Question

a chemical equation for the reaction between calcium hydroxide, and sulfuric acid, is shown. the masses of some of the reactants and products are given in grams.
ca(oh)₂ + h₂so₄ → caso₄ + 2h₂o
74 g ? 136 g 36 g
how many grams of sulfuric acid were used in the reaction?
possible points: 7.69
○ 62 g
○ 98 g
○ 36 g
○ 100 g

Explanation:

Step1: Apply law of conservation of mass

According to the law of conservation of mass, the total mass of reactants equals the total mass of products.

Step2: Set up mass - balance equation

Let the mass of sulfuric acid be $x$ grams. The mass of calcium hydroxide is 74 g, the mass of calcium sulfate is 136 g and the mass of water is 36 g. So, $74 + x=136 + 36$.

Step3: Solve for $x$

$x=(136 + 36)-74$.
$x = 98$ g.

Answer:

98 g