A 1.0 liter container is filled with 0.300 M ofPCl5 at 250◦C. The vessel is then held at a
constant temperature until the reaction
PCl5(g) ⇀↽ PCl3(g) + Cl2(g)
comes to equilibrium. It is found that the
vessel contains 0.200 moles of PCl5. What is
the value of the equilibrium constant for the
reaction at this temperature?

Answers

Answer 1

Answer: If there is 1.0 liters of 0.300 M at the beginning, that means there was 0.300 moles (because 1 L times 0.300 moles/L = 0.300 mol). It says that, at equilibrium, there is 0.200 mol PCL5. That means 0.100 mol PCl5 reacted. Therefore, 0.100 mol each was created of PCl3 and Cl2.

Equilibrium constant Kc can be found with this:
$K_c= (concentration\ of\ the\ products)/(concentration\ of\ the\ reactants)\nK_c=([PCl_3][Cl_2])/([PCl_5])=((0.100)(0.100))/((0.200))=0.0500$

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What are the key differences between dependent and independent variables? *

Answers

Dependent variables are essentially what you are measuring and is kept the same, and the independent variable is what you change in the experiment

What are the two categories of observations? a. qualitative and quantitative b. direct and indirect c. sensory and derived d. measured and deduced

Answers

Three main approaches are available for observational research: controlled observations, naturalistic observations, and participant observations. The two categories of observation are qualitative and quantitative. The correct option is A.

The observation approach entails watching, either manually or mechanically, what people actually do or what happens when they buy or consume something. Information is gathered by watching processes in action. Observations might be either qualitative or quantitative. Scientists make both qualitative and quantitative observations to acquire knowledge.

Observations that describe something's "qualities" are referred to as qualitative observations. These wouldn't involve counting or measuring and would instead contain qualities like texture, color, and shape. Utilizing standard scales to count or measure is a requirement for quantitative observations.

Thus the correct option is A.

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The correct answer is:

qualitative and quantitative.

Explanation:

Observation is the rapid retrieval of information from a first source. In living beings, observation contracts the senses. In science, observation can also include the recording of data via the use of scientific tools. Qualitative observation is a personal process of collecting data or knowledge while quantitative observation is an objective process of accumulating data or information.

Which of the following compounds will experience dipole-dipole forces of attraction? Cl2
NaCl
H2S
C2H4

Answers

NaCl and H2S will experience dipole-dipole interaction because they are permanently polarized.

NaCl and H2s are the answers

what is the molarity of a concentrated hbr solution if the solution is 27.7% hbr by mass and has a density of 1.24 g/ml

Answers

Answer:
M = No.of moles of solute / Volume of solution in litres
HBr: H = 1 x 1 = 1 Br = 1 x 80
Molar mass : 81 g / mol
a. n = 27.7% / 100 =0.277 g / (81 g / mol) = 0.0034 mol

density = 1.24 g/ml ; D= m / v

b. 65.32 ml x 1 L / 1000 mL = 0.065 L


c. M= n / V
= 0.0034 mol / 0.065 L
M= 0.052 mol / L

The molarity of the concentrated HBr solution is 0.052 mol/L

Gastric juice in the stomach contains pepsin and sulfuric acid.

TrueFalse

Answers

False, pepsin and hydrochloric acid

Answer:

False

Explanation:

it contains pepsin and hydrochloric acid

A gas of 190 mL at a pressure of 74 atm can be expected to change its pressure when its volume changes to 30.0 mL. Express its new pressure in units of atmospheres.

Answers

Answer : The new pressure of the gas will be, 468.66 atm

Explanation :

Boyle's Law : This law states that pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto (1)/(V)$ (At constant temperature and number of moles)

or,

$P_1V_1=P_2V_2$

where,

$P_1$ = initial pressure of the gas = 74 atm

$P_2$ = final pressure of the gas = ?

$V_1$ = initial volume of the gas = 190 ml

$V_2$ = final volume of the gas = 30 ml

Now we put all the given values in the above formula, we get the final or new pressure of the gas.

$74atm* 190ml=P_2* 30ml$

$P_2=468.66atm$

Therefore, the new pressure of the gas will be, 468.66 atm

Answer: The new pressure of the gas is 467 atm.

Explanation:

To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is inversely proportional to the volume of the gas at constant temperature.

The equation given by this law is:

$P_1V_1=P_2V_2$

where,

$P_1\text{ and }V_1$ are initial pressure and volume.