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GrogVix [38]
2 years ago
15

What is the volume, in liters, of 0.500 mol of c3 h8 gas at stp?

Chemistry
1 answer:
saw5 [17]2 years ago
5 0
It's about .0934 Liters at STP. 
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A 20.0 mL of 0.27 M solution of the salt NaA has a pH of 8.70.
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Answer:

a) 3.969

b) 3.489

Explanation:

a) Calculate the pk, value of the acid HA

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P^{H} = 1/2 ( pkw + pka + logC )

8.7 * 2 =  14 + log ( 0.27 )  + Pka

∴ Pka = 3.9686  ≈  3.969

b) Calculate the PH of a solution containing 0.3 M HA and 0.1 M NaA

PH = Pka + log ( salt / acid )

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anyanavicka [17]

Answer:  The percent ionization of CH_3NH_2 in a 0.050 M CH_3NH_2(aq) solution is 8.9 %

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c-c\alpha                       c\alpha            c\alpha

So dissociation constant will be:

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Putting in the values we get:

4.4\times 10^{-4}=\frac{(0.050\times \alpha)^2}{(0.050-0.050\times \alpha)}

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percent ionisation =0.089\times 100=8.9\%

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