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Anarel [89]
3 years ago
9

How could you engineer a device that produces beneficial friction and heat?

Chemistry
1 answer:
nlexa [21]3 years ago
3 0

Answer:

Hi

Explanation:

That's why rubbing your hands together makes them warmer. ... Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer. Heat from friction can be useful.

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ethyl chloride, c2h5cl, is used as a local anesthetic. it works by cooling tissue as it vaporizes; its heat of vaporization is 2
Inessa [10]

The amount of heat that could be removed by 20.0 g of ethyl chloride is 8.184 kJ.

<h3>How do we calculate required heat?</h3>

Required amount of heat which can be removed for the vaporization will be calculated as:

Q = (n)(ΔHv), where

  • n = moles of ethyl chloride
  • ΔHv = heat of vaporization = 26.4 kj/mol

Moles will be calculated as:

n = W/M, where

  • W = given mass of ethyl chloride = 20g
  • M = molar mass of ethyl chloride = 64.51 g/mol

n = 20 / 64.51 = 0.31 mol

On putting all these values in the above equation, we get

Q = (0.31)(26.4) = 8.184 kJ

Hence involved amount of heat is 8.184 kJ.

To know more about heat of vaporization, visit the below link:

brainly.com/question/13106213

#SPJ4

6 0
2 years ago
Calculate the mass of 1.23×1024 helium atoms.
just olya [345]

6.023*1023 He atoms=1 mole He

1.23×1024 helium atoms=1.23×1024/6.023*1023 =2.042 mole He

one mole He=4.0 gm

2.042 mole He=2.042*4.0=8.168 gm

answer in grams of Helium is 8.168 gm

7 0
4 years ago
If a bag of cement of mass 50 kg is acted upon by a force which produces acceleration 20m/ s calculate the force if you don't kn
dybincka [34]

Answer:

F=1000kg/m/s²

Explanation:

F=ma

F=50×20

F=1000

8 0
3 years ago
Which term is used to describe all the habitats around the world?
OlgaM077 [116]

Answer:

ecosystem diversity

Explanation:

hope this helped

5 0
2 years ago
100 g of 20% salt solution is mixed with 200g of 10% salt solution. Find out the concentration of the resulting solution.​
Hoochie [10]

Explanation:

The total mass is:

100 g + 200 g

= 300 g

The mass of salt is:

0.20 (100 g) + 0.10 (200 g)

= 20 g + 20 g

= 40 g

So the concentration is:

40 g / 300 g

≈ 13.33%

Round as needed.

7 0
3 years ago
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