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likoan [24]
3 years ago
7

4 mol of water is made up of 2.408×10^24 molecules of water.

Chemistry
1 answer:
zhenek [66]3 years ago
6 0
It would be 20 give me bravest
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If air contains 78% Nitrogen by volume, what is the solubility of nitrogen in water at 25 degree celisus​
Svet_ta [14]

The solubility of nitrogen in water at 25 °C= 4.88 x 10⁻⁴ mol/L

<h3>Further explanation</h3>

Given

78% Nitrogen by volume

Required

The solubility of nitrogen in water

Solution

Henry's Law states that the solubility of a gas is proportional to its partial pressure  

Can be formulated  

S = kH. P.  

S = gas solubility, mol / L  

kH = Henry constant, mol / L.atm  

P = partial gas pressure  

In the standard 25 C state, the air pressure is considered to be 1 atm, so the partial pressure of N₂ -nitrogen becomes:

Vn / Vtot = Pn / Ptot

78/100 = Pn / 1

Pn = 0.78 atm

Henry constant for N₂ at 25 °c = 1600 atm/mol.L=6.25.10⁻⁴ mol/L.atm

The solubility :

\tt S=6.25.10^{-4}\times 0.78\\\\S=4.88\times 10^{-4}~mol/L

7 0
2 years ago
How many moles are there in 987 grams of Ra(OH)2? id also love to know the simplest equation for converting moles --&gt; so i co
OlgaM077 [116]
Mole = \frac{mass}{molar mass}

Mass of Radium Hydroxide = 987g
Molar Mass of Ra(OH) _{2} = ((226) + (2 * 16) + (2 * 1))
                                            =  260 g / mol

∴  Moles of <span>Ra(OH) _{2} = </span>\frac{987 g }{ 260 g / mol }
                                            = 3.796 mols
6 0
3 years ago
Which statements are correct about Avogadro’s constant?
abruzzese [7]

Answer:

Explanation:

I,II, and III

5 0
3 years ago
HELP! 10 pts!! || Which does NOT describe a water molecule?
AVprozaik [17]

Answer:

C.)

Explanation:

Hope this helps:)

5 0
3 years ago
How many protons do calcium have
Vsevolod [243]
A calcium atom has 20 protons!

There you go! I really hope this helped, if there’s anything just let me know! ☻
6 0
3 years ago
Read 2 more answers
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