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Silas B
Silas B asked in Science & MathematicsChemistry · 1 decade ago

What is the atomic weight of this element?

A newly discovered element has two isotopes. One has an atomic weight of 120.9038 amu with 57.25% abundance. The other has an atomic weight of 122.8831 amu. What is the atomic weight of this element?

A) 122.15 amu

B) 122.38 amu

C) 121.75 amu

D) 123.45 amu

E) 121.17 amu

F) 121.54 amu

3 Answers

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  • Be Positive!!!
    Lv 7
    1 decade ago
    Favorite Answer

    C) 121.75 amu

    Source(s): 120.9038 x 57.25 = 6921.74255 122.8831 x 42.75 = 5253.25252 6921.74255 + 5253.25252 = 12174.9951 12174.9951/100 = 121.749952 amu
  • domenice
    Lv 4
    4 years ago

    Atomic quantity ( Z ) is the style of protons interior the nucleus of that atom. Atomic mass ( A ) is the sum of protons and neutrons. style of neutrons = A - Z besides for oxygen atomic quantity ( Z ) = 8 yet A = sixteen For hydrogen Z = a million, A would nicely be a million,2, 3 reckoning on the isotope. So needless to say Z is often the comparable for a factor yet A can selection. wish this helps! click on source for extra examining.

  • None
    Lv 7
    1 decade ago

    C.

    (120.9038 x 0.5725) + (122.8831 x 0.4275)

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