Chemistry

Element X has two natural isotopes:X-6 (6.015amu) and X-7 (7.016amu). calculate the atomic mass of element X given the abundance of X-7 is 92.5%.
a)12.5amu
b)6.50amu
c)6.09amu
d)6.52amu
e)6.94amu

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  1. If X-7 is 92.5%, then X-6 must be 100-92.5 = 7.5%
    Then 6.015(0.075) + 7.016(0.925) = ??

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  2. 6.4 aum

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  3. 6.940925 amu

    Can be rounded off to two decimal places as 6.94 amu

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  4. Element A has two isotopes. The first isotope is present 17.7% of the time and has a mass of 248.89. The second isotope has a mass of 206.58. Calculate the atomic mass of element A.

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  5. 6.94amu

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  6. Element X has two naturally occurring isotopes, X-6 which has a percent abundance of 92.41%, and X-7 which has an unknown abundance. Determine the percent abundance of X-7.

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