What is the mass of oxygen gas produced if 100.0 g of water…

What is the mass of oxygen gas produced if 100.0 g of water vapor decomposes?  Report answer to the proper number of significant figures. Show work using Dimensional Analysis (as best you can) for FULL CREDIT. 2 H2O (g)  —>  2 H2 (g)  +  O2 (g)   You may want to use a table to show your Dimensional Analysis work.