Chemistry problem help?

Question

An atom of 179Ta has a mass of 178.945930 amu. Calculate the binding energy per MOLE in kJ. Use the values:

mass of 1H atom = 1.007825 amu

mass of a neutron = 1.008665 amu

c = 2.99792 x 10^8 m/s

Give your answer to 3 significant figures and USE E notation.

Answer 1

http://library.thinkquest.org/17940/text...

Eb = binding energy, in MeV

Z = number of protons

m H = mass of a hydrogen atom (1.007825amu)

N = number of neutrons

m n = mass of a neutron (1.008665 amu)

m isotope = actual mass of the isotope

931.5 Mev/amu = the conversion factor to convert mass into energy, in units of MeV

Eb= [(Z × m H ) + (N × m n) - (m isotope)](931.5 MeV/amu)

=[(73 x  1.007825 amu) + (106 x  1.008665 amu) - (m 179)](931.5)

= [73.571225 + 106.91849  - 178.945930] (931.5 Mev/amu)

= (1.543785)(931.5 Mev / amu)

= 1438 Mev per atom

@ 6.022e23 atoms per mole = 8.65985e26  Mev per mole

@ 1 megaelectronvolt = 1.6021773e-16 kilojoule

or       http://www.onlineconversion.com/energy.h...

1.39 e11 kilojoule per mole

your answer