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Tems11 [23]
3 years ago
10

Which matter exists in the gaseous state at room temperature?

Chemistry
2 answers:
Tpy6a [65]3 years ago
3 0
Helium i would think so
padilas [110]3 years ago
3 0
The answer is B. Helium. If you look at the periodic table, Helium is a noble gas, and all noble gases are in the gas phase at room temperature.
Hope this helped ^-^
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Suppose that a newly discovered element called centium has 3 isotopes that occure in nature. These are centium -200, centium -20
vodomira [7]

Answer:

The answer to your question is 203.8 g

Explanation:

Data

Average atomic mass = ?

Centium-200

Centium-203

Centium-209

Equal amounts

Process

1.- Determine the abundance of each isotope.

If they are in equal amounts in nature, just divide 100 by 3

             100/3 = 33.33 % or 0.333

2.- Determine the Average atomic mass

Average atomic mass = Atomic mass 1 x abundance + Atomic mass 2 x

                                        abundance + Atomic mass 3 x abundance

- Substitution

Average atomic mass = 200 x 0.333 + 203 x 0.333 + 209 x 0.333

- Simplification

Average atomic mass = 66.6 + 67.6 + 69.6

Result

Average atomic mass = 203.8 g

3 0
3 years ago
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Yuliya22 [10]
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solids

Explanation:

through solids because the molecules are closer together

4 0
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Read 2 more answers
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