Question detail
In a reaction, 20 g of magnesium oxide (MgO) is produced from 12 g of magnesium (Mg) and 8 g of oxygen (O2). Calculate the number of moles of magnesium oxide produced. Use the relative formula mass of MgO = 40.3 g/mol.
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At a glance
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
In a reaction, 20 g of magnesium oxide (MgO) is produced from 12 g of magnesium (Mg) and 8 g of oxygen (O2). Calculate the number of moles of magnesium oxide produced. Use the relative formula mass of MgO = 40.3 g/mol.
Answer
0.496 mol
Explanation
This question assesses the ability to calculate moles from mass using the relative formula mass. It requires understanding of the conversion process from grams to moles, reinforcing the concept of moles in chemical reactions.
Common mistake
Common Mistake in Balancing Equations
Students often confuse the masses of reactants and products with their mole ratios when balancing equations.
To fix this, students should first convert the given masses into moles using the relative formula mass before applying the mole ratios from the balanced equation.
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