Most popular questions and responses by asembi
  1. chemistry

    Pentaborane-9(B5H9) IS a colorless highly reactive liquid that will burst into flames when exposed to oxygen.The reaction is ' 2B5H9(l)+ 12O2--> 5B2O2(s)+9H2O(l) Calculate the kilojoules of heat released per gram of the compound reacted with oxygen.The

    asked on November 2, 2011
  2. chemistry

    a student mixes 88.6g of water at 74.3 degree Celsius with 57.9g of water at 24.8 degree Celsius in an insulated flask.What is the final temperature of the combined water.

    asked on November 2, 2011
  3. chemistry

    ethanol(C2H5OH)and gasoline(assumed to be octane,C8H18) are both used as automobile fuel.if gasoline is selling for $2.20/gal,what would the price of ethanol have to be in order to provide the same amount of heat per dollar?The density and ΔHf of octane

    asked on November 2, 2011
  4. physics

    the two upper front teeth of a person exert a total force of 30 N on a piece of steak.IF THE BITING EDGE OF EACH TOOTH MEASures 10mm x 1 mm,find the pressure on the steak

    asked on November 1, 2011