Magnesium + oxygen 2Mg(s) + O2 (9)
magnesium oxide
2MgO (s)
1. Using the equation above, determine how many grams of oxygen are required
to burn 10.0 grams of magnesium.
2.29
O 3.39
6.69
Ο Ο
13.29

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