You must first calculate the total weight of 1 mole of the substance. You do this by finding the molar weights on the periodic table of each of the elements in the compound:
So now we take the amount of each element that is given in the compound and divide it by the total mass of the compound:
Carbon: 96.08g
Carbon = 49.48%
Nitrogen: 56.028g
Nitrogen = 28.85%
Oxygen: 31.998g
Oxygen = 16.48%
Don't understand the text, but water always freezes at 0°C as long as its water.
Heat moves through conduction, convection and radiation.
A simply because of I'm a pretty good guesser, Hope this helps.