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antoniya [11.8K]
3 years ago
11

How much of a 50g sample of 85Kr will remain after 2 half-lives?

Chemistry
1 answer:
Rashid [163]3 years ago
8 0

Answer:

i need help with my work

Explanation:

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The "Van Gogh" one is subjective, because it expresses opinion and is not a true, hard fact. :)
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Which equation represents the reaction of acetic (ethanoic) acid with water?
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Chemical equation:

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2H2+O2--&gt;2H2O, If you have 9 moles of Hydrogen gas (H2), how many moles of water can you form? (Enter just the number: not th
Naddika [18.5K]

If  you  have  9   moles  of hydrogen gas(H2)  the   moles of water that  can  be formed is   9 moles


<u><em>calculation</em></u>

2H2  +O2→ 2H2O

 The  mole  of H2O  is calculated   using the   mole  ratio.

that  is  H2:H2O  is   2:2  into simple form = 1:1

therefore if 9 moles  of  H2  reacted the   moles of H2O  =  9 x1/1  =  9 moles

8 0
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In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. I
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Answer : The final concentration of the seawater is, 2.909 mole/L

Explanation :

Formula used for osmotic pressure :

\pi=CRT

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\pi = osmotic pressure  = 70.0 bar = 70 atm

R = solution constant  = 0.0821 Latm/moleK

T= temperature of solution = 20^oC=273+20=293K

C = final concentration of seawater = ?

Now put all the given values in the above formula, we get the concentration of seawater.

70atm=C\times 0.0821Latm/moleK\times 293K

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Therefore, the final concentration of the seawater is, 2.909 mole/L

4 0
3 years ago
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