Given the discovery of chlorine-resistant pathogens, ozone is commonly used as an alternate disinfectant for drinking water. Ozone decay in water nearly follows first-order kinetics, such that its concentration decreases by half every 12 minutes (t1/2 = 12 min). A water supplier wants to inject ozone into a 4.0-ft diameter pipe that is 3,000 ft long receiving a steady water flow of 15,000 gal/min. What concentration of ozone (in mg/L) should be injected at the head of the pipe so that there will be an ozone concentration of 1.0 mg/L at the pipe’s exit? The pipe may be modeled as an ideal plug flow reactor.

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5