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Professional:
@Vocaloid
Vocaloid:
percent 14N * (mass 14N) + percent 15N * (mass 15N)
Vocaloid:
still there?
Professional:
yes
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Professional:
question...what's 14N e.e
Vocaloid:
nitrogen with mass number 14 re-read the problem carefully
Professional:
B
Vocaloid:
yup good
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