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
slamgirl [31]
3 years ago
6

A student constructs a coffee cup calorimeter and places 50.0 mL of water into it. After a brief period of stabilization, the te

mperature of the water in the calorimeter is determined to be 22.6 °C. To this is added 50.0 mL of water that was originally at a temperature of 54.5 °C. A careful plot of the temperatures recorded after this established the temperature at T0 was 30.31 °C. What is the calorimeter constant in J/°C for this calorimeter?
Chemistry
1 answer:
Grace [21]3 years ago
5 0

Answer:

The calorimeter constant is  = 447 J/°C

Explanation:

The heat absorbed or released (Q) by water can be calculated with the following expression:

Q = c × m × ΔT

where,

c is the specific heat

m is the mass

ΔT is the change in temperature

The water that is initially in the calorimeter (w₁) absorbs heat while the water that is added (w₂) later releases heat. The calorimeter also absorbs heat.

The heat absorbed by the calorimeter (Q) can be calculated with the following expression:

Q = C × ΔT

where,

C is the calorimeter constant

The density of water is 1.00 g/mL so 50.0 mL = 50.0 g. The sum of the heat absorbed and the heat released is equal to zero (conservation of energy).

Qabs + Qrel = 0

Qabs = - Qrel

Qcal + Qw₁ = - Qw₂

Qcal = - (Qw₂ + Qw₁)

Ccal . ΔTcal = - (cw . mw₁ . ΔTw₁ + cw . mw₂ . ΔTw₂)

Ccal . (30.31°C - 22.6°C) = - [(4.184 J/g.°C) × 50.0 g × (30.31°C - 22.6°C) +  (4.184 J/g.°C) × 50.0 g × (30.31°C - 54.5°C)]

Ccal  = 447 J/°C

You might be interested in
_Fe2O3+ ___C --> __Fe + ___CO2
aev [14]

Answer:

2, 3, 4, 3

Explanation:

this is the answer

4 0
3 years ago
A particular power source creates electricity through the use of giant magnets that are rotated to create a flow of electrons. T
Sloan [31]
From the electric generator to electric outlets in homes
6 0
2 years ago
Read 2 more answers
A penny has a mass of 2.50g and the Moon has a mass of ×7.351022kg, How many moles of pennies have a mass equal to the mass of t
baherus [9]
Answer: 122 moles

Procedure:

1) Convert all the units to the same unit

2) mass of a penny = 2.50 g

3) mass of the Moon = 7.35 * 10^22 kg (I had to arrage your numbers because it was wrong).

=> 7.35 * 10^22 kg * 1000 g / kg = 7.35 * 10^ 25 g.

4) find how many times the mass of a penny is contained in the mass of the Moon.

You have to divide the mass of the Moon by the mass of a penny

7.35 * 10^ 25 g / 2.50 g = 2.94 * 10^25 pennies

That means that 2.94 * 10^ 25 pennies have the mass of the Moon, which you can check by mulitiplying the mass of one penny times the number ob pennies: 2.50 g * 2.94 * 10^25 = 7.35 * 10^25.

5) Convert the number of pennies into mole unit. That is using Avogadros's number: 6.022 * 10^ 23

7.35 * 10^ 25 penny * 1 mol / (6.022 * 10^ 23 penny) = 1.22* 10^ 2 mole = 122 mol.

Answer: 122 mol
8 0
3 years ago
To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave which you already know as 186000 m
nirvana33 [79]
To finish calculating the frequency of an electromagnetic wave, you need the wavelength
3 0
3 years ago
Read 2 more answers
The total mass of reactants and products is _______ during a chemical reaction
SIZIF [17.4K]

Answer: The total mass of reactants and products is the same during a chemical reaction.

Explanation:

the total mass of reactants is equal to the total mass of products.

5 0
3 years ago
Other questions:
  • Describe what happened on the Passover day at the time of jesus​
    7·1 answer
  • Write a scientific explanation using the CER format to answer the question:
    9·1 answer
  • Find the volume of 10g of gasoline if it has a density of 0.7g/mL
    9·1 answer
  • How does soil structure affect the characteristics of soil? a. It determines the acidity of soil. b. It determines the available
    12·1 answer
  • Which of the following is an example of a physical change? A) grinding coffee beans B) baking a cake C) converting water to hydr
    15·1 answer
  • What does core function mean
    13·1 answer
  • Can somebody help with parts c and d
    15·1 answer
  • Red blood cells are constantly being produced in your body. Another body system cooperates with the cardiovascular system in the
    12·1 answer
  • Is CH3COOCH3 an acid or base?
    11·2 answers
  • What are the strengths, weaknesses, and implications of risk/benefit analysis as a method for deciding whether a technology shou
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!