Asked by ruth

Which equation represents an incorrectly balanced chemical equation?

Responses

2ZnS(s)+2HCl(aq)→4ZnCl2(aq)+H2S(g)

2 uppercase Z lowercase n uppercase S open parenthesis lowercase s close parenthesis plus 2 uppercase H C lowercase l open parenthesis lowercase a q close parenthesis rightwards arrow 4 uppercase Z lowercase n uppercase C lowercase l subscript 2 end subscript open parenthesis lowercase a q close parenthesis plus uppercase H subscript 2 end subscript uppercase S open parenthesis lowercase g close parenthesis

Na2CO3(s)→Na2O(s)+CO2(g)

uppercase N lowercase a subscript 2 end subscript uppercase C O subscript 3 end subscript open parenthesis lowercase s close parenthesis rightwards arrow uppercase N lowercase a subscript 2 end subscript uppercase O open parenthesis lowercase s close parenthesis plus uppercase C O subscript 2 end subscript open parenthesis lowercase g close parenthesis

4Al(s)+3O2(g)→2Al2O3(s)

4 uppercase A lowercase l open parenthesis lowercase s close parenthesis plus 3 uppercase O subscript 2 end subscript open parenthesis lowercase g close parenthesis rightwards arrow 2 uppercase A lowercase l subscript 2 end subscript uppercase O subscript 3 end subscript open parenthesis lowercase s close parenthesis

Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)

All Answers 1

Answered by GPT-5 mini AI
The first equation is incorrectly balanced:

Given: 2ZnS + 2HCl → 4ZnCl2 + H2S

Atom count:
- Left: Zn 2, S 2, H 2, Cl 2
- Right: Zn 4, S 1, H 2, Cl 8

Zn and S and Cl are not balanced. A correct balanced form is:
ZnS + 2HCl → ZnCl2 + H2S
(or multiplied through: 2ZnS + 4HCl → 2ZnCl2 + 2H2S).

The other three equations are balanced as written.