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Question 13 < > Element A has two isotopes. The first isotope is present 18.38% of...
Element A has two isotopes. The first isotope is present 15.68% of the time and has a mass of 237.41. The second isotope has a mass of 207.29. Calculate the atomic mass of element A.
< Question 4 of 17 > Suppose that a fictitious element, X, has two isotopes: 59X (59.015 amu) and "x (62.011 amu). The lighter isotope has an abundance of 75.7%. Calculate the average atomic mass of the element X average atomic mass:
Element A has two isotopes. The first isotope is present 36.76% of the time and has a mass of 139.31. The second isotope has a mass of 111.16. Calculate the atomic mass of element A. (To two decimals places)
element A has two isotopes. The first isotope is pressnt 18.48% of the time and has a mass of 135.24. The second isotope has a mass of 116.1. calculate the atomic mass of element A
A fictional element has two isotopes and a molar mass of 82.55 g/mol. The first isotope has an atomic mass of 81.01 u and 24.56 % of the element's atoms are this isotope. What is the atomic mass (in u) of the second isotope?
8. An element has two naturally occurring isotopes. Isotope 1 has a mass of 120.9038 amu and a relative abundance of 57.4%. Isotope 2 has a mass of 122.9042 amu. Find the atomic mass of this element and, by comparison to the periodic table, identify it.
1. An element has two naturally occurring isotopes. Isotope 1 has a mass of 120.9038 amu, and a relative abundance of 57.4%. Isotope 2 has a mass of 122.9042, and a relative abundance of 42.6%. Find the atomic mass of this element and identify it by name and symbol.
Suppose a new element is discovered and it has two stable isotopes. One isotope has a mass of 72.550 u and an abundance of 38.44%. The average atomic mass of the element is 70.565 u. What is the mass of the second isotope? mass of isotope: about us creen privacy policy terms of use contact us help
The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138 and lanthanum- 139. The isotope lanthanum-138 has a mass of 138 amu and a percent natural abundance of 8.90X10-2 %. The isotope lanthanum-139 has a percent natural abundance of 99.9%. What is the mass of lanthanum-1392 A certain element consists of two stable isotopes. The first has a mass of 113 amu and a percent natural abundance of 4.28 %. The second has a...
Two isotopes of a certain element have binding energies that differ by 13.03 MeV. The isotope with the larger binding energy contains one more neutron than the other isotope. Find the difference in atomic mass between the two isotopes. __ u