B. is positive
H20 (l)--> H20 (g)
when that happens, the heat is absorbed into the liquid to change the state of the liquid to gas; therefore, in order to change to a gaseous state, heat must be a reactant. and so enthalpy is increasing

8 0

2 years ago

If and acid has a Ka dissociation constant of 1 x 10-9 what is the pKa of this acid?

Sphinxa [80]

Answer:

pKa = 9

Explanation:

In this case, we have to remember the meaning of "p". When we use "p" in any calculation we have to apply the minus ten based logarithm, so:

$p~=~-Log$

For example, when we use the "pH" value. We have to apply the minus ten based logarithm of the concentration of the hydronium ion:

$pH~=~-Log[H^+]$

So, if we have wanted to calculate the pKa value. We have to apply the minus ten based logarithm of the Ka value, so:

$pKa~=~-Log~Ka$

Now we can plug the value into the equation:

$pKa~=~-Log~1x10^-^9$

$pKa~=~9$

<u>The pKa value is 9.</u>

I hope it helps!

7 0

2 years ago

How many moles are present in 10.0g aspartame

kifflom [539]

Answer:

Here is the answer:

Explanation:

8 0

3 years ago

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