The heat required to completely melt the given substance, platinum, we just have to convert first the given mass in mole and multiply the answer to its molar heat of fusion..
Hf = mass x (1/molar mass) x molar heat of fusion
Hf = (85.5 g) x (1 mole/195.08 g) x 4.70 kcal/mol
Hf = 2.06 kcal
Oxygen and glucose and energy. <span />
The answer is D) wood decaying
Oxygen has 8 protons
8 + 7 = 15
This isoptope is O-15