Final answer:
The abundance of an element in nature and its percent composition are related by the equation: Abundance = Percent Composition ÷ Atomic Mass.
Step-by-step explanation:
The abundance of an element in nature and its percent composition are related by the equation: Abundance = Percent Composition ÷ Atomic Mass.
For example, let's consider carbon. Naturally occurring carbon is largely a mixture of two isotopes: 98.89% ¹²C (mass 12 amu) and 1.11% 13C (mass 13.003355 amu). The percent composition of ¹²C in carbon is 98.89%. To calculate the abundance of ¹²C, we divide the percent composition by its atomic mass: 98.89 ÷ 12 = 8.24. This means that ¹²C makes up approximately 8.24% of the naturally occurring carbon.
So, the correct answer to your question is d) Percent Composition = Abundance ÷ Atomic Mass.