3 Multiple Choice 5 points 4Al+3S_(2)arrow 2Al_(2)S_(3) If 20 moles of Al are used, how many moles of S_(2) would be needed? 19molS_(2) 10molS_(2) 3molS_(2) 15molS_(2)

Question

Answer 1

To determine how many moles of

are needed when 20 moles of Al are used, we need to use the stoichiometric relationship from the balanced chemical equation:

From the equation, we see that 4 moles of Al react with 3 moles of

.We can set up a proportion to find the number of moles of

needed for 20 moles of Al:

Now, solve for

:

So, 15 moles of

are needed for 20 moles of Al.The:15 \text{ mol } S_2 \]

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