol K2C1O 0.755 mol FeCr,O7 > ? 8 mol K CrO 4 mol FeCr,O No. of moles of K,CrO4 formed = 0.755 mol FeCrO, x- 1.51 mol K2CrO 4 Theoretical mass of K,CrO4 (1.51 mol)(194.19 g/mol) 293.23 g K CrO

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

General Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: write equations for the decomposition of h2co3 (aq) and h2so3 (aq)

A: Decomposition reaction:It is a reaction in which a reactant is broken down into multiple products.

question_answer

Q: State the orbital degeneracy (how many orbitals) of the levels in a hydrogen atom that have energy a...

A: Please verify the values of energy given, they must have a negative sign. The energy of a hydrogen a...

question_answer

Q: A 5.500g mixture of sodium chloride, silicon dioxide, and ammonium chloride wasn’t heated by in orde...

A: The amount of NH4Cl present in the original mixture = 5.500 g x (22/ 100) =1.21 g

question_answer

Q: Which aqueous solution would exhibit a lower freezing point, 0.35 M K2SO4 or 0.50 M KCl? Explain.

A: Depression or lowering in freezing point is one of the colligative properties of a solution which de...

question_answer

Q: The following skeletal oxidation-reduction reaction occurs under acidic conditions. Write the balanc...

A: Balancing redox reaction by ion-electron method:In the ion-electron method (also called the half-rea...

question_answer

Q: Aqueous solutions of aluminum ions Al^3+ are acidic while those of carbonate CO3^-2 are basic why?

A: Click to see the answer

question_answer

Q: When a sample of oxalic acid (H2C2O4), which is a diprotic acid (both H-atoms are acidic), is titrat...

A: Given,0.250 M KOH solution.24.66 ml KOH soltion for neutralisation.

question_answer

Q: Consider the following compound: Sr3(PO4)2 *4H2O   -Calculate the theoretical percent strontium by m...

A: The mass percent of strontium in Sr3(PO4)2 * 4H2O is calculated as,

question_answer

Q: 14. The total volume of the Pacific Ocean is estimated to be 7.2 × 108 km3. A medium-sized atomic bo...

A: From the given volume of the Pacific Ocean, the mass can be calculated as follows: