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nikklg [1K]
3 years ago
13

I will mark brainlist if correct !! :) PLS HELPPP

Chemistry
1 answer:
Soloha48 [4]3 years ago
6 0
<h2>Answer: Option B</h2>

Option A is incorrect. <u>Heated water cannot freeze.</u>

Option B is correct. <u>Heated water will evaporate.</u>

Option C is incorrect. <u>Heated water cannot create condensation.</u>

Option D is incorrect. <u>Water can't melt when heated unless it's been frozen beforehand. </u>

<u />

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A balloon is filled with 3.8 l of helium gas at stp. approximately how many moles of helium are contained in the balloon?
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Air pressure decreases more rapidly with altitude within a column of ________ air than in a column of __________ air.
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If 21.00 mL of a 0.68 M solution of C6H5NH2 required 6.60 mL of the strong acid to completely neutralize the solution, what was
Andru [333]

Answer:

pH = 2.46

Explanation:

Hello there!

In this case, since this neutralization reaction may be assumed to occur in a 1:1 mole ratio between the base and the strong acid, it is possible to write the following moles and volume-concentrations relationship for the equivalence point:

n_{acid}=n_{base}=n_{salt}

Whereas the moles of the salt are computed as shown below:

n_{salt}=0.021L*0.68mol/L=0.01428mol

So we can divide those moles by the total volume (0.021L+0.0066L=0.0276L) to obtain the concentration of the final salt:

[salt]=0.01428mol/0.0276L=0.517M

Now, we need to keep in mind that this is an acidic salt since the base is weak and the acid strong, so the determinant ionization is:

C_6H_5NH_3^++H_2O\rightleftharpoons  C_6H_5NH_2+H_3O^+

Whose equilibrium expression is:

Ka=\frac{[C_6H_5NH_2][H_3O^+]}{C_6H_5NH_3^+}

Now, since the Kb of C6H5NH2 is 4.3 x 10^-10, its Ka is 2.326x10^-5 (Kw/Kb), we can also write:

2.326x10^{-5}=\frac{x^2}{0.517M}

Whereas x is:

x=\sqrt{0.517*2.326x10^{-5}}\\\\x=3.47x10^-3

Which also equals the concentration of hydrogen ions; therefore, the pH at the equivalence point is:

pH=-log(3.47x10^{-3})\\\\pH=2.46

Regards!

6 0
3 years ago
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