there are 3.78 liters of methane gas collected over water at 15.0 C and 691 mmHg. What is the new pressure of the dry gas after the temperature changes to 47.0 C and the volume increases to 5.94 liters

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