Ask question

Ask question

All categories

2 years ago

5

Which of the following gases is NOT found in Earth’s atmosphere?

2 answers:

netineya [11]2 years ago

5 0

D. all of the above are in the atmosphere

Andrew [12]2 years ago

4 0

The answer is D. All of the above.

You might be interested in

Which of the following correctly describes a compound?

Oksi-84 [34.3K]

I think its c, it makes sense to me to be c

7 0

3 years ago

Read 2 more answers

Periodic table <br> fill in the box :)

Natalija [7]

Answer:

I took a screen shot of your image, and wrote on top of it!

Explanation:

Hope this helps! :)

6 0

2 years ago

In a 51.0-g aqueous solution of methanol ch4o the mole fraction of methanol is 0.270. what is the mass of each component?

gladu [14]

Mole fraction<span> is another way of expressing the concentration of a solution or mixture. It is equal to the </span>moles<span> of one component divided by the total </span><span>moles.

mass CH4O = 0.270 (51) = 13.77 g methanol

water = 51 - 13.77 = 37.23 g water

Hope this answers the question. Have a nice day.</span>

4 0

3 years ago

An unknown compound has the following chemical formula:

Softa [21]

Answer:

Formula of the compound = $P_2O_5$

Explanation:

Given,

No. of mole of O = 8.20 mol

No. of mole of P = 3.30 mol

Chemical formula = $P_2O_x$

Ratio of P and O = $\frac{2}{x}$

$\frac{2}{x} =\frac{3.3}{8.20} \\x \times 3.3 = 8.20 \times 2\\x = \frac{8.20 \times 2}{3.3} \\x=4.9969\\ = 5$

formula of the compound = $P_2O_5$

5 0

3 years ago

what is the predicted order of fist ionization energies from highest to lowest for beryllium, calcium, magnesium, and stronium?

MrRa [10]

Lowest to highest:
Ca
Mg
Be
S

4 0

2 years ago

Read 2 more answers