Question

calculate the molar mass of the following - a. ca(OH)2 b. Al2 (SO4)3​

Answer 1

Answer:

a. Ca(OH)2 Molar mass of calcium + 2 × Molar mass of oxygen + 2×molar mass of hydrogen ⇒ 40 + 2 × 16 + 2 × 1 ⇒ 40 + 32 + 2 ⇒ 74g/mol Thus, the molar mass of Ca(OH)2 is 74g.

b. Al2(SO4)3 2 × Molar mass of aluminium + 3 × Molar mass of sulphur + 12×molar mass of oxygen ⇒ 2 × 27 + 3 × 32 + 12 × 16 ⇒ 54 + 96 + 192 ⇒ 342g/mol Thus, the molar mass of Al2(SO4)is 342g

Answer 2

Answer:

a. ) Ca(OH)2 :

Molar mass of calcium + 2 × Molar mass of oxygen + 2×molar mass of hydrogen

⇒ 40 + 2 × 16 + 2 × 1

⇒ 40 + 32 + 2

⇒ 74 g / mol

Thus, the molar mass of Ca(OH)2 is 74 g / mol.

b. ) Al2(SO4)3 :

2 × Molar mass of aluminium + 3 × Molar mass of sulphur + 12×molar mass of oxygen

⇒ 2 × 27 + 3 × 32 + 12 × 16

⇒ 54 + 96 + 192

⇒ 342 g /cmol

Thus , the molar mass of Al2(SO4)3 is 342 g / mol .

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