Heat of Combustion?

[destain]

Firstly,
does Energy cange of reaction : CF x delta T equal to Energy required (4.184 x mass x delta T)
If you avoid thinking about the units and stuff, just the numerical value

SECONDLY,

How do you write an equation when it says
Hydrogen gas was burnt in the calorimeter, the question asks you to figure out the heat of combustion and then write a thermochemical equation, but to work out the HOC, you need the coefficient of Hydrogen which i need from the equation

[nisha]

1. I think that is correct. That is what I assumed....

[Lasercookie]

I'm not exactly sure what you're actually trying to get at, but these are my thoughts. I might be a bit off to what you actually meant though, if I am I apologise in advance.

does Energy cange of reaction : CF x delta T equal to Energy required (4.184 x mass x delta T)

This is probably just a matter of notation, but what are you using CF to stand for? By the value that you've used, you're using it to stand for specific heat capacity. It's probably fine - it's just a matter of what you labelling your variables, I've just gotten used to reading CF as calibration factor.


This is the energy required to give that substance that particular change in temperature.

I'll also just point out on the side that the specific heat capacity for water that VCAA uses gives in the databook is

There's also this for figuring out the calibration factor (which in a sense is a measure of the heat capacity of the calorimeter).


For the energy expelled / released in a reaction inside a calorimeter, once you have the calibration factor, you can rearrange the relationship and get


Well you can write out the equation for the that reaction that occurs, and then find the heat of combustion for whatever moles of hydrogen gas was actually used up in the reaction.

For the thermochemical equation, you need to find , where it's in units of

[destain]

yeah my CF did mean calibration factor,
as in does this equation 'CF x DeltaT' = '4.18 x mass x DeltaT'
Do those two equations figure out the same thing just that it might be in different units and according to what information the question gives you?

And yeah that was the problem, I don't know how to write out the equation of Hydrogen gas burning in a calorimeter LOOOOOOOOOOOOOOOOOOL
oh wait is it just H2 + O2?
is that all you do in every aswer, just add O2