Electricalconsumption of a large city is usually 20,000
mw. if all
theh2o(g)
inthe atmosphere (assume it is 2% by volume) suddenly
condensed
toh2o(l),and
all the enthalpy of this process was captured and converted
toelectrical energy, how long would this energy power
thecity?

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.