Question

What is the percent by mass of oxygen in Ca(OH)2 ?

Answer 1

Answer:

The answer to your question is Percent by mass = 43.2

Explanation:

Data

Ca(OH)₂

Percent by mass of Oxygen = ?

Process

1.- Calculate the molecular mass of Ca(OH)₂

    Ca(OH)₂ = (40 x 1) + (16 x 2) + (2 x 1)

                   = 40 + 32 + 2

                   = 74 g

2.- Calculate the mass of Oxygen = (16 x 2)

                                                        = 32 g

3.- Calculate the percent by mass

      Percent by mass = (mass of oxygen/mass of Ca(OH)₂) x 100

      Percent by mass = (32/74) x 100

      Percent by mass = 43.2