Balance the following equation and find molar ratios from the equation,

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write the molar ratios
a. n2 to h2
b. nh3 to n2
c. if you have two moles of n2 and enough of h2 how many moles of nh3 will be produced?

To balance it, it would be N2 + 3H2 > 2NH3. 

for c) it would be 2N2 + 6H2 > 4NH3

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts