A new compound was recently discovered and found to have an atomic weight of 342

Question

A new compound was recently discovered and found to have an atomic weight of 342.38 amu. This element has two isotopes, the lighter of which has a mass of 340.91 amu and an abundance of 68.322%. What is the mass of the heavier isotope? A) 350.21
B) 345.55
C) 342.38
D) 348.67
E) 343.29
A new compound was recently discovered and found to have an atomic weight of 342.38 amu. This element has two isotopes, the lighter of which has a mass of 340.91 amu and an abundance of 68.322%. What is the mass of the heavier isotope? A) 350.21
B) 345.55
C) 342.38
D) 348.67
E) 343.29
A new compound was recently discovered and found to have an atomic weight of 342.38 amu. This element has two isotopes, the lighter of which has a mass of 340.91 amu and an abundance of 68.322%. What is the mass of the heavier isotope? A) 350.21
B) 345.55
C) 342.38
D) 348.67
E) 343.29

Explanation / Answer

B) 345.55

let x is the mass of heavier isotope.

the abundance of x = 100 - 68.322

= 31.678 %

use

340.91*0.68322 + x*0.31678 = 342.38

==> x = 345.55

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