what are the numbers that must be placed in the black to balance the chemical equation

1,2,1,2
2,1,1,2
2,1,2,1
1,2,2,1

what are the numbers that must be placed in the black to balance the chemical equation 1212 2112 2121 1221 class=

Respuesta :

Answer:

OPTION A

Explanation:

IN BALANCE IT SHOULD BE

2H2 an 2h2o

fdbbg1
Option A is the correct answer