Answer to Question #154212 in Chemistry for Sage Topaz

Question

 Limiting Substance: The substance that is totally reacted upon in a given chemical reaction:

         Mg(OH)₂ + 2HCl  → MgCl₂ + 2H₂O

A chemist has 203 g of Mg(OH)₂ and 164 g HCl. The chemist wants to make these substances react to form MgCl₂ which can be used for fireproofing wood or as disinfectant. How much MgCl₂ can be produced and how much water is formed?

Answer 1

i) - $x = \frac{4.5}{2} = 2.25$ mol Mgcl2

W_mgcl2 = $2.25\times 95$

= 213.75 g

ii)- $x = \frac{4.5\times 2}{2} = 4.5$ mol

W_H2O = $4.5\times18 = 81g$