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8090 [49]
4 years ago
11

SELECT ALL THAT APPLY

Chemistry
2 answers:
Scilla [17]4 years ago
3 0
At STP conditions, 0.25 moles of CO2(g), H2(g), NH3(g)

The answers are:
<span>1. Will contain the same number of molecules </span>
3. Will occupy the same volume

koban [17]4 years ago
3 0

<u>Answer:</u> The correct answer is Option 1 and Option 3.

<u>Explanation:</u>

We are given:

0.25 moles of CO_2,H_2\text{ and }NH_3

STP conditions states that 1 mole of a gas occupies 22.4 L of volume.

The volume occupied by all the gases at STP will be 0.25\times 22.4=5.6L

According to mole concept: 1 mole of a compound contains 6.022\times 10^{23} number of molecules or 1 mole of an element contains 6.022\times 10^{23} number of atoms.

We know that the given gases are compounds. Thus, all the three gases will have 0.25\times 6.022\times 10^{23}=1.5055\times 10^{23} number of molecules.

Hence, the correct answer is Option 1 and Option 3.

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Can someone help.? thanks :)​
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Answer:

  • <u>1. Equation: 2x  + 3 = 9x - 11</u>

<u></u>

  • <u>2. Each row has 2 chairs</u>

Explanation:

The variable x represents the number of chairs in each row.

<u />

<u>1. She can form 2 rows of a given length with 3 chairs left over.</u>

Thus, she has:

number of rows  number of chairs in      chairs             number of chairs

                             each row                       left over         she has

     2                        x                                    3                      2x + 3

<u>2.  She can form 9 rows of the same length if she gets 11 more chairs.</u>

That means that she is short in 11 chairs to have 9x chairs, or that she has 11 less chairs than 9x chairs. Then she has:

  • 9x - 11

<u>3. Equation:</u>

Then, number of chairs she has is 2x + 3 and, also, 9x - 11, which allows to set the equation:

  • 2x + 3 = 9x  -11

<u>4. Solve the equation:</u>

  • 9x - 2x = 3 + 11
  • 7x = 14
  • x = 2

Therefore, each row has 2 chairs, and she has 2x + 3 = 4 + 3 = 7 chairs.

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3 years ago
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