Final answer:
The average atomic mass for element X, which is carbon, can be calculated using the masses and abundances of its isotopes.
Step-by-step explanation:
The average atomic mass for element X can be calculated by multiplying the mass of each isotope by its abundance, and then summing up these values. Let's say element X has two isotopes: X-35 and X-37. X-35 has a mass of 35 amu and is 75% abundant, while X-37 has a mass of 37 amu and is 25% abundant. The average atomic mass of X can be calculated as follows:
- Calculate the contribution of each isotope: (35 amu x 0.75) + (37 amu x 0.25) = 35.5 amu
- Therefore, the average atomic mass of X is 35.5 amu.
Based on the information given in the question, element X is carbon (C).