Question

how many ions are there in 80g of magnesium oxide?

Answer 1

Answer:

1.0mol

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Answer 2

Given:

Mass of magnesium oxide = 80 g

To find:

Number of ions in 80 g of magnesium oxide.

Solution:

We know that the molecular weight of magnesium oxide is 40 g, thus the number of moles present in 80 g of magnesium oxide will be:

No. of moles = 80/40 = 2

We know that the chemical formula of magnesium oxide is MgO, which means it contains Mg and O in equal proportions. Thus, in 2 mole of magnesium oxide,

No. of Mg²⁺ ions will be = 2 × 6.022 × 10²³ = 12.044 × 10²³

No. of O²⁻ ions will be = 2 × 6.022 × 10²³ = 12.044 × 10²³

Thus the number of each magnesium and oxygen ions will be 12.044 × 10²³.