Which one of the following is a base?A. HCI B.Cu(OH)2 C.HNO3 D.HC2H3O2

Chemistry

2 answers:

bulgar [2K]3 years ago

8 0

Answer:

Option B - Cu(OH)2. is your answer.

DedPeter [7]3 years ago

5 0

Answer:

b. Cu(OH)2

Explanation:

As it is having Hydroxil ions(OH).

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the vapor pressure of a naqueous solution is found to be 24.9 mmgh at 25C. what is the mole fraction of solute in this solution?

Gekata [30.6K]

Answer:

Mole fraction of solute is 0.0462

Explanation:

To solve this we use the colligative property of lowering vapor pressure.

First of all, we search for vapor pressure of pure water at 25°C = 23.8 Torr

Now, we convert the Torr to mmHg. Ratio is 1:1, so 23.8 Torr is 23.8 mmHg.

Formula for lowering vapor pressure is:

ΔP = P° . Xm

Where ΔP = P' (Vapor pressure of solution) - P° (Vapor pressure of pure solvent)

Xm = mole fraction

24.9 mmHg - 23.8 mmHg = 23mmHg . Xm

Xm = (24.9 mmHg - 23.8 mmHg) / 23mmHg

Xm = 0.0462

8 0

3 years ago

In the first 85.0 s of this reaction, the concentration of no dropped from 1.12 m to 0.520 m . calculate the average rate of the

goldenfox [79]

In the first 85.0 s of this reaction, the concentration of no dropped from 1.12 m to 0.520 m .

What is rate of a reaction?

The speed at which a chemical reaction takes place is the rate of the reaction. It is the concentration change per unit time of a reactant in a reaction.

Since the concentration of NO reduces to half its initial concentration in 85 seconds that is from 1.12m to 0.520m, it can be said that 85 seconds is the half life interval for the reaction, Hence on average, half reaction is completed in the time interval of 85 seconds.

To learn more about rate of a reaction from the given link below,

brainly.com/question/12172706

#SPJ4

7 0

2 years ago

Last question for this subject- 50 POINTS!!!

Anna11 [10]

Answer: Chemical and Potential Energy

Explanation: Im pretty sure that is it i know it is Chemical and Potential Good Luck Hope I helped. =)