User Account

All Pages

Explain why this reaction forms the same volume of hydrogen

Assignment Help Chemistry
Reference no: EM131108440

1.  Iron (II) sulphate, FeSO4, is easily oxidised to iron(III) sulphate.

(a) Calculate the percentage by mass of iron in iron(II) sulphate. ........................................ %

(b) An impure sample of iron(II) sulphate was analysed by titration. The sample was dissolved in 25.0 cm3 of dilute sulphuric acid and then titrated against 0.0400 mol/dm3 potassium dichromate(VI) solution.

19.0 cm3 of potassium dichromate(VI) solution was required to reach the end-point.

(i) Calculate the number of moles of potassium dichromate(VI) used in the titration......................................... moles

(ii) One mole of potassium dichromate(VI) reacts with six moles of iron(II) ions.Calculate the mass, in grams, of iron(II) ions in the sample analysed.mass of iron(II) ions........................................ g

2.  A 0.24 g sample of magnesium ribbon is added to 5.0 cm3 of 2.0 mol/dm3 ethanoic acid.

Explain why this reaction forms the same volume of hydrogen but takes place much more slowly than the reaction of the same mass of magnesium with 5.0 cm3 of 2.0 mol/dm3 hydrochloric acid.

3.  A 1.2 g sample of powdered brass was analysed by reaction with excess dilute sulphuric acid.
The zinc reacts as shown in the equation to form 0.072 dm3 of hydrogen measured at room temperature and pressure.
Zn + 2H+ → Zn2+ + H2

(i) Suggest why brass was used in a powdered rather than lump form. 

(ii) Calculate the mass of zinc in the sample of brass.

(iii) Calculate the percentage of zinc in the sample of brass.

4.                                         2Mg + CO2 → 2MgO + C

(a) When 2 moles of magnesium react with one mole of carbon dioxide, 810 kJ of energy are released.

Calculate the energy released when 2.0 g of magnesium reacts completely with carbon dioxide.

5. a)  25.0 cm3 of an aqueous solution of calcium hydroxide is exactly neutralised by 18.0 cm3 of 0.040 mol/dm3 hydrochloric acid.

Ca(OH)2 + 2HCl → CaCl2 + 2H2O

Calculate the concentration, in mol/dm3, of the aqueous calcium hydroxide.

6.  Analysis of 10.0 g of carboxylic acid X shows that it contains 2.67 g carbon, 0.220 g hydrogen and 7.11 g oxygen.

(i) Deduce the empirical formula of X. 

(ii) The relative molecular mass of X is 90. Deduce the molecular formula of X.

7.  The table shows the concentration of different ions found in a sample of aqueous industrial waste. 

14_1.png

8.  Ethanol can also be manufactured from glucose, C6H12O6.

C6H12O6 →2CO2 + 2C2H5OH.

A solution containing 18 kg of glucose makes only 0.92 kg of ethanol.

Calculate the percentage yield of ethanol. 

 

Reference no: EM131108440

Questions Cloud

Test the hypothesis that the degree of pollution : Gerstein (1965) studied the long-term pollution of Lake Michigan and its effect on the water supply for the city of Chicago. One of the measurements considered by Gerstein was the annual number of "odor periods" over the period of years 1950-1964...
What is the journal entry necessary in 2010 : If a new tax rate for 2013 of 20% is enacted into law at the end of 2010, what is the journal entry necessary in 2010 (if any) to adjust deferred taxes?
International finance and banking : North Star Company, a U.S. based MNC, is considering to establish a subsidiary to capitalize on the removal of Eastern European border restrictions. The subsidiary would manufacture clothing in Germany and target the Eastern European countries for mo..
Who delivers easter eggs to swiss youngsters : American children get their Easter eggs from the Easter Bunny. Who delivers Easter eggs to Swiss youngsters
Explain why this reaction forms the same volume of hydrogen : Explain why this reaction forms the same volume of hydrogen but takes place much more slowly than the reaction of the same mass of magnesium with 5.0 cm3 of 2.0 mol/dm3 hydrochloric acid.
The voting members of the federal open market committee : The voting members of the Federal Open Market Committee are
What is the approximate bias field : What is the required bias field if the H-plane geometry of Figure 9.11b is used?
What was used for bait : Chinese writings dating back to the fourth century B.C. mention fishing with a bamboo rod, silk line and hook made from a needle. What was used for bait
Discuss the necessary changes in the expression relating : In Comment 4, we noted that we have K = 2K' - {n(n - 1)/2}, where K' = (number of concordant pairs), when there are neither tied X nor tied Y observations.

Reviews

Write a Review

Chemistry Questions & Answers

  Differences between burning of solid fuel

Create an 18- to 20-slide presentation on one of the topics below. You many use various sources, including your textbook or other scholarly material. Since you will not be presenting this PowerPoint to your instructor or class mates in person, you..

  Determine if the reactions indicated can be done

Determine if the reactions indicated below can be done in one step by writing yes or no to the right of the indicated reaction. Please explain it.

  The reaction of bromethane with nu

Draw the SN2 mechanism using curved arrows for the reaction of bromethane with Nu. Draw the SN2 mechanism using curved arrows for the reaction of 2-bromopropane with Nu

  Explain smaller differences observed among the pentanols

Even though butanols have the same number of the same atoms, we see large differences in their ability to dissolve water. How do you account for this? How might you account for the much smaller differences observed among the pentanols

  Define what is the vapor pressure of the solution at 20 °c

A solution is made by mixing 45.0 mL of ethanol, C2H6O, and 55.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C

  Explain how is the solution adjusted to the ph

The ananlysis procedure in this experiment requires that the titration be conducted at a pH = 10. How is the solution adjusted to this pH

  Compute the minimum chloride ion concentration

Calculate the minimum chloride ion concentration needed to initiate precipitation of PbCl2 from a solution that contains 0.01M Pb^2+ (aq).

  A mercury thermometer consists of a small glass bulb

a mercury thermometer consists of a small glass bulb containing mercury metal connected to a glass capillary tube. when

  Define isomer out of hexabromobiphenyl

My paper says that will be only one isomer out of hexabromobiphenyl, C12H4Br6 And it states also that one phenyl group is still the active substituent when it is bromized. I wonder why it is only one isomer and I will be so thankful if you can dra..

  Propose an experiment to convert 4-dimethyl-3-pentanol

Propose an experiment to convert 2, 4-dimethyl-3-pentanol to 2, 4-dimethly-3-chloride utilizing HCl and ZnCl2. Parts of the experiment comprise reaction, separation and purification/analysis.

  Explain what is the fraction of association for subsequent

Explain what is the fraction of association for the subsequent potassium propionate solutions. Ignore activities. The Ka of propanoic acid is 1.34 × 10-5.

  What are the molality and mole fraction of solute

What are the molality and mole fraction of solute in a 34.0 percent by mass aqueous solution of formic acid (CH3OH)?

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd