- 4/5 6/7 X 8/9?

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The formula given is:
4 NH3 + 5 O2 - 4 NO + 6 H2O How many oxygen atoms are there in 15.00 grams of NO? give the answer in moles...
Thanks? A distinctive characteristic of mammals that is not observed in other vertebrates is -.? Use Cramer's rule to find the solution to the following system of linear equations.? How dangerous would it be to take 800 mg of ibuprofen every five hours instead of every six ? A trough is 15ft long&4 ft across.Its ends are isosceles triangles w/height 3ft. Water runs in at 2.5 ft^3/min.How fast water rises when 2ft?