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Effectus [21]
3 years ago
13

What are the 11 chemical elements that are gases at room temperature and pressure?

Chemistry
1 answer:
sineoko [7]3 years ago
5 0
Oxygen hydrogen helium argon xenon krypton
neon nitrogen radon chlorine bromine fluorine
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0.28gram of NH3 on decomposition gave 0.25gram of nitrogen and hydrogen. Find the volume of hydrogen evolved at Ntp. (2gram hydr
hodyreva [135]

The volume of H₂ evolved at NTP=0.336 L

<h3>Further explanation</h3>

Reaction

Decomposition of NH₃

2NH₃ ⇒ N₂ + 3H₂

conservation mass : mass reactants=mass product

0.28 NH₃= 0.25 N₂ + 0.03 H₂

2 g H₂ = 22.4 L

so for 0.03 g :

\tt \dfrac{0.03}{2}\times 22.4=0.336

7 0
3 years ago
A chromate ion consist of four oxygen atom bonded to be a chromium atom. It has two extra electrons. the formula for this
natali 33 [55]

Answer:

Cr04^2-

Explanation:

 

6 0
3 years ago
What atom has the largest atomic radius barium calcium magnesium radium
iogann1982 [59]

Answer:

Radium

Explanation:

It has the highest atomic number so it would have more shells, making it larger than the others.

6 0
3 years ago
Can someone please help me with this question
Licemer1 [7]

Answer:

the second one I think...

4 0
3 years ago
Read 2 more answers
If carbon-15 has a half-life of 2.5 seconds, % of the sample would still be
kramer

Answer:

After 5 second 25% C-15 will remain.

Explanation:

Given data:

Half life of C-15 = 2.5 sec

Original amount = 100%

Sample remain after 5 sec = ?

Solution:

Number of half lives = T elapsed / half life

Number of half lives = 5 sec / 2.5 sec

Number of half lives = 2

At time zero = 100%

At first half life = 100%/2 = 50%

At second half life = 50%/2 = 25%

Thus after 5 second 25% C-15 will remain.

8 0
3 years ago
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