Which symbol represent an isotope of carbon

¹⁴C or ¹³C

isotopes ;

atom of the same element having same atomic number but different in nucleon(mass) number

idk

explanation:

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.