Final answer:
60% ethanol (EtOH) by volume is equivalent to 120 proof, since the proof is twice the alcohol percentage by volume. Therefore, the answer is b. 120 proof.
Step-by-step explanation:
The question asks what proof 60% ethanol (EtOH) corresponds to. The term proof is used to describe the alcohol content of spirits for consumption. In the United States, the proof is twice the percentage of alcohol by volume. Therefore, to calculate the proof from the percentage, you can multiply the percentage by two.
In this case, we have:
- 60% EtOH by volume
- Multiplying by 2 gives us: 60% × 2 = 120 proof
Thus, 60% ethanol by volume corresponds to 120 proof, which is choice b. 120 proof.