How many grams of water could have its temperature raised from 25 ºC (room temperature) to 100 ºC (the boiling point of water) by the amount of energy released in the formation of 4.0 mol of H2 from hydrogen atoms? The bond energy of H2 is 435 kJ/mol. The specific heat of water is 4.184 J/g °C. Express your answer in scientific notation.

Answer 1

I thought I worked this a couple of days ago.
4H ==> 2H2
So 435 kJ/mol x 2 mol = 870 kJ.

870,000J = mass H2O x specific heat H2O x (Tfinal-Tinitial)
Plug and chug. Solve for mass H2O