[hannah]

Umm...Okay the questions is

"The decay of 1 mole of cobalt-60 by beta- emission is represented by the equation:

60          0       60
    C -->    e +       Ni
27         -1       28

How much energy in kilojoules is released in this reaction if the products have .0032 g less mass than the reactant?

So...I think my teacher wanted us to do deltaE=deltamc^2, and I changed the grams to kilograms and ended up with something like 2.88 x 10^13, but the answer in my book says 2.9 x 10^8...so i'm not sure what I did wrong.

Hannah

[peacefulltortoise]

Follow my work here, you can check it again:
dm = 0.000032; c2 = 9.10(16) --> dE = 2.88.10(12) (J).
 So dE ~ 2.9.10(9) (kJ). I think so.

[peacefulltortoise]

Sorry I use (.) instead of (x)
dE = 2.9x10(9) (kJ)

[hannah]

Ohhhhh I think i just missed the kilo part there...Thank you!