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Pachacha [2.7K]
3 years ago
13

A set of four 15.0-mL solutions—each in a similar open dish—was left at room temperature, and the amount that remained was recor

ded after every hour. Which of the solutions do you expect to be the first to completely evaporate from the open dish?
1.5 m NaOH
1.0 m NaOH
0.5 m Na2SO4
0.25 m Na2SO4
Mathematics
2 answers:
allochka39001 [22]3 years ago
5 0
Using Raoult's law, we know that the vapour pressure of a solution is the mole fraction of the solvent.
The mole fraction of solvent increases as the mole fraction of solute decreases.  For the present case, the mole fraction of the solvent increases as the number of moles of the solute decreases.

We also know that the higher the solvent vapour pressure, the faster it will dry out, everything else being equal (e.g. presence of drafts, temperatures, etc).

So the fastest evaporating solution is the one with the least mole of solute, namely 0.25 M Na2SO4, since this has the lowest molarity among the four solution, and hence the highest solvent vapour pressure.

Note: This question does not require math, but more chemistry is involved.  Posting in the right section will net you correct answers faster, in the future.

Gennadij [26K]3 years ago
4 0
<span>0.25 m Na2SO4 just finished the test</span>
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Which of the following notations correctly describe the end behavior of the polynomial graph below?
ipn [44]

The end behaviour of the polynomial graph is (b) x ⇒ +∝, f(x) ⇒ -∝ and x ⇒ -∝, f(x) ⇒ -∝

<h3>How to determine the end behaviour of the polynomial graph?</h3>

The polynomial graph represents the given parameter

This polynomial graph is a quadratic function opened downwards

Polynomial function of this form have the following end behaviour:

  • As x increases, f(x) decreases
  • As x decreases, f(x) decreases

This is represented as

x ⇒ +∝, f(x) ⇒ -∝ and x ⇒ -∝, f(x) ⇒ -∝

Hence, the end behaviour is (b)

Read more about end behaviour at

brainly.com/question/1365136

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7 0
1 year ago
The sum of two numbers is 56, and their difference is 10. What are the numbers?
Elanso [62]

Answer:

23 and 33

Step-by-step explanation:

23+33=56

33-23=10

6 0
3 years ago
Read 2 more answers
SOMEONE PLZZZ HELP ME THIS IS DUE IN LIKE 5 MINS (I WILL MARK BRAINLIEST)
andrew-mc [135]

Answer:

1) x = 8

2) ∠RPS = 36°

Step-by-step explanation:

<u>GIVEN :-</u>

  • ∠QPS = 180°
  • ∠QPR = 7x + 88
  • ∠RPS = 3x + 12

<u>TO FIND :-</u>

  1. Value of x
  2. Measure of ∠RPS

<u>FACTS TO KNOW BEFORE SOLVING :-</u>

In a straight line , if there are two angles such that their sum is equal to straight angle (or 180° in other words) , then those angles are known as linear pair.

<u>PROCEDURE :-</u>

1)

Measure of ∠QPS = 180° and it comprises of ∠QPR & ∠RPS.

⇒ ∠QPR & ∠RPS are linear pair.

⇒ ∠QPR + ∠RPS = 180°

⇒ 7x + 88 + 3x + 12 = 180°

⇒ 10x + 100 = 180

⇒ 10x = 180 - 100 = 80

⇒ x = 80/10 = 8

2)

x = 8. So,

∠RPS = 3×8 + 12 = 24 + 12 = 36°

8 0
3 years ago
Number 7 using algorithm
aniked [119]
Sorry it says plus but its times

6 0
3 years ago
Which situation would not be represented by the integer -9?
Aneli [31]
The correct answer would be

A football pass of 9 yards
6 0
2 years ago
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