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

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

2. how is heavy water different from normal water

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world