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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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tony9506 tony9506
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11 years ago
Here's the question:

Magnesium hydroxide is 54.87% oxygen by mass. How many grams of oxygen are in 175 g of the compound? How many moles of oxygen is this?

My book tells me that the answer is 96.0 g O; 6.00 mol O

But how did it come up with this?

Help would be greatly appreciated!
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#1
11 years ago
0.5487 x 175 = 96g. That is just taking a simple percentage of 175g.

Number of moles = mass / molar mass

n = 96 / 16 = 6 moles.
Answer accepted by topic starter
ilikepie1234ilikepie1234
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#2
11 years ago
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#3
3 years ago
Thank you
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