Answer:
The answer is because they are not a substance, but a mixture of organic compounds.
Step-by-step explanation:
A range of values is used because they are not a substance, but a mixture of organic compounds that has a range of molar masses. Corn syrup contains glucose in not less than 70% by weight of total solids and a reducing sugar content of 20% by weight on a dry basis. The composition of gasoline depends on the source from which it is extracted, therefore it has different molar masses. A gasoline with a long carbon chain is heavy and has a higher mass for a fixed volume, so its density will increase. Any change affecting the product will lead to an increase or decrease in density.
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