How many moles of H2 are needed to produce 34.8 moles of NH3

Example plz

If a || b and e || f, what is the value of y ?

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?

Which three statements represent the benefits of performing experiments using computer simulations?