You multiply avogadro's number to what you were given.
8.30x10^23 * 6. 0221409x10^23
=1.357*10^25
That should be the right answer but I'm not sure. It has been awhile since I have done this.
Heating a substance will make the molecules move faster. It creates thermal energy
The hydrogens and oxygen of a water molecule are held together by covalent bond
combustion is when you burn something in presence e of oxygen and the products will be mainly the CO2 and H2O