(Solved): Hydraulic engineers use a unit called an acre.foot to describe a volume of water. This unit descri ...

Hydraulic engineers use a unit called an acre.foot to describe a volume of water. This unit describes, i.e., the volume of water that will cover 1 acre of land to a depth of one foot. If a severe thunderstorm unleashes 2 " of rain in 37 minutes over a town with an area of 21 km $$2.$$. a) What volume of water, in acre-feet, fell on the town? b) What was the rate of rainfall in units of $$\frac{\text{ acre.feet }}{\text{ hour }}$$ ? c) If one cubic meter of water has a mass of $$10^3\mathrm{kg}$$, what mass of water fell on the town? (include units with your answer) Thinking about more water... One molecule of water $$\left({\mathrm{H}}_2\mathrm{O}\right)$$ contains 2 atoms of hydrogen, one of oxygen. The mass of the $$\mathrm{H}$$ atom is $$1\mathrm{u}$$, and the mass of $$\mathrm{O}$$ is $$16\mathrm{u}$$. d) What is the mass, in $$\mathrm{kg}$$, of one water molecule? $$\mathrm{kg}$$ e) How many molecules of water are in the oceans of the world if they have a total mass of $$1.4\mathrm{e}21\mathrm{kg}$$ ?