How many moles of H2 are needed to produce 18 moles of NH3 in the reaction below?
N2 + 3 H2 —> 2 NH 3

The answer to your question is 27 moles

Explanation:

Data

moles of H₂ = ?

moles of NH₃ = 18

balanced chemical reaction

                N₂  +  3H₂   ⇒   2NH₃

Process

To solve this problem use proportions and cross multiplication. Use the coefficients of the balanced reaction.

                3 moles of hydrogen 2 moles of ammonia

                x                                   18 moles of ammonia

                             x = (18 x 3) / 2

-Simplifying

                            x = 54/2

-Result

                             x = 27 moles                            

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

the answer would be c