Question

what is the mass of 1.50 moles of Ca(OH) 2?​

Answer 1

The mass of 1.5 moles of Ca(OH)₂ is 111g.

We have to find the mass of 1.5 moles of Ca(OH)₂.

First, we have to find out molecular mass of Ca(OH)₂.

• atomic mass of Ca = 40 g/mol
• atomic mass of O = 16 g/mol
• atomic mass of H = 1 g/mol

now molecular mass of Ca(OH)₂ = atomic mass of Ca + 2(atomic mass of O + atomic mass of H)

= 40 + 2(16 + 1)

= 40 + 34

= 74 g/mol

We know,

number of moles of a substance = mass of substance/molar mass of substance

⇒ 1.5 moles = mass of Ca(OH)₂/74

⇒ mass of Ca(OH)₂ = 1.5 × 74 = 111 g

Therefore the mass of 1.5 moles of Ca(OH)₂ is 111g.