Question

1. using the law of conservation of mass, determine the missing mass values.

hcl + naoh → nacl + h₂o
mass 20g + ____ → 30g + 15g

Explanation:

Step1: Recall Law of Conservation of Mass

The law states that the total mass of reactants equals the total mass of products. Let the missing mass of NaOH be \( x \) grams. Reactants: HCl (20g) + NaOH (\( x \)g). Products: NaCl (30g) + \( \text{H}_2\text{O} \) (15g). So, \( 20 + x = 30 + 15 \).

Step2: Solve for \( x \)

Calculate the sum of products: \( 30 + 15 = 45 \)g. Then, \( x = 45 - 20 = 25 \)g.

Answer:

The missing mass (of NaOH) is 25g.