Consider the following reaction: 2Fe2O3= 4Fe+3O2 Change of heat= +824.2KJ

The formation of 52.0 g of Fe results in

A) the absorption of 10700 kJ of heat.

B) the release of 192 kJ of heat.

C) the absorption of 192 kJ of heat.

D) the absorption of 767 kJ of heat.

E) the release of 767 kJ of heat.

F) the release of 10700 kJ of heat.

• C.

A positive change of heat means it’s endothermic, so it absorbs heat.

The change in heat given is PER MOLE:

824.2jk/mol

You have 4 moles of Fe, so:

824.2kJ/4 mol = 206.05 kJ/mol

You’re given 52.0 g Fe. Convert this to moles:

52.0g * 1mol/55.8g = .932 mol Fe

So now you know you have .932 mol Fe to start with. Since the change in heat of Fe is 206.05 kJ/mol, then:

4 mol * 206.05 kJ/mol = 192 kJ

• A middle made up of graphite, carbon and a diamond seed is strategically located in direction of what’s largely an extremely great rigidity cooker. “it relatively is like putting at the same time a huge heavy puzzle,” Gemesis “Senior Diamond advance Technician” Chris Owens tells DBIS. “each and each of those anvils weighs approximately 30 kilos.” Graphite and diamonds are the two produced from organic carbon atoms. below severe warmth and rigidity, carbon atoms connect themselves to the seed, forming a diamond crystal. McEwen says, “there is approximately 500 diverse variables in the approach, and if any a variety of variables is slightly off, we get a diverse consequence.” The device reaches a million,500 ranges, and the rigidity on the middle is 850,000 kilos according to sq. inch — it relatively is resembling one hundred 8,000-pound elephants status on a coin. as quickly as the device is closed, nature takes over. 4 days later an extremely overwhelmed middle is taken out, and an synthetic diamond is interior.

• C