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
