Question 23

Question

Balance the following the chemical equation:
_Na2O+_CaBr2--->_NaBr+_CaO

a
1:1:1:2
b
1:1:2:1
c
1:2:1:1
d
2:1:1:1

Answer 1

To balance the chemical equation ${\text{Na}}_2\text{O}+{\text{CaBr}}_2\to \text{NaBr}+\text{CaO}$, we need to ensure that the number of atoms of each element is the same on both sides.

1. Identify the elements and their counts:

   • Reactants: ${\text{Na}}_2\text{O}$ (2 Na, 1 O) and ${\text{CaBr}}_2$ (1 Ca, 2 Br)
   • Products: $\text{NaBr}$ (1 Na, 1 Br) and $\text{CaO}$ (1 Ca, 1 O)

2. Balancing the equation:

   • Start with Na: We have 2 Na on the left (from ${\text{Na}}_2\text{O}$), so we need 2 Na on the right:
     • Place a coefficient of 2 in front of $\text{NaBr}$: $${\text{Na}}_2\text{O}+{\text{CaBr}}_2\to 2\text{NaBr}+\text{CaO}$$
   • Now, check the Br: We have 2 Br on the left (from ${\text{CaBr}}_2$), and 2 on the right (from $2\text{NaBr}$).
   • For Ca: There is 1 Ca on both sides (from ${\text{CaBr}}_2$ and $\text{CaO}$).
   • O: We have 1 O on both sides (from ${\text{Na}}_2\text{O}$ and $\text{CaO}$).

At this point, everything is balanced with the coefficients $1:1:2:1$.

Therefore, the balanced equation is: $$1{\text{Na}}_2\text{O}+1{\text{CaBr}}_2\to 2\text{NaBr}+1\text{CaO}$$

Thus, the correct answer is: a. 1:1:2:1