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svetoff [14.1K]
3 years ago
5

What is the pressure of 20.5 mols of helium gas at 444 K and 999 L

Chemistry
1 answer:
Charra [1.4K]3 years ago
5 0

Answer:

IDK

Explanation:

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What is the boiling point of a solution of 76 g of water dissolved in 500 mL of acetic acid, CH3COOH?
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Answer:

127.3° C, (This is not a choice)

Explanation:

This is about the colligative property of boiling point.

ΔT = Kb . m . i

Where:

ΔT = T° boling of solution - T° boiling of pure solvent

Kb = Boiling constant

m = molal (mol/kg)

i = Van't Hoff factor (number of particles dissolved in solution)

Water is not a ionic compound, but we assume that i = 2

H₂O →  H⁺  +  OH⁻

T° boling of solution - 118.1°C =  0.52°C . m . 2

Mass of solvent =  Solvent volume / Solvent density

Mass of solvent = 500 mL / 1.049g/mL → 476.6 g

Mol of water are mass / molar mass

76 g / 18g/m = 4.22 moles

These moles are in 476.6 g

Mol / kg = molal → 4.22 m / 0.4766 kg = 8.85 m

T° boling of solution =  0.52°C . 8.85 m . 2 + 118.1°C =  127.3°C

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Find the volume of 56.0 grams of O2
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Answer:

39.2 L at STP

Explanation:

Convert the grams to moles first by dividing 56.0 by the molar mass of O2 (32.0) then convert to volume by multiplying by 22.4.

= 39.2 L

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The atoms of a certain material can absorb red and blue light frequencies. What happens to yellow light that shines on it?
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