Question

How many moles of atoms are present in 5 moles of Mg(OH)₂?

A) 5 moles
B) 10 moles
C) 15 moles
D) 20 moles

Answer 1

To determine the number of moles of atoms present in 5 moles of Mg(OH)₂, we need to consider the number of moles of magnesium and hydroxide ions. In one mole of Mg(OH)₂, there is 1 mole of Mg and 2 moles of OH.

Step-by-step explanation:

To determine the number of moles of atoms present in 5 moles of Mg(OH)₂, we need to consider the number of moles of magnesium and the number of moles of hydroxide ions in one mole of Mg(OH)₂. Mg(OH)₂ consists of one magnesium atom and two hydroxide ions. So, we have:

1 mole of Mg(OH)₂ = 1 mole of Mg + 2 moles of OH

Since 1 mole of Mg is equivalent to 6.022 × 10²³ atoms, 5 moles of Mg would be equivalent to 5 × 6.022 × 10²³ = 3.011 × 10²⁴ atoms.