Question

You are given the balanced equation:

Zn(NO3)2 (aq) + Na2S (aq) ----> ZnS (s) + X

What is correct formula for the product represented by X?

A. Na2(NO3)2 (s)
B. Na2NO3 (s)
C. NaNO3 (aq)
D. 2 NaNO3 (aq)

Answer 1

Answer is D, and it is double replacement reaction

Answer 2

D. 2 NaNO₃

Step-by-step explanation:

A double displacement reaction is a type of reaction where two reactants exchange ions to form two new compounds. Double displacement reactions typically result in the formation of a product that is a precipitate.

Double displacement reactions take the form:

AB + CD → AD + CB

For the reaction:

Zn(NO₃)₂(aq) + Na₂S(aq) → ZnS(s) + X

If Zn bond with S, NO₃ must be react with Na to produce NaNO₃ that is a soluble salt (Is in aqueous state (aq)). As there are 2 Na and 2 NO₃ the right answer is:

D. 2 NaNO₃

I hope it helps!