Final answer:
94.9% of a naturally occurring sulfur sample is sulfur, therefore the remainder, which is not sulfur, is 5.1% of the sample. To find this, subtract the percentage of sulfur from 100%.
Step-by-step explanation:
The student asked how much of a naturally occurring sulfur sample is not sulfur if sulfur makes up 94.9% of it. The remainder of the sample would be the 100% total minus the 94.9% that is sulfur. So the percentage that is not sulfur is 100% - 94.9% which equals 5.1%.
Therefore, the correct answer is 5.1%, representing the portion of the sample that does not consist of sulfur. When calculating percent composition, it's important to remember that all percentages should add up to 100%. This underscores the fundamental concept of percent composition in chemistry, where every part of a sample is accounted for in percentage terms.