4) How do suifur's properties change during this reaction?

he chlorination of methane occurs in a number of steps that results in the formation of chloromethane and hydrogen chloride. The

frez [133]

Answer:

The total pressure in the flask is 0,619 atm.

Explanation:

For the reaction:

2CH₄(g) + 3Cl₂(g) → 2 CH₃Cl(g) + 2HCl(g) + 2Cl⁻(g)

The moles of CH₄ in 295 mL at STP are:

n = PV/RT

Where P is pressure (1 atm), V is volume (0,295L), R is gas constant (0,082atmL/molK) and T is temperature (273,15 K)

Replacing, moles of CH₄ are 0,0132 moles

In the same way, moles of chlorine are 0,0324 moles

As 3 moles of Cl₂ react with 2 moles of CH₄, for a total reaction of 0,0132 moles of CH₄ you need:

0,0132 moles CH₄ × $\frac{3 mol Cl_{2}}{2 mol CH_{4}}$ = 0,0198 moles Cl₂. That means that 0,0324-0,0198 = -0,0126 moles of Cl₂ are in excess-.

As the reaction reaches in 77%, the moles of CH₄ that don't react are:

0,0132×(100%-77%)= 3,036x10⁻³ moles of CH₄

Also, the moles of Cl₂ that don't react are:

0,0126 + 0,0198×(100%-77%)= 0,0172 moles of Cl₂

The moles produced of each compound are:

0,0132×77% moles × $\frac{2 mol CH_{3}Cl}{2 mol CH_{4}}$ = 0,0102 moles of CH₃Cl -that are the same moles of HCl and Cl⁻-

Thus, total moles in the flask are:

3,036x10⁻³ moles of CH₄ + 0,0172 moles of Cl₂ + 0,0102 moles of CH₃Cl + 0,0102 moles of HCl + 0,0102 moles of Cl⁻ = 0,0507 total moles

As the volume of the flask is 2,00L and the final temperature is 298 K. The total pressure in the flask is:

P = nRT/V

P = 0,619 atm

I hope it helps!

5 0

3 years ago

Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode

Dvinal [7]

Answer:

468 h

Explanation:

Let's consider the reduction of chromium (III) to chromium that occurs in the electrolytic purification.

Cr³⁺ + 3 e⁻ → Cr

We can establish the following relations.

1 kg = 1,000 g
The molar mass of Cr is 52.00 g/mol
1 mole of Cr is deposited when 3 moles of electrons circulate
The charge of 1 mole of electrons is 96,468 c (Faraday's constant)
1 A = 1 c/s
1 h = 3,600 s

The hours that will take to plate 11.5 kg of chromium onto the cathode if the current passed through the cell is held constant at 38.0 A is:

$11.5kgCr \times \frac{1,000gCr}{1kgCr} \times \frac{1molCr}{52.00gCr} \times \frac{3mole^{-} }{1molCr} \times \frac{96,468c}{1mole^{-}} \times \frac{1s}{38.0c} \times \frac{1h}{3,600s} = 468 h$

6 0

3 years ago

An isomer with a branched structure will require: more energy to melt than the straight chain structure a higher temperature to

Oxana [17]

Correct answer: An isomer with a branched structure will require: less energy to melt than the straight chain structure.

Reason:

The branched chain compounds have lower melting and boiling points as compared to straight chain isomers.This is due to the fact that branching makes the molecule more compact. This results in decreases in surface area of isomer. But, the intermolecular attractive forces depends on the surface area of compound. Thus, branched isomers have lower intermolecular force of interaction, as compared to straight chain isomers. Consequently, the melting/boiling points of the branched chain isomers are lower as compared to straight chain isomers.

3 0

3 years ago

HELP what is it is it 1,2 or 3

andre [41]

Answer:

ok so for the first question your answer is positive since North is defined as positive. can you show me 2 and 3 so i can answer them in the comments

Explanation:

6 0

3 years ago

Read 2 more answers

The blank of an element is the average mass of all isotopes of that element

Oxana [17]

Atomic mass is the answer

if u hav any more questions in chemistry ask me! I am very good at chemistry.

6 0

3 years ago

4) How do suifur's properties change during this reaction?​

4) How do suifur's properties change during this reaction?