Final answer:
The correct estimated ppm for acetone gas is 4000 ppm, which corresponds to a measurement of 20% on a combustible gas meter. The correct option is (B).
Step-by-step explanation:
The correct estimated ppm for acetone gas is 4000 ppm, which corresponds to a measurement of 20% on a combustible gas meter. To understand why, we need to know that ppm stands for parts per million, which is a unit used to measure the concentration of a substance in a mixture. In this case, the gas meter is measuring the concentration of acetone gas in the air.
If the measurement on the gas meter is 20%, it means that the gas meter detected 20 parts of acetone gas for every 100 parts of air. To convert this percentage to ppm, we multiply it by 10,000. So, 20% x 10,000 = 2000 ppm.
However, it is important to note that the question asks for the estimated ppm if the gas present is acetone. Acetone has a higher combustibility compared to other gases, so based on this information, we can estimate that the actual ppm would be higher than the measured percentage. Therefore, the correct option is B) 4000 ppm.