In the following reaction: 4 Al + 3 O2 –> 2 Al2O3 How many moles of aluminum would be needed to completely react with 90 grams of O2?

molar ratio= 4:3

                   since al moles needed so we will leave al in moles and convert o into grams

             4: since 1 mole of oxygen is 16g so 3 moles is 48

4:48

put given data

x:90

90*4/48

7.5 moles          

Explanation:

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pla·gia·rism

/ˈplājəˌrizəm/

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noun

the practice of taking someone else's work or ideas and passing them off as one's own.

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