The equation for the chemical reaction shown is not balanced. What number should replace the question mark to balance this equation?

2KBr + ?Pb(NO3)2 → 2KNO3+ PbBr2

A.
A 2 is required.

B.
A 6 is required.

C.
A 3 is required.

D.
The equation is balanced as is.

Question

The equation for the chemical reaction shown is not balanced. What number should replace the question mark to balance this equation?
 
2KBr + ?Pb(NO3)2 → 2KNO3+ PbBr2
 
 A.
A 2 is required.
 
 B.
A 6 is required.
 
 C.
A 3 is required.
 
 D.
The equation is balanced as is.

jhonyy9 · Answer

- this is balanced how is 

2K =2K
2Br = Br2
Pb = Pb
2N = 2N
2*3O = 2*3O

- so the left side equal right side - what mean that is balanced right sure

jhonyy9 · Answer

the ? mean 1