Potatoes are made up of 99% water and 1% "potato matter. Mr. T. Bought 100 pounds of potatoes and left them outside in the sun for a while. When he returned, he discovered that the potatoes had dehydrated and were now only made up of 98% water. How much did the potatoes now weigh?

99pounds

Explanation:

Dehydration refers to the loss of water from an organic substance such as potatoes.

Before dehydration:

Initial composition of potatoes = 99% water + 1% "potato matter = 100%

Initial weight of potatoes = 100 pounds

After dehydration:

Final composition = 98% water + 1% "potato matter ( 1% "potato matter is solid particle, so it cannot be lost by dehydration) = 99%

Final weight of potatoes = ?

Let the final weight of potatoes be Z

Therefore, 100% composition weighed 100 pounds

while 99% composition weighed Z pounds

Since ratio of composition in % to weight is 1:1

Z = 99 pounds

Thus, the dehydrated potatoes now weigh 99 pounds.

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  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-