Q.
ANS. - total Available solution of benzalkonium is 150 ml.(Q1)
Concentration of solution is 17%(C1) should be diluted in 5 gallon (Q2)
Note 1 gallon is 4000 ml, so 5 gallon = 5×4000
=20000 ml or 20 liter
Formula is Q1×C1=Q2×C2
150×17=20000×X
X=150×17÷20000
X= 2550÷20000
X= 0.127% is the right answer.
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