Question

HELP

How many grams are in 2.500 mol of magnesium hydroxide?

58.33 g
0.04286 g
145.8 g
100.8 g
23.33 g

Answer 1

145.8g

Step-by-step explanation:

Given parameters:

Number of moles of magnesium hydroxide = 2.5mol

Unknown:

Mass of Mg(OH)₂ = ?

Solution:

To solve this problem we use the expression below;

Mass of Mg(OH)₂ = number of moles x molar mass

Molar mass of Mg(OH)₂ = 24.3 + 2(16 + 1) = 58.3g/mol

Mass of Mg(OH)₂ = 2.5 x 58.3 = 145.8g