123 005w of heat is removed from water vapour (at 373k) condensing on the outer surfaces (at 363k) of an array of cylinders of length 0.6m and diameter 0.05m. how many cylinders are needed if the heat transfer coefficient is 3000w/m2k? hints: round off to the nearest integer and use newton's law of cooling.

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.

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".