How many grams are present in a 7.4 mole sample of H2O

When 1.50g of ba is added to 100g of water in a container open tothe atmosphere, the reaction shown below occurs and the temperatureof the resulting solution rises from 22 degrees to 33.10 degrees.if the specific heat of the solution is 4.18j/(g*c), calculatedelta h for the reaction, as written.ba (s)+2h2o(l) yields ba(oh)2(aq)+h2