Question

nabr + caf₂ → naf + cabr₂
what coefficients are needed to balance the chemical equation?
a 1,1,1,1
b 1,2,1,2
c 1,2,2,1
d 2,1,2,1

Explanation:

Step1: Count atoms on each side

On the left - hand side: 1 Na, 1 Br, 1 Ca, 2 F. On the right - hand side: 1 Na, 1 F, 1 Ca, 2 Br.

Step2: Balance Na and Br

To balance Na and Br, we need 2 moles of NaBr. So the equation becomes $2NaBr+CaF_2
ightarrow NaF + CaBr_2$. Now on the left - hand side: 2 Na, 2 Br, 1 Ca, 2 F. On the right - hand side: 1 Na, 1 F, 1 Ca, 2 Br.

Step3: Balance F and Na

To balance F and Na, we need 2 moles of NaF. The balanced equation is $2NaBr + CaF_2
ightarrow2NaF+CaBr_2$.

Answer:

D. 2,1,2,1