Chemical Engineering Answers

Which of the following have the same bond order?
A. N2 and N2^-
B. N2 and F2^+
C. F2^+ and O2^-
D. N2^- and O2^-

Which of the following is isoelectronic and isostructural?
A. SO3 and CO3^2-
B. CO3^2- and ClO3^-
C. NO3^- and SO3
D. NO3^- and CO3^2-

If 36 000 kg of full cream milk containing 4% fat is to be seperated in a 6 hour period into skim milk with 0.45% fat, what are the flow rates of the two output streams from a continuous centrifuge which accomplishes this seperation? (Start by drawing a flow diagram of the process).

A gas consists of 70% propane (C3H8) and 30% butane (C4H10) by volume. Calculate:
4.1. The stoichiometric amount of air required to burn 100 kmol/hr of feed if air is assumed to be 21% oxygen.
4.2. The percentage excess air present if a dry analysis of the combustion products shows 9% CO2 assuming complete combustion of propane and butane (hint - calculate the nitrogen that is left over from the reached oxygen first and assume the remainder of the exit stream is air).
Reactions:
C3H8 + O2 = CO2 + H2O
C4H10 + O2 = CO2 + H2O

A 15.00 mL sample of solution has 5.8 × 10^-5 g of calcium ion. Calculate the concentration in each of the following units:
3.1 % (m/v)
3.2 ppt
3.3 ppm

It is required to prepare 1250kg of a solution composed of 12 wt. % ethanol and 88 wt. % water. Two solutions are available, the first contains 5 wt. % ethanol, and the second contains 25 wt. % ethanol. How much of each solution are mixed to prepare the desired solution? Check your answer

Plot a graph of Wavelength against scale readings.
Wavelength - scale readings
396.4 - 11.1
402.6 - 10.1
412.0 - 9.5
414.4 - 9.3
438.8 - 7.9
447.1 - 7.5
471.3 - 6.5
492.2 - 5.8
501.6 - 5.6
504.8 - 5.5
587.5 - 3.7
667.8 - 2.5
706.5 - 2.1.

What is simple harmonic motion. Write down the expression for the velocity and acceleration of such motion at the different positions along its path

Air (ideal and perfect gas) with mass of 8.000kg is heated at constant pressure of 9.000mbar (gage) from -20.810C to 179.148C. Determine the heat required in MJ, and the change of the system volume (ΔV= V2-V1).

Evaluate the volume occupied by 7.000 kg of air at a gage ressure of 623 kPa and a temperature of 686 C. Calculate air density undet the same conditions.