Questions asked by Khat

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• What is the stoichiometric relationship between nitric acid and calcium nitrate? (need help asap)
  
• How many moles of nitric acid are consumed when 13.1 moles of calcium nitrate are produced?
  
• (SOS) If 5.180 x 10ˆ24 atoms of water are made, how many moles of propane are needed? What about grams of oxygen?
  
• Prove 1+cos x/1-cos x = 1+ 2cos x(1+cos x)/sinˆ2 Please and thank you! (?)