About two centuries ago Ben Franklin showed that 1 teaspoon of oil would cover about 0.5 acre of still water. If you know that 1.0x10^4 m^2 = 2.47 acres, and that there is approximately 5 cm^3 in a teaspoon, what is the thickness of the layer of oil?

Explanation:

2.47 acre = 10⁴ m²

.5 acre = .2024 x 10⁴ m²

= 2024 m²

volume of oil = 5 x 10⁻⁶ m³

If thickness be t

volume of oily layer  = area x thickness

= 2024 x t = 5 x 10⁻⁶

t = 5 x 10⁻⁶ / 2024

= 2.47 x 10⁻⁹ m

= 2.47 nm .

- lead + phosphoric acid = hydrogen + lead(ii) phosphate