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Hey, Ive been given a question and I was a bit unsure on my workings or answer could somebody clarify what I've done please. Hydrogen peroxide is a very useful and environmentally friendly bleaching agent. It can be produced in a controlled (slow) way by the reaction. CaO2(s) + 2 H2O(l) Ca(OH)2(s) + H2O2(aq) How many grams of H2O2 would be produced if 20.0 g of CaO2 were reacted with 15.0 g of H2O? (Molar masses in g/mol are: CaO2 = 72.0; H2O = 18.0; Ca(OH)2 = 74.0 and H2O2 = 34.0) Step 1: n(CaO2) = (1mol CaO2)x(20.0g CaO2)/(72.08g CaO2)= 0.2774694 mol CaO2 n(H2O) = (1mol H2O)x(15.0g H2O)/(18.016g H2O)= 0.8325932 mol H2O Step 2: 0.2774694 mol CaO2 x 2 mol H2O/ 1 Mol CaO2 = 0.5549388 Mol H2O H2O is limiting Step 3: 0.8325932 mol H2O x 1 mol H2O2/ 2 mol CaO2 = 0.416296 mol H2O2 Step 4: 0.416296 mol H2O2 x 34.016g H2O2/1 mol H2O2 = 14.2g H2O2 is produced

Thank you hypervalent_iodine you have been very helpful, Ill read up and work on those points right away, my unit doesn't start for another month so it should be plenty of time to get the basics in my head before I start.

Hello I'm new to science, I have always been amazed with space and the idea of how big it truly is, thats why I decided to look into further study more then just a hobby, and I was lucky enough to find a course that I can do which is a postgraduate in master of science (astronomy) however to start that I need to begin the undergraduate Bachelor of science(applied science). I really do enjoy science yet I haven't done it since I've left school (8 years). and my job, at the present is working with difficult young people in custody, a job which does not relate to astronomy at all. My first unit is introduction to chemistry which I have never done, its a basic unit but I'm wonder if any one on this forum can get me started. What are the fundamental things to know? What level of math does it require on a undergraduate level? and other handy tips that will allow me to one day, have my master of astronomy. Thanks for your help.