Question 18 Which of the following best explains why top predators can have up to 60 times as much of persistent organic pollutant (POP) as their prey and up to 600 times as much of the
pollutant as producers?
POPs accumulate in the body fat of living organisms. POPs increase in concentration as they move up the food chain.

PV = nRT   (where P = pressure; V = volume; n = number of moles; R = gas constant; T = Temperature)
Moles of He = mass of He ÷ molar mass of He                    =  10 g ÷ 4 g/mol                    =  2.5 mol

Now, based on the formula above     P = (nRT) ÷ V
    P = (2.5 mol × (0.082 L · atm/mol · K) × 233 K) ÷  73 L        ≈  0.65 atm