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gladu [14]
2 years ago
10

Giving brainly if correct​

Chemistry
2 answers:
Sati [7]2 years ago
8 0
I think that the answer is A.

The rate of flow is basically the speed, and when you measure the speed of a wagon, you don’t wait for the entire vehicle and the trailer to get over the finish line before you stop the timer.
mel-nik [20]2 years ago
3 0

Answer:

The corect answer would be C.

Explanation:

The flow rate set at a differentt time would be the correct measurement beecause wats and speed add up to your main answer.

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What is a mole? not the animal definition lm.ao
LiRa [457]

Answer: Well, a mole is really the same thing. For a chemist, a mole conjures up the number 6.02 times 10 to the 23rd, not a fuzzy little animal. The only difference is that the other quantities are more familiar to us. Lol

Explanation:

4 0
3 years ago
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What is the name of the group that contains elements that are difficult to extract from nature?
Alex787 [66]

Answer:

Alkali metals

Explanation:

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3 years ago
Calculate the pH of a 0.2 M * 4 solution for which Kb = 1.8*10^-5 at 26 c . The equation for the reaction
lara31 [8.8K]

<u>Answer:</u> The pH of the solution is 11.24

<u>Explanation:</u>

We are given:

Molarity of ammonia = 0.2 M

K_b=1.8\times 10^{-5}

The given chemical equation follows:

                NH_3+H_2O\rightleftharpoons NH_4^++OH^-

I:                0.2

C:               -x                      +x        +x

E:             0.2-x                     x          x

The expression for equilibrium constant follows:

K_b=\frac{[NH_4^+][OH^-]}{[NH_3]}

Putting values in above expression, we get:

1.8\times 10^{-5}=\frac{x^2}{0.2-x}\\\\1.8\times 10^{-5}(0.2-x)=x^2\\\\x^2+(1.8\times 10^{-5}x)-(0.36\times 10^{-5})=0\\\\x=1.88\times 10^{-3}, 1.9\times 10^{-3}

Neglecting the negative value of x as concentration cannot be negative.

So, [OH^-]=x=1.88\times 10^{-3}M

pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution.

pOH=-\log [OH^-]

Putting values in above equation, we get:

pOH=-\log (1.88\times 10^{-3})\\\\pOH=2.76

We know:

pH+pOH=14\\\\pH=14-2.76\\\\pH=11.24

Hence, the pH of the solution is 11.24

6 0
3 years ago
Question14 of 20If 5.15 g FeCl3 is dissolved in enough water to make exactly 150.0 mL of solution, what is the molar concentrati
Serhud [2]

Answer: 0.635 M

Explanation:

Molarity : It is defined as the number of moles of solute present per liter of the solution.

Formula used :

Molarity=\frac{n\times 1000}{V_s}

where,

n= Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{5.15g}{162.4g/mol}=0.0317moles  

V_s = volume of solution  = 150 ml

Molarity=\frac{0.0317\times 1000}{150ml}=0.2114M

FeCl_3\rightarrow Fe^{3+}+3Cl^-

as 1 mole of FeCl_3 gives 3 moles of Cl^- ions

Thus molarity of Cl^- = 3\times 0.2114=0.635M

Molarity of Cl^- = 0.635 M

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