0:00
All right.
00:01
So our enthalpy change for the reaction is given as 117 .3 kilojoules.
00:08
For part a, we want to know is heat absorbed or released? well, delta h is positive, which is consistent with heat being absorbed.
00:16
It's an endothermic reaction.
00:20
For part b, what's delta h for the reverse reaction? so when you reverse a reaction, you just flip the sign of delta h.
00:26
So it would be negative 117 .3 kilojoles.
00:31
For part c, what is delta h if we are reacting 3 .70 moles of co2? well, the balanced equation has one mole of co2.
00:41
So it's 117 .3 kilojoules, negative, because we're talking about the reaction of co2 when it's a reaction.
00:51
So the flipped equation, so negative per mole of co2.
00:56
So if we just multiply by 3 .0 moles of co2, then we'll get the heat change associated.
01:03
With the 3 .7 moles...