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34 solutions

Isotopes

Q. The imaginary nonmetal E has two isotopes, 50E (isotopic mass 49.9715 amu, abundance 16.938%), 52E (isotopic mass 51.9663 amu). Calculate the atomic mass of E as it would appear in the periodic table.

Solved • Oct 24, 2019

Isotopes

Q. A hypothetical element, Q, has two stable isotopes, 31Q (isotopic mass = 30.91 amu) and 35Q (isotopic mass = 34.91 amu). If the atomic mass of Q in the periodic table is 33.5 amu, what is the percent abundance of 35Q? Enter your answer in decimal format with three decimal places and no units. (Example answer 27.231)

Solved • Oct 21, 2019

Isotopes

Q. Nitrogen (N2) is made up of 99.632% 14N and 0.368% 15N. The atomic mass of 14N is 14.003 amu. The atomic mass of 15N is 15.000 amu. What is the average atomic mass of nitrogen?

Solved • Oct 9, 2019

Isotopes

Q. Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the following masses and natural abundances: X-45 44.8776 amu 32.88% X-47 46.9443 amu 67.12%

Solved • Sep 23, 2019

Isotopes

Q. The water found on Earth is almost entirely made up of the 1H and 16O isotopes for a formula of H2O and a molecular mass of 18.0 amu. What is the largest mass that a water molecule could have using other isotopes?

Solved • Sep 23, 2019

Isotopes

Q. Naturally occurring magnesium has an atomic mass of 24.312 and consists of three isotopes. The major isotope is 24Mg, natu- ral abundance 78.99%, relative atomic mass 23.98504. The next most abundant isotope is 26Mg, relative atomic mass 25.98259. The third most abundant isotope is 25Mg, whose natural abun- dance is in the ratio of 0.9083 to that of 26Mg. Find the relative atomic mass of 25Mg.

Solved • Sep 19, 2019

Isotopes

Q. 25- The average atomic masses of some elements may vary, depending upon the sources of their ores. Naturally occurring boron consists of two isotopes with accurately known masses (10B, 10.0129 amu and 11B, 11.00931 amu). The actual atomic mass of boron can vary from 10.807 to 10.819, depending on whether the mineral source is from Turkey or the United States. Calculate the percent abundances leading to the two values of the average atomic masses of boron from these two countries.

Solved • Sep 19, 2019