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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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<h3>Answer:</h3>

2.809 L of H₂SO₄

<h3>Explanation:</h3>

Concept tested: Moles and Molarity

In this case we are give;

Mass of solid sodium hydroxide as 13.20 g

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<h3>First: We need to write the balanced equation for the reaction.</h3>
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<h3>Second: We calculate the umber of moles of NaOH used </h3>
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  • Therefore;

Moles of NaOH = 13.20 g ÷ 40.0 g/mol

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<h3>Third: Determine the number of moles of the acid, H₂SO₄</h3>
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  • Therefore, the mole ratio of NaOH: H₂SO₄ is 2 : 1.
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                                    = 0.33 moles × 2

                                   = 0.66 moles of H₂SO₄

<h3>Fourth: Determine the Volume of the acid, H₂SO₄ used</h3>
  • When given the molarity of an acid and the number of moles we can calculate the volume of the acid.
  • That is; Volume = Number of moles ÷ Molarity

In this case;

Volume of the acid = 0.66 moles ÷ 0.235 M

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