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denpristay [2]
2 years ago
5

Volume of a gas at STP, if its volume is 80.0 mL at 1.08 atm and –12.5oC.

Chemistry
2 answers:
vodomira [7]2 years ago
7 0

Answer:

90.5mL is the volume of the gas at STP

Explanation:

It is possible to find volume of a gas when conditions of temperature and pressure change using combined gas law:

\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}

Where P is pressure, V is volume and T is absolute temperature. 1 is initial conditions and 2 final conditions.

If initial conditions are 1.08atm, 80.0mL and absolute temperature is (-12.5°C + 273.15) = 260.65K.

And STP are 1atm of pressure and 273.15K of absolute temperature. Replacing:

\frac{1.08atm80.0mL}{260.65K} =\frac{1atmV_2}{273.15K}

V₂ = <em>90.5mL is the volume of the gas at STP</em>

Scilla [17]2 years ago
5 0

Answer:

0.09L

Explanation:

Step 1:

Data obtained from the question.

Volume (V) = 80 mL

Pressure (P) = 1.08 atm

Temperature (T) = –12.5°C

Step 2:

Conversion to appropriate unit.

We must convert the unit of the volume and temperature to the right unit of measurement this is illustrated below:

For volume:

1000mL = 1 L

Therefore, 80 mL = 80/1000 = 0.08L

For temperature:

Temperature (Kelvin) = temperature (celsius) + 273

Temperature (Kelvin) = –12.5°C + 273

Temperature (Kelvin) = 260.5K

Step 3:

Determination of the number of mole of the gas.

The number of mole of the gas can be obtained as follow:

Volume (V) = 0.08L

Pressure (P) = 1.08 atm

Temperature (T) = 260.5K

Gas constant (R) = 0.082atm.L/Kmol

Number of mole (n) =?

PV = nRT

1.08 x 0.08 = n x 0.082 x 260.5

Divide both side by 0.082 x 260.5

n = (1.08 x 0.08) / (0.082 x 260.5)

n = 4.04x10^-3 mole

Step 4:

Determination of the volume occupied by the gas at stp.

This is illustrated below:

1 mole of a gas occupy 22.4L at stp

Therefore, 4.04x10^-3 mole will occupy = 0.09L at stp.

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Explanation:

E)cost of pollution is reduction in benefit of the firms.

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MB=90-3E

TB=90E- 1.5E^2

TB at E=18

TB=90*18 -1.5*18*18=1620-486=1134

TB at E=15

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And the amount he is paying is equal to the amount that is cost of other firm of reducing additional pollution units.

So the cost the firm is lower as he is paying lower amount than if he reduce pollution by itself.

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