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Alenkinab [10]
3 years ago
8

25 POINTS + BRAINLIEST!!! How do you calculate the number of molecules in a substance? For example, Al2O3. (The numbers are subs

cripts) Please explain simply, to a point where a grade 9 can understand.
Chemistry
1 answer:
Scrat [10]3 years ago
3 0
You add them together

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What is the mass of 0. 513 mol Al2O3? Give your answer to the correct number of significant figures. (Molar mass of Al2O3 = 102.
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The mass of a 0.513 mol of Al2O3 is 52.33g.

HOW TO CALCULATE MASS:

The mass of a substance can be calculated by multiplying the molar mass of the substance by its number of moles. That is;

mass of Al2O3 = no. of moles of Al2O3 × molar mass of Al2O3

According to this question, there are 0.513 moles of Al2O3.

Mass of Al2O3 = 0.513 × 102

Mass of Al2O3 = 52.33g

Therefore, the mass of a 0.513 mol of Al2O3 is 52.33g.

Learn more about mass calculations at: brainly.com/question/8101390?referrer=searchResults

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