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Leokris [45]
2 years ago
15

Pam's family is clearing some land, and there is a large boulder sitting on top of the ground. Even with the entire family pushi

ng on it, they cannot mov
it. Which type of friction exists between the boulder and the ground

Chemistry
1 answer:
SashulF [63]2 years ago
6 0

Answer:

d

Explanation:

I believe the answer to this question is d , I believe this as the question doesn't explain properly the surface under the boulder. it is questionable as the question is not clear though I believe this as there must be friction under the boulder stopping it from moving.

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What is the boiling point of a solution containing 203 g of ethylene glycol (C2H6O2) and 1035 g of water? (Kb for water is 0.52
Andru [333]

Answer:

101,37°C

Explanation:

Boiling point elevation is one of the colligative properties of matter. The formula is:

ΔT = kb×m <em>(1)</em>

Where:

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And m is molality of solution (mol of ethylene glycol / kg of solution). Moles of ethylene glycol (MW: 62,07g/mol):

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<em />

Molality is: 3,27moles of ethlyene glycol / (1,035kg + 0,203kg) = 2,64m

Replacing these values in (1):

X - 100°C = 0,52°C/m×2,64m

X - 100°C = 1,37°C

<em>X = 101,37°C</em>

<em></em>

I hope it helps!

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