Question

The energy diagram shown represents the chemical reaction between solid ammonium chloride and solid barium hydroxide octahydrate: 2NH4Cl(s)+Ba(OH)2*8H2O(s)->2NH3(aq)+BaCl2(aq)+10H2O(l). The heat reaction for this reaction is 54.8kJ . How much energy would be absorbed if 24.9g of NH4Cl reacts?

Answer 1

that heat is it in kJ/mol or kJ/g

Answer 2

I typed it word for word. It doesn't specify.

Answer 3

It has a (triangle) H in it.

Answer 4

We have to answer in kilojoules

Answer 5

ok is that (triangle = greek letter delta and it means difference between in this case difference in enthalpy at the begining and at the end of the reaction) so does that delta H have index "m" like:
\[\Delta H _{m} \]

Answer 6

No, it does not.

Answer 7

ok we need to find out what is the amount in 24,9 g
n=m/M = 24,9 g/ 53,482 gmol-1 = 0,4656 mol
so if for reaction there is necesary 2 moles of reactant NH4Cl than we have now ratio as follows:
0,4656/2 = 0,2328
so heat necesary is:
0,2328 * 54,8 kJ = 12,75 kJ
this is at least how i would solve it...

Answer 8

12.43KJ

Answer 9

ur right kryten

Answer 10

it should be 12.43 KJ not 1243KJ

Answer 11

2 mole of NH4Cl mean -2*mol wt of NH4Cl=2*54=108 gram
if 108 gram gives 54.8 KJ
then 24.9 gram gives=54.8*24.9/108 =12.43KJ

Answer 12

you calculated with mass and i with moles but in esence premisse is the same...

Answer 13

yaaaa just i showed how fun is chemistry !!!ur right !!!but last answer u put is coma after 12is not correct !!

Answer 14

12.43 is not correct. :(

Answer 15

then what is correct

Answer 16

I didn't get it yet.

Answer 17

what option they have given tell me

Answer 18

12.8 is the fina answer. Thanks for your help.

Answer 19

no its not