Posted by Sarene-to Dr. Bob222 on Tuesday, September 28, 2010 at 6:46pm.
135.32 is right but I'll need to find the question again to check the others. Also, I doubt that the number of significant figures correct for this one.
I'll get back to you here.
I would round #1 to 3 places; i.e., 135 g.
#2 looks ok.
#3. I have 9.91 x 10^19 BUT I think we used slightly different molar mass for H2. Just check the numbers on your calculator to make sure.
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