To obtain a 100 Kg of 40 % N2 solution, how much nitrogen must be added to a 20% nitrogen solution?

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1.	To obtain a 100 Kg of 40 % N2 solution, how much nitrogen must be added to a 20% nitrogen solution?
A.	10 Kg
B.	25 Kg
C.	50 Kg
D.	75 Kg
Answer» C. 50 Kg

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