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OpenStudy (anonymous):
Magnesium makes up 2.1% by mass of Earth's crust. How many grams of magnesium are present if a sample of Earth's crust has a mass of 1.20 g ?
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OpenStudy (rushwr):
\[1.2 * \frac{ 2.1 }{ 100 }\]
OpenStudy (rushwr):
0.0252g
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