1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katen-ka-za [31]
3 years ago
15

A 100.00 ml of volume of 0.500 M HCl was mixed with 100.00 ml of 0.500 M KOH in a constant pressure calorimeter. The initial tem

perature of individual acid and base was 23.0 oC. The final temperature after mixing was 25.5 oC. The specific heat of the solution was 3.97 J g-1 oC-1 Assume the density of the solution is 1.00 g mL-1 a) Calculate the heat of the reaction in kJ. (Be sure to use signs correctly.) b) Calculate the enthalpy of the reaction in kJ/mol. (Be sure to use signs correctly.) DO NOT put units in the answer box or your answer will be counted wrong.
Chemistry
1 answer:
Virty [35]3 years ago
7 0

Answer:

The heat of the reaction = -1985 J = -1.985 kJ

The enthalpy of the reaction is -39.7 kJ/ mol

Explanation:

<u>Step 1: </u>Data given

Volume of HCl = 100 mL the heat of the reaction = 0.1 L

Molarity of HCl solution = 0.500 M

Volume of KOH = 100 mL = 0.1 L

Molarity of KOH solution = 0.500 M

Initial temperature = 23.0 °C

Final temperature = 25.5 °C

Specific heat of the solution = 3.97 J/°C *g

Density of the solution = 1g/ mL

<u>Step 2: </u>Calculate heat

Q = m*c*ΔT

with m = the mass of both solution : 100g + 100 g ( since density = 1g/mL) = 200 g

c = the specific heat = 3.97 J/°C*g

ΔT  = T2 -T1 = 25.5 = 23 = 2.5 °C

Q = 200g *3.97 J/°C*g * 2.5°C = 1985 J  (= -1985 J because it's exothermic)

<u />

<u>Step 3:</u> Calculate the number of moles

Number of moles = Molarity * Volume

Number of moles = 0.5 * 0.1 L = 0.05 moles

(Moles of the acid are equal to the moles of water produced.

Moles of solution = 0.05 moles)

<u>Step 4: </u>Calculate the enthalpy of the reaction

ΔH = heat change /Number of moles

    = -1.985 kJ/ 0.05 moles

   =- 39700 J/mol = -39.7 kJ/ mol

The enthalpy of the reaction is -39.7 kJ/ mol

The enthalpy of the reaction is negative, this means the reaction is exothermic ( which means the final temperature is higher than the initial temperature.)

You might be interested in
Organic protein catalysts are called:<br> carbohydrates<br> amino acids<br> enzymes<br> lipids
Fittoniya [83]

Answer:

Enzymes.

Explanation:

That would be enzymes.  They increase the rate of chemical reactions in cells.

7 0
3 years ago
Read 2 more answers
How much heat must your body transfer to 500.0g of water to heat it from 25.0°C to body temperature, 37.0°C?
shtirl [24]

Answer : The heat your body transfer must be, 25.1 kJ

Explanation :

Formula used :

Q=m\times c\times \Delta T

or,

Q=m\times c\times (T_2-T_1)

where,

Q = heat = ?

m = mass of water = 500.0 g

c = specific heat of water = 4.18J/g^oC

T_1 = initial temperature  = 25.0^oC

T_2 = final temperature  = 37.0^oC

Now put all the given value in the above formula, we get:

Q=500.0g\times 4.18J/g^oC\times (37.0-25.0)K

Q=25080J=25.1kJ

Therefore, the heat your body transfer must be, 25.1 kJ

3 0
2 years ago
Can someone please answer this question please I really need to know
Zarrin [17]

Answer: aging?

Explanation: sorry, i’m not too sure, but that would be my best guess.

8 0
2 years ago
Which part of a light microscope focuses light onto the specimen through the lens?
finlep [7]
I think its the mirror because condenser helps in allowing the amount of light to pass.
5 0
3 years ago
How many orbitals are in the 5th energy level?
Alexandra [31]

Answer:7

Explanation:

8 0
2 years ago
Read 2 more answers
Other questions:
  • Lewis is making a model of the Earth-Moon system. He knows that the diameter of the Earth is about four times greater than the d
    7·2 answers
  • What contribution did Niels Bohr make to atomic theory?
    8·1 answer
  • 12 the products of the neutralization reaction between hydrochloric acid and magnesium hydroxide are
    10·1 answer
  • Chelsi has talked to her artist friends about how much money they earn each year from working in the arts. She gathers these val
    12·1 answer
  • 0.17 M KCHO2 Find the pH
    14·1 answer
  • Select the correct answer from each drop-down menu.
    8·1 answer
  • Identify the state of matter for A, B, and C.
    7·1 answer
  • Which conditions suggest that a bond will be ionic
    9·2 answers
  • Zn(s) + HCl(aq) → ZnCl2(aq) + H2(g) ↑
    14·1 answer
  • This is the balanced chemical equation for a reaction
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!