Question

a gas occupies a volume of 250 ml at 745 mm hg and 25 C what additional pressure is required to reduce the gas volume to 200 ml at the same temperature. .....please help me

Answer 1

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Answer 2

Answer:

186.25 mmhg

Explanation:

This is a question on gas laws

To solve it we must first make sure that the Celsius scale is changed into Kelvin's

To convert from Celsius to Kelvin's we add 273

Therefore

25°C + 273 = 298 K

The formula is

P1×V1/T1 = P2 V2/T2

P stands for pressure , V stands for volume and T for temperature

745 × 250/298 = x × 200/298

The new pressure is denoted by x since it is unknown

625 = 200/298x

We multiply both sides by the recipricol of 200/298 x

625 × 298 /200 = x

X = 931.25 mmHg

That is the new pressure but we have been asked the additional pressure needed

Additional pressure = final pressure - initial pressure

931.25 - 745 = 186.25 mmhg