Question

1. Potassium (K) has an atomic mass of 39.0983 amu and only two naturally-occurring isotopes. The K-41 isotope (40.9618 amu) has a natural abundance of 6.7302%. What is the mass (in amu) of the other isotope

Answer 1

38.96383282 amu

Explanation:

39.0983 = (40.9618 0.067302) + ( ? (1-0.067302)

39.0983 = 2.756811064 + ( ? 0.932698)

subtract 2.756811064 from both sides

36.34148894 = ( ? 0.932698)

divide both sides by 0.932698

? = 38.96383282 amu

Answer 2

38.96383282 amu

Step-by-step explanation:

39.0983 = (40.9618
`*` 0.067302) + ( ?
`*` (1-0.067302)

39.0983 = 2.756811064 + ( ?
`*` 0.932698)

subtract 2.756811064 from both sides

36.34148894 = ( ?
`*` 0.932698)

divide both sides by 0.932698

? = 38.96383282 amu