I missed a few days of school due to a sick child. I'm reviewing for an exam and the following questions are giving me trouble as I wasn't there when they were reviewed in class. If possible, I need the answer and step-by-step process so I can see what what to do and make sure I'm doing it right. Thanks.

Question

1.) If you put hydrogen peroxide on a cut, you’ll notice that it bubbles. The bubbles are diatomic oxygen which is effectively “sterilizing” the wound. If you had 10 g of H2O2, how many grams of oxygen would you form on the cut.

2.) Alka Seltzer is a solid mixture of sodium bicarbonate and citric acid that when placed in water undergoes this reaction…..fizzing.
3NaHCO3(s) + C6H8O7(s) = 3CO2(g) + 3H2O(l) + Na3C6H5O7(aq)
Who is the limiting reactant if you had 100g each of sodium bicarbonate and citric acid?

Answer 1

Bob Pursley answered your first post. It's below.

Answer 2

Dr. Bob, I am unable to see the answer you have provided? I'm not sure why, but I see "Bob Pursley answered your first post. It's below." The problem is, the is no post below.

Answer 3

You must scroll down and find the original post. Here is a link.
http://www.jiskha.com/display.cgi?id=1415924736

Answer 4

1. 2H2O2 ==> 2H2O + O2
mols H2O2 = grams/molar mass = 10/34 = 0.294/
Using the coefficients in the balanced equation, convert mols H2O2 to mols O2.
That's 0.294 mols H2O2 x (1 mol O2/2 mols H2O2) = 0.294 mols H2O2 x 1/2 = 0.147 mols O2.
Now convert mols O2 to grams. g O2 = mols O2 x molar mass O2. The correct answer
0.147 x 32 = 4.70 g O2.

2. This is the same type but asking slightly different question. Try it and see what you can do. Repost with specific questions about what you don't understand if you require more assistance.