2 H2O -> 2 H2 + O2 How many moles of H O are needed to produce 55.7 moles of H2?

If enough H2O is reacted to produce 3.40 moles of H2,Then how many moles of O2 must have been made?

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2