Question

How 2 came? pls explain ​

Answer 1

Here is your answer mate...

thé full réaction is à décomposition réaction....

hope this helps you.... mark as brainliest

Answer 2

When pb(no3)2 decompose it form lead monoxide ,and librates no2 gas( reddish brown) and O2 gas. After balancing you get follow equation  2Pb(No3)2 (s) ---> 2PbO( s)+ 4No2 ( g) + O2 (g). That's why in equation you get 2 Pb(N03)2.