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How many moles of N2 are needed to react with 0.400 mol of lithium?

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How many moles of N2 are needed to react with 0.400 mol of lithium?

My teacher created this website full of chemistry, i try to understand stuff, its just hard to..

Update:

thanks guys(:

6Li + N2 ---> 2Li3N

6 moles of Li(lithium) reacts with 1 mole of N2

therefore 0.400 mol of Li reacts with 0.400/6 mol of N2

First, you need to work out or find the chemical formula. It is:

6Li + N2 = 2(Li3N)

So 6 moles of Li are needed to react with 1 mole of N2.

0.4 * 6 = 2.4 moles of Li are needed