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Valentin [98]
3 years ago
9

What is the volume of 1.5 moles of oxygen gas at standard temperature and pressure (STP)?

Chemistry
2 answers:
den301095 [7]3 years ago
5 0
The correct answer is 35L
Maurinko [17]3 years ago
5 0

Answer : The correct option is, 34 L

Explanation : Given,

Moles of oxygen gas = 1.5 mole

As we know that,

At standard temperature and pressure (STP), 1 mole of gas contains 22.4 liters volume of gas

As, 1 mole of oxygen gas contains 22.4 liters volume of oxygen gas

So, 1.5 mole of oxygen gas contains 1.5\times 22.4=33.6L\approx 34L volume of oxygen gas

Therefore, the volume of oxygen gas at standard temperature and pressure (STP) is, 34 L

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1. Which of the following nuclear equations is correctly balanced? (choices attached)
lawyer [7]

1. <em>Balancing nuclear equations </em>

Answer:

_{18}^{37}\text{Ar} + _{-1}^{0}\text{e} \rightarrow _{17}^{37}\text{Cl}

Explanation:

The main point to remember in balancing nuclear equations is that the <em>sums of the superscripts</em> (the mass numbers) and the <em>subscripts</em> (the nuclear charges) <em>must balance</em>.

Mass numbers: 37 + 0 = 37; balanced.

Charges: 18 + 1 = 17; balanced

B is <em>wrong</em>. Mass numbers not balanced. 6 +2(1) ≠ 4 + 3.

C is <em>wron</em>g. Mass numbers not balanced. 254 + 4 ≠ 258 + 2(1).

D is <em>wron</em>g. Mass numbers not balanced. 14 + 4 ≠ 17 + 2.

===============

2. <em>Amount remaining </em>

Answer:

D. 5.25 g

Explanation:

The half-life of Th-234 (24 da) is the time it takes for half the Th to decay.  

After one half-life, half (50 %) of the original amount will remain.  

After a second half-life, half of that amount (25 %) will remain, and so on.

We can construct a table as follows:  

  No. of                  Fraction       Amount  

<u>half-lives</u>   <u>t/(da</u>)  <u>remaining</u>  <u>remaining/g</u>  

      1             24            ½                21.0  

      2            48            ¼                10.5  

      3             72           ⅛                 5.25  

      4             96          ¹/₁₆                 2.62  

We see that 72 da is three half-lives, and the amount of Th-234 remaining is 5.25 g.  

===============

3.<em> Calculating the half-life </em>

Answer:

a. 2.6 min

Explanation:

The fraction of the original mass remaining is 1.0 g/4.0 g ≈ ¼.

We saw from the previous table that it takes two half-lives to decay to ¼ of the original amount.

2 half-lives = 5.2 min       Divide both sides by 2

  1 half-life = 5.2 min/2 = 2.6 min

7 0
2 years ago
Select the options that are properties of electromagnetic waves:
kaheart [24]

Answer:

They propagate in materialistic media and non-materialistic media ( space ) .

They propagate in the space at constant velocity , which is 3 × 108 m/s .

They consist of vibrating electric and magnetic fields at certain frequency in phase with each other , perpendicular to each other and perpendicular to the direction of the wave propagation ...

Explanation:

welcome!

4 0
3 years ago
I need an answer now please asap and you will me marked brainiest please it's missing I need it now.
kogti [31]

Answer:

Molecular Mass:

1. 40g per mole

2. 19g per mole

3. 64g per mole

4. 32 g per mole

5. 17g per mole

6. 59.5g per mole

7.58.5 g per mole

8.220g per mole

9. 78g per mole

10. 200g per mole

Explanation:

Molecular Mass = Number of atom x atomic mass of an element

Your Welcome~

8 0
2 years ago
What would be the coefficient of the NaOH molecule in the balanced equation?
Scilla [17]
2NaOH=Na2O +H2O
The coefficient of NaOH is 2
6 0
3 years ago
What is your calculated density of water at R.T.?
Alekssandra [29.7K]
The mass of 40 mL of water is 40 grams. Since D = m/v and mL = cm3, the density of water is 1 g/cm3. Choose a volume between 1 and 100 mL. Use your graph to find the mass.
3 0
3 years ago
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