The amount of urea in ppm [parts per million] present in an aqueous solution containing 55 % by mass of solvent is 5.5 X 10 to the power of 5 space p p m

8.18 X 10 to the power of 5 space p p m

1.22 X 10 to the power of 5 space p p m

4.5 X 10 to the power of 5 space p p m

a. they are both space stations

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2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.