How Accurate Are My Chemistry Calculations?

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To determine the moles of Li3N produced from 8.5 moles of Li, one must consider the stoichiometry of the reaction rather than simply adding moles of nitrogen. For calculating the number of atoms in 20.5 g of carbon, the correct approach involves using Avogadro's number and the molar mass of carbon to find the total number of atoms. The discussion also seeks clarification on the three basic types of compounds used as antacids, with suggestions to first write and balance the relevant chemical equations. Accurate calculations require understanding of chemical formulas and stoichiometry principles. Overall, the thread emphasizes the importance of proper methodology in chemistry calculations.
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Am I doing these right??

1)How many moles of Li3N will be produced if you begin with 8.5 moles of Li ?

**Do I just find the moles for 3N and add them to the 8.5 moles of Li?**


2)Calculate the number of atoms in 20.5 g Carbon

**I guess I would Multiply Carbon's atoms by 20.5?**


3)What are the three basic types of compounds that are used as antacids?

**I have no idea whatsoever! I've looked everywhere for the answer. Please help!**
 
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1) write first the equation
2) 12 gr C contains 6.027*10^23 atoms how mutch is this for 20.5 g?
3) antacids is this formic acid?
 
Like mit already said first write the equation, balance it, then determine the limiting reactant.
 
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