Form of matter is least stable at temperature?

gaseous state of matter is least stable at high temperature.

answer : Solid is the most unstable form of matter at a high temperature

Reason : Solid is the rigid form of matter which has a definite shape and Volume. At low temperature, the solid state of matter has the lowest chemical potential and so the solid is the most stable phase

Hope this helps you

Solid matter is the least stable at high temperature solid liquid gas.

Reason.

Solid is the rigid form of matter which has a definite shape and Volume. At low temperature, the solid state of matter has the lowest chemical potential and so the solid is the most stable phase.

answer:

explanation: 1 mole of p2o5 (phosphorus pentoxide)  with excess  water gives 2 moles of phosphoric acid h3 po4.     2 moles of  phosphoric acid in excess of ammonium hydroxide, produces 2 moles of  (nh2) hpo4 salt (s) and hydrogen gas.

      molecular weight of p2o5  :   2*31+ 16*5 = 142

      molecular weight of (nh2) hpo4 :   14+3+31+64 =  112

      100gms of nh2 hpo4 = 100/112 = 25/28  moles   come from

      =>   25/56 moles of p2  o5

      =>   25/56 * 142 = 63.39 gms.

balanced equations:

    p2 o5 + 3  h2 o   =>   2 h3 po4

    2 h3 po4 (aq)  + 2  nh4 oh (aq) ==> 2(nh2) hpo4  (s)+3h2 (g)+  2h2o

we know that in the final product, phosphorus is present only in (nh2)hpo4.   it contains one atom of p.   there are two atoms of p in p2o5.   hence,   we know easily that   1 mole of pentoxide gives   (nh2)hpo4 (s) precipitate.

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