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nevsk [136]
2 years ago
15

Katie blows up a balloon and ties it so there is a fixed amount of air in the balloon. She wraps a piece of string around the wi

dest part of the balloon, and measures it to find the size of the balloon. She has access to:
-A freezer
-A warm cupboard
-A cold refrigerator
-A normal temperature classroom

Write a plan to collect results to answer the question:

How does the temperature affect the size of a blown up balloon?
​
Chemistry
1 answer:
stepladder [879]2 years ago
5 0

Answer:

According to Charles law

Explanation:

volume is directly proportional to absolute temperature

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How many moles of methanol must be added to 4.50 kg of water to lower its freezing point to -11.0 ∘c? for each mole of solute, t
DochEvi [55]

<u>Given:</u>

Mass of solvent water = 4.50 kg

Freezing point of the solution = -11 C

Freezing point depression constant = 1.86 C/m

<u>To determine:</u>

Moles of methanol to be added

<u>Explanation:</u>

The freezing point depression ΔTf is related to the molality m through the constant kf, as follows:

ΔTf = kf*m

where ΔTf = Freezing point of pure solvent (water) - Freezing pt of solution

ΔTf = 0 C - (-11.0 C) = 11.0 C

m = molality = moles of methanol/kg of water = moles of methanol/4.50 kg

11.0 = 1.86 * moles of methanol/4.50

moles of methanol = 26.613 moles

Ans: Thus around 26.6 moles of methanol should be added to 4.50 kg of water.



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