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.

abbiegalie · Answer

A balanced equation would have the same amount of each element on both sides, So on the right side there are six NO3 atoms and 1 Pr atom. On the left side there are six NO3 (multiply what is inside the parenthesis with what is outside.. 3*2 =  6) atoms and 1 pr atom. So it is balanced.