12/06/14

Chemistry, find standard heat of reaction of this reaction. Please help me understand how to do these problems
This question is about the reaction4HCl(g)+O2(g)-->2H20(g)+2Cl2(g)A) Using the values of ΔfH°, find the standard heat of the reaction of this reaction.B) Using average bond energies, estimate... more
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12/04/14

a tree 10.5 ft tall cast a shadow 11.5 ft. long. what is the height that cast a shadow 17.5 ft. long
like I really don't know what to do I really need a quick response
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