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Lunna [17]
3 years ago
8

A group of students is setting up a test to see whether earthworms, like those shown in the photo, prefer rough or smooth surfac

es
Chemistry
1 answer:
kotykmax [81]3 years ago
8 0

Answer:

they like smooth

Explanation:

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Write a reflection about your learning in this unit. Your reflection should be at least 3 sentences. Use the following sentence
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2 years ago
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3 years ago
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A solution is prepare using 45.2 g of an unknown (nonelectrolyte) dissolved in 476.4 g of water. The freezing point depression
Ray Of Light [21]

Answer:

94.4g/mol is molar mass of the unknown

Explanation:

Based on the freezing point depression equation:

ΔT = Kf*m*i

<em>Where ΔT is the depression in freezing point (1.87°C)</em>

<em>Kf is freezing point depression constant of water (1.86°Ckg/mol)</em>

<em>And i is Van't Hoff factor (1 for nonelectrolyte solutes)</em>

<em />

Replacing:

1.87°C = 1.86°CKg/mol*m*i

1.005mol/kg solvent = m

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1.005mol/kg solvent * 0.4764kg = 0.479moles

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45.2g / 0.479mol =

<h3>94.4g/mol is molar mass of the unknown</h3>
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2 years ago
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