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Ulleksa [173]
3 years ago
15

Which statement about a novel's setting iscorrect? 

Chemistry
1 answer:
den301095 [7]3 years ago
4 0
A. It can be as important to a story as a character
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1) The heat of combustion for the gases hydrogen, methane and ethane are −285.8, −890.4 and −1559.9 kJ/mol respectively at 298K.
Morgarella [4.7K]

Answer:

The enthalpy of the reaction is 64.9 kJ/mol.

Explanation:

H_2 + \frac{1}{2}O_2\rightarrow H_2O,\Delta H_1 =-285.8 kJ..[1]

CH_4 + 2O_2\rightarrow CO_2 + 2H_2O,\Delta H_2 =-890.4 kJ..[2]

C_2H_6 + \frac{7}{2}O_2\rightarrow 2CO_2 + 3H_2O,\Delta H_3= -1559.9 kJ..[3]

2CH_4(g)\rightarrow C_2H_6(g) + H_2(g),\Delta H_4=?..[4]

2 × [2] - [1]- [3] = [4]  (Using Hess's law)

\Delta H_4=2\times \Delta H_2 -\Delta H_1 -\Delta H_3

\Delta H_4=2\times (-890.4 kJ)-(-285.8 kJ) -(-1559.9 kJ)

\Delta H_4=64.9 kJ/mol

The enthalpy of the reaction is 64.9 kJ/mol.

3 0
3 years ago
Design an experiment for molar mass using research skills
nexus9112 [7]
Chemistry is a very hard subject in my opinion
7 0
3 years ago
What is the ph of a solution with hydrogen ion concentration of 0.001m?
lys-0071 [83]
Find the pH using the concentration of hydrogen ions [H+] of 0.001M (molarity) by taking the negative log of the value:

-log[H+]=pH
-log[0.001] = pH
-log[1x10^-3]=pH
3=pH
6 0
3 years ago
1) What is one way you and your family can help to conserve water at home? A) washing dishes on a full cycle B) using the longes
gayaneshka [121]

Answer:

the answer is b

Explanation:

4 0
3 years ago
Read 2 more answers
When you live in a cold place and you're planning a vacation for February, are you interested in a location's weather or climate
Dahasolnce [82]

Answer:

It depends on what type of environment you are looking for. If you are looking for a warmer climate, warm weather and temperature is important. If you are looking for a cooler climate, you should look for colder weather and temperature. Humidity, geographical location, plant growth and foliage and elevation are also important when looking for a place to vacation.

Explanation:

5 0
3 years ago
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