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3 years ago

Why is a homogeneous mixture not considered a pure substance?

1 answer:

4 0

The answer is "A. a pure substance can be separated by chemical means, while a mixture can be separated by physical means". A pure substance only has one type of substance, whereas a mixture has more than one. A pure substance therefore, can only be separated chemically, because it is not two things mixed together, whereas a mixture can be separated physically because there are multiple substances.

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Initially, 0.65 mol of PCl5 is placed in a 1.0 L flask. At equilibrium, there is 0.15 mol of PCl3 in the flask. What is the equi

borishaifa [10]

Answer : The equilibrium concentration of $PCl_5$ is, 0.50 M

Explanation : Given,

Initial moles of $PCl_5$ = 0.65 mole

Volume of solution = 1.0 L

Moles of $PCl_3$ at equilibrium = 0.15 mole

The balanced equilibrium reaction will be,

$PCl_5\rightleftharpoons PCl_3+Cl_2$

Initial moles 0.65 0 0

At eqm. (0.65-x) x x

Moles of $PCl_3$ at equilibrium = x = 0.15 mole

Moles of $Cl_2$ at equilibrium = x = 0.15 mole

Moles of $PCl_5$ at equilibrium = (0.65-x) = (0.65-0.15) = 0.50 mole

Now we have to calculate the concentration of $PCl_3,Cl_2\text{ and }PCl_5$ at equilibrium.

Formula used : $Concentration=\frac{Moles}{Volume}$

$\text{Concentration of }PCl_3=\frac{\text{Moles of }PCl_3}{\text{Volume of solution}}=\frac{0.15mole}{1.0L}=0.15M$

$\text{Concentration of }Cl_2=\frac{\text{Moles of }Cl_2}{\text{Volume of solution}}=\frac{0.15mole}{1.0L}=0.15M$

$\text{Concentration of }PCl_5=\frac{\text{Moles of }PCl_5}{\text{Volume of solution}}=\frac{0.50mole}{1.0L}=0.50M$

Therefore, the equilibrium concentration of $PCl_5$ is, 0.50 M

8 0

4 years ago

Consider the diagram below.

Murljashka [212]

I think it’s B energy of the reactants

4 0

4 years ago

Read 2 more answers

can anyone help me with this and if my score is perfect i will brainlist u and follow you and please the answer must be the righ

mario62 [17]

Answer:

1.CL

2.SP

3.CL

4.SL

5.SL

6.SP

7.SL

8.CL

9.SL

10.CL

Explanation:

HOPE ITS HELP

5 0

3 years ago

When you turn on a battery powered flash light you transform what two kinds of energy

Katyanochek1 [597]

A battery transforms two types of energy, chemical energy to electrical energy.

Answer: Chemical and electrical energy

5 0

3 years ago

Read 2 more answers

For the simple decomposition reactionAB(g)→ A(g) + B(g)Rate =k[AB]2 and k=0.2 L/mol*s . How long will it takefor [AB] to reach 1

mixer [17]

Answer:

6.66 s will it take for [AB] to reach 1/3 of its initial concentration 1.50 mol/L.

Explanation:

$Rate = k[AB]^2$

The order of the reaction is 2.

Integrated rate law for second order kinetic is:

$\frac{1}{[A_t]} = \frac{1}{[A]_0}+kt$

Where, $[A_0]$ is the initial concentration = 1.50 mol/L

$[A_t]$ is the final concentration = 1/3 of initial concentration = $\frac{1}{3}\times 1.50\ mol/L$ = 0.5 mol/L

Rate constant, k = 0.2 L/mol*s

Applying in the above equation as:-

$\frac{1}{0.5} = \frac{1}{1.50}+0.2t$

$\frac{1}{1.5}+0.2x=\frac{1}{0.5}$

$t = 6.66\ s$

<u>6.66 s will it take for [AB] to reach 1/3 of its initial concentration 1.50 mol/L.</u>

5 0

3 years ago