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Jet001 [13]
3 years ago
15

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

tial temperature of the water?
Chemistry
1 answer:
shutvik [7]3 years ago
5 0

Answer: 38.5^0C

Explanation:

To calculate the initial temperature of the water:

q=m\times c\times (T_{final}-T_{initial})

where,

q = heat absorbed = 5.73\times 10^5J

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

m = mass of water = 2230 g

T_{final} = final temperature of water = 100^0C

T_{initial} = initial temperature of metal = ?

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

5.73\times 10^5J=2230g\times 4.18J/g^oC\times (100-T_i)^0C

(100-T_i)=61.5

T_i=100-61.5)=38.5^0C

Thus, the initial temperature of the water is 38.5^0C

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<h3>Answer:</h3>

Chlorine gas (Cl₂)

<h3>Explanation:</h3>
  • According to the Graham's law of diffusion, the diffusion rate of a gas is inversely proportional to the square root of its density or molar mass.
  • Therefore, a lighter gas will diffuse faster at a given temperature compared to a heavy gas.
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In this case we are given gases, CI₂

, H₂,He and Ne.

  • We are required to identify the gas that will diffuse at the slowest rate.
  • In other words we are required to determine the heaviest gas.

Looking at the molar mass of the gases given;

Cl₂- 70.91 g/mol

H₂- 2.02 g/mol

He - 4.00 g/mol

Ne- 20.18 g/mol

Therefore, chlorine gas is the heaviest and thus will diffuse at the slowest rate among the choices given.

8 0
3 years ago
You are asked to perform a reaction by dissolving hypochlorous acid in water. Based on your understanding of acids, you understa
AnnZ [28]

According to the principle of chemical equilibrium, when additional hypochlorous acid is added, the hypochlorite ion concentration will increase.

<h3>What is chemical equilibrium?</h3>

Chemical equilibrium refers to the equilibrium which exists between chemical species in a reaction such that the rate of forward and backward reactions are the same.

Since the reaction is in equilibrium, when additional hypochlorous acid is added, the hypochlorite ion concentration will increase ad equilibriumwill shift to the right of the reaction.

Learn more about chemical equilibrium at: brainly.com/question/15854786

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3 0
2 years ago
Increasing temperature can:
umka21 [38]

The answer would be A. You cannot decrease mass because of increasing temp so it can't be C and adding neutrons or protons would be changing the atom and therefore the element, and that is not possible through just an increase of temperature, so it can't be B or D. Hope this was helpful! ;)

3 0
3 years ago
Read 2 more answers
How is sodium peroxide formed?​
nordsb [41]

Answer:

Sodium peroxide can be prepared on a large scale by the reaction of metallicsodium with oxygen at 130–200 °C, a process that generates sodium oxide, which in a separate stage absorbs oxygen: 4 Na + O2 → 2 Na2O. The ozone oxidizes the sodium to form sodium peroxide.

8 0
3 years ago
Calculate the amount of heat needed to convert 50.0 g of liquid water at to steam at 100ºC.
Kipish [7]

Answer:

We need 113000 J of heat (option 2 is correct)

Explanation:

Step 1: Data given

Mass of liquid water = 50.0 grams

ΔHVap = 2260 J/g

Temperature = 100 °C

ΔHVap = The amount of heat released to change phase of a liquid water to steam = 2260 J/g

Step 2: Calculate the heat needed

Q =m* ΔHVap

⇒with Q = the amount of heat needed = TO BE DETERMINED

⇒with m = the mass of water = 50.0 grams

⇒with ΔHVap = 2260 J/g

Q = 50.0 grams * 2260 J

Q = 113000 J

We need 113000 J of heat (option 2 is correct)

6 0
3 years ago
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