Once Billy and Susie have the unobtanium at the melting point, how much heat must be absorbed to melt all the unobtanium? (heat of fusion: ΔHfus = 50.3 kJ/mol; molar mass 322.03 g/mol) Unobtanium=
q= 13,240 J
m= 78.9 g
Cp= 1.87 J/g*C
ΔT= 109*C-18.0*C

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.