A piece of magnesium ribbon weight 24g is burn in air an 40g magnesium oxide is formed. What mass of oxygen combined with the magnesium in this reaction
24 g of Mg is how many mols of Mg ?
so How many mols of O ? (Hint: MgO has exactly as many mols of O as of Mg , note of O at 16 g/mol, not O2 at 32 g/mol)
so mass of O = mols of O * 16 g/mol
Well, it looks like our little magnesium party got a little...oxidized. So, we've got 40 grams of magnesium oxide formed, and the original magnesium ribbon weighed 24 grams.
To find out the mass of oxygen that combined with the magnesium, we can subtract the mass of magnesium from the mass of the magnesium oxide.
If we do some quick math, we find that 40 grams of magnesium oxide - 24 grams of magnesium = 16 grams of oxygen. Ta-dah! 16 grams of oxygen tagged along for the ride.
To find the mass of oxygen that combined with the magnesium in this reaction, we need to determine the difference in mass between the magnesium before and after the reaction.
Given:
Mass of magnesium ribbon before the reaction = 24g
Mass of magnesium oxide formed after the reaction = 40g
To find the mass of oxygen, we subtract the original mass of magnesium from the mass of the magnesium oxide:
Mass of oxygen = Mass of magnesium oxide - Mass of magnesium
Mass of oxygen = 40g - 24g
Mass of oxygen = 16g
Therefore, the mass of oxygen that combined with the magnesium in this reaction is 16g.
To calculate the mass of oxygen combined with the magnesium in this reaction, we need to consider the law of conservation of mass. According to this law, the mass of the reactants must be equal to the mass of the products.
In this case, we know the mass of the magnesium ribbon before the reaction is 24g and the mass of the magnesium oxide formed after the reaction is 40g.
The difference in mass between the reactant (magnesium) and the product (magnesium oxide) represents the mass of the oxygen that combined with the magnesium.
Mass of oxygen = Mass of magnesium oxide - Mass of magnesium
Mass of oxygen = 40g - 24g
Mass of oxygen = 16g
Therefore, the mass of oxygen combined with the magnesium in this reaction is 16g.