A balloon is filled with gas at 29.8 degrees Celsius until its volume is 2,780 mL. The balloon is then placed into an industrial freezer for twenty-four hours before being remeasured. If the final temperature of the gas in the balloon is -38.4 degrees Celsius, what is the final volume of the balloon? Round your answer to the nearest 1 mL.

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