Amixture of ethyl acetate vapour and air has a relative saturation of 50% at 303 k and a total pressure of 100 kpa. if the vapour pressure of ethyl acetate at 303 k is 16 kpa, the molal saturation is (a) 0.080 (b) 0.087 (c) 0.264 (d) 0.029

Answer : The correct option is, (b) 0.087

Explanation :

The formula used for relative saturation is:

where,

= partial pressure of ethyl acetate

= vapor pressure of ethyl acetate

Given:

Relative saturation = 50 % = 0.5

Vapor pressure of ethyl acetate = 16 kPa

Now put all the given values in the above formula, we get:

Now we have to calculate the molar saturation.

The formula used for molar saturation is:

and,

P(vapor free) = Total pressure - Vapor pressure

P(vapor) = = 8 kPa

So,

P(vapor free) = 100 kPa - 8 kPa = 92 kPa

The molar saturation will be:

Therefore, the molar saturation is 0.087

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

the answer is na (sodium)