Answer :
Final answer:
To find the number of moles of magnesium in 5.00 g of MgO, we need to calculate the molar mass of MgO and use it to convert grams to moles. The molar mass of MgO is 40.31 g/mol, so there are 0.124 moles of magnesium in 5.00 g of MgO.
Explanation:
To find the number of moles of magnesium in 5.00 g of MgO, we will first determine the molar mass of MgO. The molar mass of MgO is the sum of the atomic masses of magnesium (Mg) and oxygen (O). The atomic mass of Mg is 24.31 g/mol and the atomic mass of O is 16.00 g/mol. Therefore, the molar mass of MgO is (24.31 g/mol) + (16.00 g/mol) = 40.31 g/mol.
Now we can use the molar mass to convert grams of MgO to moles of MgO. The formula to calculate moles is moles = mass / molar mass. Substituting the values given, we have:
moles = 5.00 g / 40.31 g/mol = 0.124 moles
Therefore, there are 0.124 moles of magnesium in 5.00 g of MgO.
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