Atank contains 90 kg of salt and 2000 l of water. pure water enters a tank at the rate 6 l/min. the solution is mixed and drains from the tank at the rate 3 l/min.

(a) what is the amount of salt in the tank initially? (in kg)

(b) find the amount of salt in the tank after 3.5 hours. (in kg)

(c) find the concentration of salt in the solution in the tank as time approaches infinity. (assume your tank is large enough to hold all the solution.) ( in kg/l)

a) 90 kg

b) 68.4 kg

c) 0 kg/L

Explanation:

Mass balance:

w is the mass flow

m is the mass of salt

v is the volume flow

C is the concentration

a) Initially: t=0

b) t=210 min (3.5 hr)

c) If time trends to infinity the  division trends to 0 and, therefore, m trends to 0. So, the concentration at infinit time is 0 kg/L.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.