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n200080 [17]
3 years ago
9

Is the process of kno3 dissolving in water spontaneous?

Chemistry
1 answer:
Furkat [3]3 years ago
3 0
Yes, it is spontaneous since the reaction is endothermic.
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What is the pH of a 0.050 M triethylamine, (C2H5)3N, solution? Kb for triethylamine is 5.3 ´ 10-4. Question options: 1) 11.69 2)
blsea [12.9K]
<span>the pH of a 0.050 M triethylamine, is 11.70
</span>
For triehtylamine, (C_{2}H_{5})_{3}N, the reaction will be
(C_{2}H_{5})_{3}N + H_{2}O ---\ \textgreater \ ( C_{2}H_{5})_{3}NH^{+} + OH^{-}

 and we know, pH = -log[H+] and pOH = -log[OH-]

Also, pOH + pH = 14

Now, the Kb value  = 5.3 x 10^-4

And kb =  \frac{( [( C_{2}H_{5})_{3}NH^{+} ]*  OH^{-} )}{[( C_{2}H_{5})_{3}N]}

 thus, [OH-] =(5.3 ^ 10-4) ^2 / 0.050

                    =0.00516 M 

Thus, pOH = 2.30 
 pH = 14 - pOH = 11.7
6 0
3 years ago
Lead has a density of 11.3 g/mL. If you have 105 grams of lead,
Elza [17]

Answer:

<h2>Volume = 9.29 mL</h2>

Explanation:

Density of a substance can be found by using the formula

Density( \rho) =  \frac{mass}{volume}

From the question

Density = 11.3 g/mL

mass = 105 g

Substitute the values into the above formula and solve for the volume

That's

11.3 =  \frac{105}{v}

Cross multiply

11.3v = 105

Divide both sides by 11.3

v =  \frac{105}{11.3}

v = 9.29203

We have the final answer as

<h3>Volume = 9.29 mL</h3>

Hope this helps you

6 0
3 years ago
Tina drew an animal cell in her science notebook. What's wrong with the cell?
Lisa [10]

I know for certain, that chloroplast does not belong on that list, chloroplast only belongs inside of plant cells to produce energy required for the plant. I  am not sure about the era or er, but chloroplast does not belong.

Hope this helps, if not, comment below please!

7 0
3 years ago
Choose the compound below that should have the highest melting point according to the ionic bonding model. Choose the compound b
Bingel [31]

Answer:

AlN has highest melting point among given.

Explanation:

As per ionic model, ionic compounds are held together by electrostatic force. The ionic compound having strong electrostatic force will have high melting point.

Electrostatic force is proportional to charge and size of constituent ions.

F=k \frac{q_+\times q_-}{r^2}

In case of MgO

Charge on Mg = +2

Charge on O = -2

F=-k \frac{(+2)\times (--2)}{r^2}=\frac{4k}{r^2}

In case of LiF

Charge on Li = +1

Charge on F = -1

F=-k \frac{(+1)\times (-1)}{r^2}=\frac{1k}{r^2}

In case of AlN

Charge on Al = +3

Charge on N = -3

F=-k \frac{(+3)\times (-3)}{r^2}=\frac{9k}{r^2}

In case of RbF

Charge on Rb = +1

Charge on F = -1

F=-k \frac{(+1)\times (-1)}{r^2}=\frac{1k}{r^2}

In case of CaS

Charge on Ca = +2

Charge on S = -2

F=-k \frac{(+2)\times (-2)}{r^2}=\frac{4k}{r^2}

As magnitude of electrostatic force is highest in AlN, therefor, it has highest melting point.

4 0
3 years ago
You have decided to do a science fair project involving plants. Which of the following represents a well-stated hypothesis?
marysya [2.9K]
The correct answer should be c
8 0
3 years ago
Read 2 more answers
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