What if you started with 100 grams of wood and only have 95 grams of ashes produced, is mass still conserved? if so where is the missing 5 grams?

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?