Saturated steam at 300°c is used to heat a countercurrently flowing stream of methanol vapor from 65°c to 260°c in an adiabatic heat exchanger. the flow rate of the methanol is 6500 standard liters per minute, and the steam condenses and leaves the heat exchanger as liquid water at 90°c. calculate the required flow rate of the entering steam in m3/min. calculate the rate of heat transfer from the water to the methanol (kw). suppose the outlet temperature of the methanol is measured and found to be 240°c instead of the specified value of 260°c. list five possible realistic explanations for the 20°c difference.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

what is the question here. i think you messed up.

points

explanation: