Given the balanced equation: 2 h2(g) + o2(g) → 2 h2o(l) how many grams of h2o are formed if 9.00 mol h2(g) reacts completely with an excess of o2(g)? the molar mass of h2o is 18.0 g/mol.

             162 g of H₂O

Solution:

The Balance Chemical Equation is as follow,

                                     2 H₂  +  O₂    →    2 H₂O

According to equation when,

                         2 mol of H₂ is reacted  =  36 g (2 mol) H₂O is produced

So,

     9 mol H₂ on reaction will produce  =  X g of H₂O

Solving for X,

                    X =  (9 mol × 36 g) ÷ 2 mol

                    X =  162 g of H₂O

false

because it does not have the potential to be entirely used up

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.