Which are the reactants in this chemical reaction?
zn + 2hcl zncl2 + h2
a. zn + h2
b. zn + 2hcl
c. zncl2 + h2
d. 2hcl + zncl2

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