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
alina1380 [7]
2 years ago
15

When 1.045 g of CaO is added to 50.0 mL of water at 25.0 °C in a calorimeter, the temperature of the water increases to 32.3 °C.

Assuming that the specific heat of the solution is 4.18 J/(g⋅°C) and that the calorimeter itself absorbs a negligible amount of heat, calculate ΔH in kilojoules/mol Ca(OH)2 for the reaction
Chemistry
1 answer:
Rus_ich [418]2 years ago
8 0

Answer:

1.71 kJ/mol

Explanation:

The expression for the calculation of the enthalpy change of a process is shown below as:-

\Delta H=m\times C\times \Delta T

Where,  

\Delta H  is the enthalpy change

m is the mass

C is the specific heat capacity

\Delta T  is the temperature change

Thus, given that:-

Mass of CaO = 1.045 g

Specific heat = 4.18 J/g°C

\Delta T=32.3-25.0\ ^0C=7.3\ ^0C

So,  

\Delta H=1.045\times 4.18\times 7.3\ J=31.88713\ J

Also, 1 J = 0.001 kJ

So,  

\Delta H=0.03189\ kJ

Also, Molar mass of CaO = 56.0774 g/mol

Moles=\frac{Mass}{Molar\ mass}=\frac{1.045}{56.0774}\ mol=0.01863\ mol

Thus, Enthalpy change in kJ/mol is:-

\Delta H=\frac{0.03189}{0.01863}\ kJ/mol=1.71\ kJ/mol

You might be interested in
Which unit can be used to express the rate of a reaction?
vichka [17]
<span>The rate of reaction may be expressed as a unit of quantity divided by a unit of time. The only expression that has a quantity divided by time is the first one mL / s (i.e. milliliter per second), so the answer is the first option, mL/s.</span><span />
4 0
3 years ago
Read 2 more answers
What does changing densities cause to occur
Dafna1 [17]

Answer:

Explanation:

Please Elaborate

8 0
3 years ago
⇔what process occurs in some cells
Serhud [2]
It could be a couple different thing, explain more.<span />
3 0
2 years ago
When a candle burns what form of energy does the chemical energy in the candle change
soldier1979 [14.2K]
The energy transforms from chemical energy to heat and light energy. Because when the candle burns a chemical reaction occurs, and produces heat and light.
8 0
3 years ago
<img src="https://tex.z-dn.net/?f=%5Ctext%7BThis%20is%20for%20a%20school%20project.%20I%20just%20need%20help%20on%20these%20two%
BigorU [14]

Answer:

Water molecules in the solid state, such as in ice and snow, form weak bonds (called hydrogen bonds) to one another. These ordered arrangements result in the basic symmetrical, hexagonal shape of the snowflake.

Explanation:

5 0
2 years ago
Other questions:
  • The Arizona poppy has adapted to living in areas that receive less rain, but there are still periods of time that a drought occu
    14·1 answer
  • Why is the actual dihedral angle of gauche butane different from<br> 60degrees?
    11·1 answer
  • How many moles of ethane (C2H6) would be needed to react with 62.3 grams of oxygen gas?
    11·1 answer
  • Water (2230 g ) is heated until it just begins to boil. If the water absorbs 5.73×105 J of heat in the process, what was the ini
    15·1 answer
  • If 0.500 L of a 4.00-M solution of copper nitrate, Cu(NO3)2, is diluted to a volume of 1.50 L by the addition of water, what is
    11·1 answer
  • What is programming language? Describe it's types.<br>​
    11·1 answer
  • The molarity of a solution prepared by dissolving 4.11 g of NaI in enough water to prepare 312 mL of solution is
    7·1 answer
  • What is the result when earth layers experience extension stress? Question 2 options:
    10·1 answer
  • If 7.45g of N2 and 36.5mL of 0.150M O2 react together, how many grams of N2O gas will be produced?
    6·1 answer
  • HELP I NEED THIS ASAP<br>ON THE IMAGE​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!