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yaroslaw [1]
4 years ago
13

When 25.0 grams of solid potassium hydroxide (KOH, molar mass = 56.1 g/mol) is dissolved in 100.0 grams of water, the solution i

ncreases in temperature by 61.5ºC. What is the molar heat of solution (ΔH) for potassium hydroxide in kJ/mol?
Remember that the mass of the solid is not added to the mass of the liquid to determine the mass of the solution. Just use the mass of the water.

q=CpmΔT and Cp for H2O = 4.18 J/gºC

Select one:
a. +57.7 kJ/mol
b. -1.03 kJ/g
c. -57.7 kJ/mol
d. 57700 J/mol
Chemistry
1 answer:
Maru [420]4 years ago
4 0

Answer:

They gave you the equation; Cp=,

just plug everything in! You’ve seen this; I have long ago, but we had different units. Sorry, but it’s right there! Go get it!

Explanation:

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List four observations that suggest chemical change is occurring
allsm [11]

Answer:

Examples of Chemical Changes

Burning wood.

Souring milk.

Mixing acid and base.

Digesting food.

Cooking an egg.

Heating sugar to form caramel.

Baking a cake.

Rusting of iron.

8 0
3 years ago
The maximum number of electrons in each type of sublevel (s, p, d, and f, respectively
Soloha48 [4]
S = 2
p = 6
d =10 
f = 14
6 0
3 years ago
WHY IS IT IMPORTANT TO HAVE A LARGE SAMPLE SIZE IN ANY EXPERIMENT?
Anon25 [30]
It is important because if the sample size is smaller, outliers could skew the data more than if it was large.
5 0
3 years ago
Which profile best describes the reaction C(s) + 2H2(g) → CH4(g),<br> AH = -74.9 kJ?
katrin [286]

Answer:

Option B. A

Explanation:

From the question given above, the following data were obtained:

C(s) + 2H₂ (g) —> CH₄ (g). ΔH = –74.9 kJ

From the reaction above, we can see that the enthalpy change (ΔH) is negative (i.e –74.9 KJ) which implies that the heat content of the reactants is greater than the heat content of the products. Thus, the reaction is exothermic reaction.

For an exothermic reaction, the energy profile diagram is drawn in such a way that the heat content of reactants is higher than the heat content of products because the enthalpy change

(ΔH) is always negative.

Thus, diagram A (i.e option B) gives the correct answer to the question.

8 0
3 years ago
Read 2 more answers
CH4(g) + H2O(g) CO(g) + 3H2(g)
boyakko [2]
Presuming the arrow is between H20 and CO

On the left there are 2 gas moles.
On the right there are 4 gas moles.

The equilibrium will shift to the side with the most no. He gas moles when pressure is decreased.

Therefore the answer is A, since 4>2.

If you have any questions, feel free to ask
5 0
3 years ago
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