A2.5-l tank initially is empty, and we want to fill it with 10 g of ammonia. the ammonia comes from a line with saturated vapor at 25◦c. to achieve the desired amount, we cool the tank while we fill it slowly, keeping the tank and its content at 30◦c. find the final pressure to reach before closing the valve and the heat transfer.

592.92 x 10³ Pa

Explanation:

Mole of ammonia required = 10 g / 17 =0 .588 moles

We shall have to find pressure of .588 moles of ammonia at 30 degree having volume of 2.5 x 10⁻³ m³. We can calculate it as follows .

From the relation

PV = nRT

P x 2.5 x 10⁻³ =  .588 x 8.32 x ( 273 + 30 )

P = 592.92 x 10³ Pa

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