question #1 (3.1.9 ) :-
in the making a material balance, classify the following processes as (1) batch, (2) semi-batch, (3) continuous, (4) open or flow, (5) closed, (6) unsteady-state, (7) steady-state . more than one classification may apply.
a. a tower used to store water for a city distribution system
b. a can of soda
c. heating up cold coffee
d. a flush tank on a toilet
e. an electric clothes dryer
f. a water fall
g. boiling water in an open pot
question #2 (3.1.12) :-
100 kg of sugar are disolved in 500 kg of water in a shallow open cylindrical vessel. after standing for 10 days , 300 kg of sugar solution are removed. would you expect the remaining sugar solution to have a mass of 300 kg ?
question #3 ( please see attachment ) !!!!!!!!!!!!
question #4 (3.2.9) :-
three gaseous mixtures, A,B & C , with the compositions listed in the table are blended into a single mixture
Gas A B C
CH4 25 25 60
C2H6 35 30 25
C3H8 40 45 15
total 100 100 100
A new analyst reports that the composition of the mixture is 25% CH4 , 25% C2H6 , and 50% C3H8 . without making any detailed caculations , explain how you know the analysis is incorrect ?
question #5 (3.2.14 b ) :-
for the following problem :
1- draw a figure
2- put the data in the problem on the figure
3-pick a basis
4. determine the number of unknowns and independent equation
5-write the material balances needed to solve the problem
6- write down any other pertinent equations and specifications
7-solve the problem if possible
(b) a dryer takes in wet timber ( 20.1% water ) and reduces the water content to ( 8.6% ) . you want to determine the kg of water removed per kg of timber that enters the process .
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