Which equations are balanced?
a)Mg (s)+ 2HCl (aq)? $\mathrm { MgCl } _ { 2 }$ (aq)+ $\mathrm { H } _ { 2 }$ (g)
b)3Al (s)+ 3 $\mathrm { Br } _ { 2 }$ (l)? $\mathrm { Al } _ { 2 }$ $\mathrm { Br } _ { 3 }$ (s)
c)2HgO (s)? 2 Hg (l)+ $\mathrm { O } _ { 2 }$ (g)
A)Only equation "c" is balanced.
B)Equations "a" and "c" are balanced.
C)Equations "b" and "c" are balanced.
D)All of them are balanced.

Question

Which equations are balanced? 
a)Mg (s)+ 2HCl (aq)? $\mathrm { MgCl } _ { 2 }$ (aq)+ $\mathrm { H } _ { 2 }$ (g)
b)3Al (s)+ 3 $\mathrm { Br } _ { 2 }$ (l)? $\mathrm { Al } _ { 2 }$ $\mathrm { Br } _ { 3 }$ (s)
c)2HgO (s)? 2 Hg (l)+ $\mathrm { O } _ { 2 }$ (g)
A)Only equation "c" is balanced.
B)Equations "a" and "c" are balanced.
C)Equations "b" and "c" are balanced.
D)All of them are balanced.

Quizplus · Accepted Answer

Equation "a" is balanced with 1 Mg, 2 H, and 2 Cl on both sides. Equation "c" is balanced with 2 Hg and 2 O atoms on both sides. Equation "b" is not balanced because the product should be $AlBr_6$ for the stoichiometry to match.

Which Equations Are Balanced? A)Mg (S)+ 2HCl (Aq) MgCl2\mathrm { MgCl } _ { 2 }MgCl2​

Which Equations Are Balanced?
A)Mg (S)+ 2HCl (Aq) $\mathrm { MgCl } _ { 2 }$