What mass of phosphoric acid will be produced from the reaction of 10.00g of P4O10 with 12g water?

Answer 1

write the equation

P4O10 + 6H2O>> 4H3PO4

figure the mole of P4O10 you have in 10 g

figure the moles of water you have in 12 g

You need six moles of water for each mole of P4O10.

so which is the limiting reactant (least), moles of P4O10, or six times moles of water?

the limiting reactant is whichever of those is the smallest.

Then, moles acid= 4 times moles of limiting reactant, and convert that to grams of acid.