Calculate the amount of energy required to vaporize 287 grams of water at its boiling point. Hint: The heat of vaporization for water is 40.68 kJ/mol.

Blank allows you to do calculations for situations in which only the amount of gas is constant a)boyle's law b)combined gas law c)ideal gas law d)dalton's law

What produces wave a)sound b) heats c)transfer of energy d)vibrations

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ