The masses of : \"font-size:12pt;line-height:115%;\">2 \"font-size:12pt;line-hei

Question

The masses of :

"font-size:12pt;line-height:115%;">2

"font-size:12pt;line-height:115%;">1

"font-size:12pt;line-height:115%;">H

"font-size:12pt;line-height:115%;">,

147N,

126C,

42He,

73Li and

94Be

"font-size:small;">are 2.014102 u, 14.003074 u, 12.000000 u,

4.023602 u, 6.941 u and 9.012182 u, respectively. What is the

Q-value of this reaction? Note that 1 u=931.494

MeV.

"font-size:12pt;line-height:115%;">

"font-size:small;">A. 1870 MeV

"font-size:12pt;line-height:115%;">

"font-size:small;">B. -5.99 MeV

"font-size:12pt;line-height:115%;">

"font-size:small;">C. _2723.5 MeV

"font-size:12pt;line-height:115%;">

"font-size:small;">D. -4650 MeV

"font-size:12pt;line-height:115%;">

"font-size:small;">PLEASE SHOW WORK!!

"font-size:12pt;line-height:115%;">

Explanation / Answer

which reaction ?

is it

H+N+C=He+Li+Be

so mass defect=2.014102+14.003074+12-4.023602-6.941-9.012182

=8.04 u

so eneryg=931.494*8.04

=7849 MeV

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