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Q. The atomic weight of Rubidium is 85.4678amu. The 2 naturally occuring isotopes of Rubidium have the following masses: 85Rb, 84.9118amu; 87Rb, 86.9092amu. Calculate the percent of 85Rb in naturally occuring Rubidium.

Solved • Aug 13, 2019


Q. Lithium has two naturally occurring isotopes. 6Li and 7Li, with masses of 6.015 amu and 7.016 amu respectively. What is the relative abundance of each isotope?

Solved • Jul 5, 2019


Q. Two isotopes of hypothetical element X exist with abundances of 30.00% 111x and 70.00% 101X. What is the approximate atomic mass of X (in atomic mass units, amu)?

Solved • Jul 1, 2019


Q. Average mass of Bromine is 79.90. There are two main isotopes in nature, which are 79Br and 81Br, so what are the percent abundant of each isotope.

Solved • Jun 18, 2019


Q. There are three naturally occurring isotopes of potassium. Use the following information to calculate the amu of potassium 40. Use four or more significant figures for this calculation where possible.potassium-39 abundance of 93.258% and amu of 38.9637 potassium-41 abundance of 6.730% and amu of 40.9618

Solved • May 22, 2019