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3 years ago

Determine how many atmospheres or pressure are equal to 65.78

1 answer:

8 0

The answer is 0.6492 atm. The given quantity 65.78 kPa is multiplied by a conversion factor in which the numerator and denominator are equal, hence, it is like multiplying by 1 which does not change the given value. To convert kPa to atm, we use the conversion factor 1 atm = 101.325 kPa. Therefore,
65.78 kPa (1 atm/101.325 kPa) = 0.6492 atm

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Find the mass of 2.16 × 1023 molecules H2S.<br> Answer in units of g.

worty [1.4K]

Answer:

Mass = 12.276 g

Explanation:

Given data:

Number of molecules of H₂S = 2.16 × 10²³

Mass in gram = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

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3 years ago

At a temperature of 273 K, a 400.-milliliter gas sample has a pressure of 760. millimeters of mercury. If the pressure is change

KatRina [158]

Answer:

188.03K

Explanation:

The following data were obtained from the question:

T1 (initial temperature) =273K

V1 (initial volume) = 400mL

P1 (initial pressure) = 760mmHg

P2 (final pressure) = 380mmHg

V2 (final volume) = 551mL

T2 (final temperature) =?

Applying the general gas equation P1V1/T1 = P2V2/T2, the final temperature of the gas can be obtained as follow:

P1V1/T1 = P2V2/T2

760 x 400/273 = 380 x 551/T2

Cross multiply to express in linear form as shown below:

760 x 400 x T2 = 273 x 380 x 551

Divide both side by 760 x 400

T2 = (273 x 380 x 551)/(760 x 400)

T2 = 188.03K.

Therefore, at a temperature of 188.03K, the gas sample will have a volume of 551mL

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4 years ago