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Anuta_ua [19.1K]
2 years ago
9

Can you please help solve and explain the steps for the calculation?

Chemistry
1 answer:
Nimfa-mama [501]2 years ago
8 0

Answer:

The hydrogen ion concentration in a solution, [H+], in mol L-1, can be calculated if the pH of the solution is known.

pH is defined as the negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 pH = -log10[H+] ...

[H+] in mol L-1 can be calculated using the equation (formula): [H+] = 10-pH

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Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol. What is the expected value for the he
photoshop1234 [79]

Answer: 35.1 kJ/mol

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

CH_3COOH(s)\rightarrow CH_3COOH(l)    \Delta H_{fusion}=10.8kJ/mol   (1)

CH_3COOH(l)\rightarrow CH_3COOH(g)    \Delta H_{vap}=24.3kJ/mol   (1)

The final reaction is:  

CH_3COOH(s)\rightarrow CH_3COOH(g)  \Delta H_{sub}=?   (3)

By adding (1) and (2)

\Delta H_{sub}=\Delta H_{fusion}+\Delta H_{sub}=+10.8kJ+(+24.3kJ)=35.1kJ

Hence the expected value for the heat of sublimation of acetic acid is 35.1 kJ/mol

6 0
3 years ago
HELPPPP I NEED TO SEND THEM TO MY TEACHER ITS REACTIONS AND SOME OF THEM MIGHT CANT HAPPEN
Volgvan

Answer:

Explanation:

follow the rule of "a weak acid can't make a stronger acid and weak base can't make a stronger base(it's pretty accurate for acid/salt reactions/replacemnts)" the last reactions won't work, but the second to last one will be kbr+pb(no3)2-> kno3 + PbBr2 (this is unballanced.) the first reaction will work. the second one i'm not too sure tbh, but i think it won't work since barium hydroxide's a weak base and if it were to react it would make koh, a super strong base

5 0
2 years ago
Read 2 more answers
Can arsenic be broken down by a chemical change
anygoal [31]
Arsenic is a pure element. Elements (atoms) are the simplest building blocs excluding smaller elementary particles such as electrons, neutrons, quarks, protons etc. 

This means that Arsenic can not be broken down any further by chemical change, only nuclear decay can cause the breakdown of large elements into smaller ones. Chemical change would be the combination of multiple elements into a compound or the decomposition of a molecule/compound into pure elements or smaller compounds. 
7 0
3 years ago
Need help on 13 and 17. The picture covers number 13, the question in number 17 is “Where do you think Styrofoam would be on the
Dennis_Churaev [7]

Answer:

  • 13. We see a left skewed data trend with a parabolic nature. The speed of conductivity increases as the material become more conductive, such that copper is the most condutive material compares to copper, and copper compared to plastic shows low conductivity.
  • 17. Styrofoam is a mixture of plastics and hence is an insulator such that Q(dot) can be 0 in an ideal system. So it can conduct better than plastic such that it should be above plastic due to the insulation properties.
4 0
2 years ago
12 points
sleet_krkn [62]

Answer:

C. Theories have been confirmed through tests; hypotheses haven't.

Explanation:

In simple terms,<u> a theory is something that has been studied, tested, and validated with results</u> whereas <u>a hypothesis is when one "guesses" or "assumes" about something with no prior tests</u>. In short, a hypothesis can be best understood as just a proposal while theory can be taken as a validated result.

Through various trials and tests, a theory arrives whereas a hypothesis can be the initial stage of the testing. For example, in saying that "My hypothesis is that this metal cannot bend" is just assuming or expressing one's opinion. But when the metal is tested and a definite result is found, then that becomes a theory.

So, we can say that a theory is a confirmed result after tests while a hypothesis is not tested or confirmed with a definite result.  

Thus, the <u>correct answer is option C. </u>

7 0
3 years ago
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