Answer
No, 18.6 g of Mg contain 0.765 mole.
Explanation
Given that,
amount of Mg we have = 18.6
By looking at periodic table:
Molar mass of magnesium = 24.305 u (g/mole)
It means one mole of magnesium contain 24.305 grams of magnesium
So,
24.305g = 1 mole
1g = 0.04114379757 mole
18.6g = 0.765 mole
Hence, 18.6 g of Mg contains 0.765 mole
24.305 g of Mg contains a mole of Mg.
