May 23rd, 2018, 11:38 AM  #1 
Senior Member Joined: Jan 2017 From: US Posts: 112 Thanks: 6  Calculate Energy Required OR Released Calculate the amount of energy required or released in the formation reaction for five moles of liquid water H2O(l). This occurs at standard temperature and pressure. Express your answer in joules. The heat of formation of water is 285.8 kJ/mol. Is this an endothermic or exothermic reaction? Explain your reasoning and show all your work to receive full credit. Could anyone point me in the right direction with this? I am going back through my chemistry lessons but really have no idea where to begin with this. Any help will be greatly appreciated! Thanks. 
May 23rd, 2018, 03:03 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,287 Thanks: 1681 
It's exothermic, as the heat of formation is negative.

May 23rd, 2018, 05:43 PM  #3 
Senior Member Joined: Jan 2017 From: US Posts: 112 Thanks: 6 
So if it's exothermic, heat is released... which means that is what needs calculated, the amount of heat released. How could I begin to set this equation up?

May 23rd, 2018, 10:39 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 19,287 Thanks: 1681 
The heat released is 285.8 kJ/mol, so multiply that by 5 mol.


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