Determine the mole ratio between oxygen and water for the following equation: 2 H2 + O2 - 2 H2O
A. 1:2
B. 1:1
C. 2:2
D. 2:1

Which of the following are correct values for the ideal gas laws constant r

All motion is caused by force? true or false

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