In the same powder, how many grams of caffeine are present?

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Multiple Choice

In the same powder, how many grams of caffeine are present?

Explanation:
The main idea is that the caffeine content by mass is fixed for a given powder. If you have the same powder, the amount of caffeine scales directly with how much powder you have. So you determine grams of caffeine by multiplying the powder mass by the caffeine concentration (as a decimal). In this scenario, applying that proportional relationship gives 126 g of caffeine in the specified amount of powder. The other numbers would come from using a different amount of powder or a different concentration, which would break the fixed proportion and don’t match the given setup.

The main idea is that the caffeine content by mass is fixed for a given powder. If you have the same powder, the amount of caffeine scales directly with how much powder you have. So you determine grams of caffeine by multiplying the powder mass by the caffeine concentration (as a decimal). In this scenario, applying that proportional relationship gives 126 g of caffeine in the specified amount of powder. The other numbers would come from using a different amount of powder or a different concentration, which would break the fixed proportion and don’t match the given setup.

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