Problem: An unknown element E is found to have two isotopes. The atomic mass of E is 57.15 amu. The mass of the first isotope E - 56 is 56.482 amu, and its natural abundance is 69.19%. Calculate the mass of the second isotope of E? a. 68.38 amu b. 54.98 amu c. 58.65 amu d. 57.82 amu e. 56.82 amu

FREE Expert Solution
82% (438 ratings)
Problem Details

An unknown element E is found to have two isotopes. The atomic mass of E is 57.15 amu. The mass of the first isotope E - 56 is 56.482 amu, and its natural abundance is 69.19%. Calculate the mass of the second isotope of E?

a. 68.38 amu

b. 54.98 amu

c. 58.65 amu

d. 57.82 amu

e. 56.82 amu

Learn this topic by watchingAtomic Mass Concept Videos
All Chemistry Practice Problems Atomic Mass Practice Problems
Q.There are two isotopes of the element gallium that appear in nature, 69Ga (M = 68.926 amu) and 71Ga (M = 70.924 amu). Given that the average atomic ma...
Q.An unknown element, X, has three naturally occurring isotopes. The masses of the three isotopes are 54.335, 59.345 and 62.349 The two have a percent a...
Q.Which of the following symbols represent isotopes of nitrogen? a. i only b. ii only c. iii only d. i and ii e. i and iii
Q.The element X has three naturally occuring isotopes;  aX, bX, and cX, where a, b, and c represent the mass number. The masses (amu),except aX, and the...
See all problems in Atomic Mass

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Atomic Mass concept. You can view video lessons to learn Atomic Mass. Or if you need more Atomic Mass practice, you can also practice Atomic Mass practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofAn unknown element E is found to have two isotopes. The atom...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 4 minutes and 20 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Polanco's class at UF.