N2(g)+3I2(s) --> 2NI3(s)
How many moles of NI3(s) can form when 127.0 g of I 2(s) react with excess nitrogen gas?

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1. Find the number of moles of I2 that you have.
2. Use your equation and 1. to get the number of moles of NI3 that you get.

Post what you get :)