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Yakvenalex [24]
2 years ago
6

A box of nine iPhone 5C cellphones (the iPhone “for the colorful”) contains two yellow cellphones and seven green cellphones. (a

) If two cellphones are randomly selected from the box, without replacement (the first cellphone is not returned to the box after it is selected), what is the probability that both cellphones selected will be green? (b) If two cellphones are randomly selected from the box, without replacement (the first cellphone is not returned to the box after it is selected), what is the probability that there will be one yellow cellphone and one green cellphone selected? (c) If three cellphones are selected, with replacement (the first cellphones are returned to the box after it is selected), what is the probability that all three will be yellow? (d) If you were sampling with replacement (the first cellphone is returned to the box after it is selected), what would be the answers to (a) and (b)? 3
SAT
1 answer:
fenix001 [56]2 years ago
8 0
On it uioooopliuiioiuyyukkppoloowp we o ok G G ooui a no saS as as sAqqa awe we e it
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A 20.0-ml sample of a 0.200 mhbr solution is titrated with a 0.200 mnaoh solution. calculate the ph of the solution after the fo
kumpel [21]

The calculated pH of the solutions are given below:

  • The pH of the solution after 14.0 ml of base is added to it is calculated as 1.45.
  • The pH of the solution after 19.8 ml of base is added to it is calculated as 3.0
  • The pH of the solution after 20.0 ml of base is added to it is calculated as 7.

<h3>What is pH?</h3>

This is the level of acidity or alkalinity of an aqueous solution. The pH of a substances tells if its an acid, base or neutral.

HBr and NaOH while in water would dissociate and they would become H+ and OH- respectively.

Mol of HBr = Mol * Vol

= 0.200 * 20mL

= 4 mmol

A. Moles of NaOH added

= 0.2 X 14

= 2.8 mmol

Moles of H+ that did not react

= 4 - 2.8

= 1.2 mmol

1.2/1000 = 0.0012 moles

Total volume = 20 + 14

= 34 mL to litres

= 0.034 L

Molarity of H+ = 0.0012 / 0.034L

= 0.035 M

-log[0.035] = 1.45

The pH of the solution is  1.45

B. NaOH added = 19.8 * 0.2 =

3.96 mmoles

The unreacted solution

= 4.0 - 3.96

= 0.04 mmol

0.04/1000 = 0.00004 moles

Total volume = 20 + 19.8

= 39.8mL

Converted to litres = 0.0398L

Molarity  = 0.00004 / 0.0398L

= 0.001

-log(0.001) = 3.0

The ph Is therefore 3.0

C. Moles of NaOH added = 0.2*20mL = 4mmol

All the H+ are going to be consumed here. This would result into a neutral solution pH = 7

<u>Complete question:</u>

20.0 mL sample of 0.200 M HBr solution is titrated with 0.200 M NaOH solution. Calculate the PH of the solution after the following volumes of base have been added.

A. 14.0 mL

B. 19.8 mL

C. 20.0 mL

Read more on pH here; brainly.com/question/22390063

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Reaction of hydrazine with ethanal ​
Tasya [4]
It produces a hydrazone in which the carbon is attached with the nitrogen atom with the means of a double bond.
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PLEASE HELP! I WILL MARK BRAINLIEST!!!! 10 points on the line!!!!!
taurus [48]
The correct answer is C

We are solving for C so we need to isolate C

Multiply 2 to both sides

2W = CV^2

Divide V^2

C = 2W/V^2
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An object emits as much radiation than it absorbs. How would you expect the temperature of this object to change?.
olchik [2.2K]

Answer: Objects that are warmer emit more energetic radiation than those that are cooler and so they cool faster. Therefore, in the absence of an external heat ...

Explanation:

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Answer: The independent variable is the cause.  so choose the cause

Explanation:

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