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Quiz: How to Determine Percent Composition from Mass Data

This quiz is based on the screencast: How to Determine Percent Composition from Mass Data

Students are allowed to use their screencast notes to help them answer these questions.

Why just O (Why not O₂)?

This is impossible, O always has to be O₂ no matter what

because the Oxygen is bonded to something else (in this case, Magnesium)

What is the mass of magnesium?

24.97 g

The mass of the total compound - The mass of Oxygen = The mass of Magnesium

What is a percent?

A part to whole ratio where the whole is 100

A part to part ratio where the whole is 100

A part to whole ratio where the whole is never the same and depends on specific cases

How can we figure out % by mass of an element?

By multiplying by the coefficient

it's the mass of that element divided by the mass of the compound multiplied by 100

What is the percent of oxygen?

60.3%

39.7%

100%

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