In order to compare amounts of two different substances, it is necessary to figure out the amount of moles of both substances. Moles can be obtained by dividing the mass of a substance by its formula mass. If you have 17 grams of a substance with a formula mass of 68.264 g/mol, how many moles do you have?
Report your answer to 3 decimal places. ​

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