Answer: See attached explanations
You’re answer would be B love!
The reactants of the reaction will be solid gold (III) sulfide and hydrogen gas, while the products will be pure solid gold and hydrogen sulfide gas.
<h3>Chemical reactions</h3>
Reactants react together during reactions to arrive at products.
In this case, solid gold (III) sulfide and hydrogen gas react according to the following equation:

Reactants = solid gold (III) sulfide, hydrogen gas
Products: pure solid gold, hydrogen sulfide gas
More on chemical reactions can be found here: brainly.com/question/1689737
Five hundred twenty million, three hundred and forty thousand. hope it helps!
Molecular weight calculation:
24.305 + (15.9994 + 1.00794)*2
Molar mass of Mg(OH)2 = 58.31968 g/mol