Question

4 moles of ca OH 2 weight​

Answer 1

74.093 g/mol

Calcium hydroxide/Molar mass

Answer 2

Given:

The number of moles of Ca(OH)₂ = 4

To Find:

The weight of the given sample of Ca(OH)₂

Solution:

The mass of 1 mole of any substance is equal to the molar mass of the substance.

The molar mass of Ca(OH)₂ = 1 X Molar mass of Ca + 2 X (Molar mass of O + Molar mass of H)

We know that,

The molar mass of Ca =40g

The molar mass of  O = 16g

The molar mass of H = 1g

Substituting,

The molar mass of Ca(OH)₂ = 1 X 40 + 2 x (16+1)

= 40 + 34

= 74g

So, 1 mole of calcium hydroxide weighs 74g

⇒ 4 moles of calcium hydroxide weighs 74g X 4 = 296g.

Hence, the weight of 4 moles of Ca(OH)₂ is 296g