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s344n2d4d5 [400]
3 years ago
12

Vapor pressure can be described as: A) the temperature at which bubbles of vapor appear in a liquid. B) the pressure exerted on

the Earth by the particles in the air. C) the temperature at which the vapor pressure of a liquid equals atmospheric pressure. D) the pressure exerted by a gas above the surface of its liquid. E) the pressure within the lungs during inhalation.
Chemistry
1 answer:
Vanyuwa [196]3 years ago
4 0

Answer: Option (D) is the correct answer.

Explanation:

Vapor pressure is defined as the pressure exerted by the vapors which are present on the surface of a liquid.

For example, vapor pressure of water at room temperature is 0.0313 atm.

On the other hand, the temperature at which the vapor pressure of a liquid equals atmospheric pressure is known as boiling point.

For example, boiling point of water at room temperature is 100^{o}C.

Thus, we can conclude that vapor pressure can be described as the pressure exerted by a gas above the surface of its liquid.

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For the reaction 2Na + 2H20 - 2NaOH + H2 how many grams of sodium hydroxide are
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Answer:

Explanation:

Moles of sodium

=

130

⋅

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22.99

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o

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⋅

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o

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Now you have the stoichiometric equation:

2

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a

(

s

)

+

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H

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O

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l

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→

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(

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+

H

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(

g

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↑

⏐

If there are

5.65

⋅

m

o

l

of metal, clearly

5.65

⋅

m

o

l

2

dihydrogen gas are evolved......, i.e.

2.83

⋅

m

o

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H

2

. Typically, in a question like this, you would also be asked to calculate the volume the gas occupies under standard conditions, and the

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How many moles are there in 44.71 g of chlorine (cl)? use significant figures?
krok68 [10]

Mass of chlorine  = 44.71 g (given)

Molar mass of chlorine  =35.45 g/mol

Now, number of moles is defined as the ratio of given mass in gram to the molar mass of the compound.

Number of moles  = \frac{given mass in g}{molar mass}

Number of moles of chlorine  =\frac{44.71 g}{35.45 g/mol}

= 1.26121297 moles

Now, according to significant figure rules, the least number of significant figure in the question identifies the number of significant figures in the solution.

Thus, in question, both digit have four significant figures, therefore, the answer must be in four significant figures.

Hence, number of moles of chlorine = 1.261 moles

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4 years ago
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