Question

1. iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

30 grams
60 grams
120 grams
150 grams

Explanation:

Step1: Write the chemical reaction

The reaction is $Fe + S
ightarrow FeS$.

Step2: Use the law of conservation of mass

The mass of reactants equals the mass of products. Let the mass of sulfur be $x$ grams. The mass of iron is 60 grams and the mass of iron - sulfide is 90 grams. So, $60 + x=90$.

Step3: Solve for $x$

$x = 90 - 60=30$ grams.

Answer:

30 grams