How much nitrogen must be added to a 20% nitrogen solution to obtain 100 Kg of 40% nitrogen solution?

Here are some steps for solving material balance problems: Draw a diagram: Sketch a simple diagram of the process. Write chemical equations: If applicable, write the chemical equations involved. Select a basis: Choose a basis for calculation. Make a material balance: Generate material balance equations by making the overall material balance and individual material balances of components involved. Then, solve them simultaneously. Label the process flow chart: Draw and label the process flow chart (block diagram). When labeling, write the values of known streams and assign symbols to... Show more

Here are some steps for solving material balance problems:
Draw a diagram: Sketch a simple diagram of the process.
Write chemical equations: If applicable, write the chemical equations involved.
Select a basis: Choose a basis for calculation.
Make a material balance: Generate material balance equations by making the overall material balance and individual material balances of components involved. Then, solve them simultaneously.
Label the process flow chart: Draw and label the process flow chart (block diagram). When labeling, write the values of known streams and assign symbols to unknown stream variables.
Use a table: Keep track of information using a table.
Use matrix algebra: Matrix algebra, also known as linear algebra, is well suited to solving material balance problems. 
Material balance problems can be solved by listing and solving a series of equations, or by use of a table where information is kept track of. 
 

Related Test: Chemical Engineering Practice Test: Material Balances

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