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  4. How many moles of Al2(SO4)3 would be in 50 g of the substance?

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Q. How many moles of $ A{{l}_{2}}{{(S{{O}_{4}})}_{3}} $ would be in 50 g of the substance?

JamiaJamia 2006

Solution:

Key Idea: $ Moles=\frac{mass}{molecular\text{ }weight} $ Given, mass of $ A{{l}_{2}}{{(S{{O}_{4}})}_{3}}=50\,g $ molecular mass of $ A{{l}_{2}}{{(S{{O}_{4}})}_{3}}=342\,g $ $ \therefore $ Moles of $ A{{l}_{2}}{{(S{{O}_{4}})}_{3}}=\frac{50}{342}=0.14\,mol $