This table shows statistics about the us population in
2010
us population by age group (2010)
which group made up the smallest segment of the
population in 20102
percent of total
age group population number
under the age of 18
between 18 and 24
between 25 and 44
over the age of 65
under 18
24 0%
74,101,467
18 24
99%
30,672,080
26.0%
02.134,554
45 64
26.4%
01,400,445
13 0%
66 and
older
40,267,984

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.