exp 7 enthalpy

Question 1

what is qrxn equal to

Answer 1

delta h system

-qsoln

Question 2

when does enthalpy decrease? increase?

Answer 2

when exothermic (below 0)
when  endothermic (above 0)

Question 3

what is q sys + q surr equal to

Answer 3

0

Question 4

what is qsoln equal to

Answer 4

m c delta t

Question 5

what is delta H^0r equation

Answer 5

qrxn/qLR

Question 6

how do we find the LR?

Answer 6

Determine the balanced chemical equation for the chemical reaction.
Convert all given information into moles (most likely, through the use of molar mass as a conversion factor).
Calculate the mole ratio from the given information. Compare the calculated ratio to the actual ratio.
Use the amount of limiting reactant to calculate the amount of product produced.
If necessary, calculate how much is left in excess of the non-limiting reagent.

Question 7

how do we find msoln?

Answer 7

d x v

Question 8

determine heat capacity of calorimeter equation

Answer 8

q cal + q cold +q hot = 0

Ccal (tfin - tini) + m cold x C (tfin-tinicold) + mhot x C (tfin-tinihot) = 0

Question 9

standard enthalpies calculation

Answer 9

mols x enth products - same but reactants

all subtraction