HW M.7 B

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HW M.7 B

Postby WilliamNguyen_4L » Tue Oct 09, 2018 11:32 pm

When it asks what mass of boron can be produced when 125 kg of boron oxide is heated with 125 kg magnesium why is boron oxide supposed to be used to calculate the mass of boron produced instead of magnesium? I thought magnesium would be the limiting reactant in this situation.

Julia Go 2L
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Re: HW M.7 B

Postby Julia Go 2L » Tue Oct 09, 2018 11:47 pm

Yes, you're right that magnesium is the limiting reactant. Are you referring to the solutions manual when you said that boron oxide is used to calculate the mass of boron produced?

If so, I think the solutions manual was illustrating that if you calculate how much boron can be produced by boron oxide and by magnesium, more product will be produced by boron oxide. This means that magnesium "runs out" faster in the equation and therefore, is the limiting reactant. The correct answer should use the number of moles of magnesium to calculate the mass off boron that can be produced.

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