O 6/1/2015 11:00 PM A 88.4/100 6/1/2015 01:55 PM Gradebook Print Calculator Peri

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O 6/1/2015 11:00 PM A 88.4/100 6/1/2015 01:55 PM Gradebook Print Calculator Periodic Table Incorrect Question 18 of 19 incorrect Map sapling earning For the following fusion reaction, calculate the change in energy of the Atom or Mass reaction in units of joules per mole. particle (amu) H-1 1.00782. He H-2 201 10 H-3 301605 Number He-3 3.01603 He-4 4.00260 5.2383 x 10 13 J mol neutron 1.00866 Incorrect. Energy is released in this reaction. What does that tell you about the sign of AE? Also, you need to scale the energy up to correspond to the production of a mole of helium atoms, not just one helium atom Previous 8 Give Up & View Solution & Try Again Next D Exit

Explanation / Answer

The energy can be calculated by calculating the change in mass during the fusion reaction.

Mass of Deuterium = 2.01410 amu

Mass of Helium -3 = 3.01063

Mass of neutron = 1.00866

Mass of reactant = 2.01410 + 2.01410 = 4.0282 amu

Mass of products = 3.01063 + 1.00866 = 4.01929

Difference in mass = -0.00891

1 amu = 1.4923 X 10^ -10 joule

so 0.00891 amu = -0.013296 X 10^-10 = -13.296 X 10^-13 J / atom

Now to convert it into J/mole multiply with avagadro number

-13.296 X 10^-13 X 6.023 X 10^23 = 80.0818 X 10^10 J / mole

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