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Leviafan [203]
3 years ago
6

A sample of an unknown liquid is vaporized in a flask having a volume of 298 mL at 100.0°C. The vapor has a mass = 0.687 g, and

exerts a pressure = 775 torr. Calculate the molecular weight of the unknown liquid.​
Chemistry
1 answer:
Dafna11 [192]3 years ago
7 0

Answer:

69.196

Explanation:

<em><u>using ideal gas </u></em><em><u>equation</u></em>

  • PV= nRT
  • n= mass/molar mass
  • PV=mass/molar mass x RT
  • R = 62.364LTorrmol-¹k-¹
  • make molar mass subject of formula
  • m.m=(massxRT)/PV
  • m.m = (0.687 x 62.364 x373)/(775 x 0.298)
  • m = 69.196
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Determine the mass of 5.20 moles of C6H12 (gram-formula mass = 84.2 grams/mole).

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