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3 years ago

8

a substance may change from one form to another with change in temperature. these are _______ changes

1 answer:

RoseWind [281]3 years ago

6 0

Answer:

Physical changes

As we know,

Physical changes are those changes which can be reversed and is not permanent. It does not change the chemical nature of the substance....A great example of physical change is given in the question itself, When a substance is melted it can be frozen or cooled back to it's original form, When an object is frozen it can be melted back to its Liquid form, and when an object is in gaseous form like water vapour it can be cooled, and brought back to liquid form....

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Read 2 more answers

The vapor pressure of liquid acetone, CH3COCH3, is 100 mm Hg at 281 K. A 6.06E-2 g sample of liquid CH3COCH3 is placed in a clos

Lynna [10]

Explanation:

According to ideal gas equation, product of pressure and volume equals the product of number of moles, gas constant and temperature.

Mathematically, PV = nRT

where P = pressure, V = volume

n = no. of moles, R = gas constant = 0.0821 atm L/mol

T = temperature

Since, it is known that number of moles equal mass divided by molar mass.

Hence, number of moles of given sample of acetone are as follows.

No. of moles = $\frac{mass}{\text{molar mass of acetone}}$

= $\frac{6.06 \times 10^{-2}}{58 g/mol}$

= $0.104 \times 10^{-2}$ mole

Therefore, putting the values in ideal gas equation as follows.

PV = nRT

$P \times 0.36 L = 0.104 \times 10^{-2} \times 0.082 atm L/mol \times 281 K$

= 0.359 atm

In 1 atm equal to 760 mm Hg. So, convert 0.359 atm into mm Hg as follows.

$0.359 atm \times \frac{760 mm Hg}{1 atm}$

= 272.84 mm Hg

Hence, pressure of the ideal gas will be 100 mm Hg + 272.84 mm Hg = 372.84 mm Hg

Thus, we can conclude that the ideal gas pressure in the container if all of the liquid acetone evaporated is 372.84 mm Hg.

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