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denis23 [38]
3 years ago
13

Consider the following two substances and their vapor pressures at 298 K.

Chemistry
2 answers:
Vadim26 [7]3 years ago
8 0

Answer:

Based on the information, the comparison of characteristics of two substances is as follow:

Substance A:

  • Has a higher boiling point
  • Has a higher heat of vaporization

Substance B:

  • Has weaker intermolecular forces
  • Is a gas at 300 mmHg

Explanation:

  • The substance A has vapor pressure 275 mmHg so it has low vapor as compared to substance B so it has higher boiling point and has higher heat of vaporization.
  • The substance B has vapor pressure of 459 mmHg so it has weaker intermolecular forces as compared to substance A and also it is a gas at 300 mmHg.    

Lady bird [3.3K]3 years ago
4 0

Answer:

Comparing the two substances, A and B

a) B has weaker in intermolecular forces.

b) A has a higher boiling point.

c) B is a gas at 300mmHg.

d) A has a higher heat of vaporization

The reason for this is because vapour pressure is the measure of the pressure exerted by a gas above a liquid in a closed container. Strong intermolecular forces produce a lower rate of evaporation and a lower vapor pressure. Weak intermolecular forces produce a higher rate of evaporation and a higher vapor pressure.

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26.3 moles of O₂ are needed to react completely with 35.0 mol of FeCl₃

Explanation:

To determine the number of moles of O₂ that are needed to react completely with 35.0 mol of FeCl₃, it is possible to use the reaction stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction),  and rule of three as follows: if 4 moles of FeCl₃ react with 3 moles of O₂, 35 moles of FeCl₃ with how many moles of O₂ will it react?

molesofO_{2} =\frac{35 moles of FeCl_{3}*3 moles of O_{2}  }{4 moles of FeCl_{3}}

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<u><em>26.3 moles of O₂ are needed to react completely with 35.0 mol of FeCl₃</em></u>

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