Exxon Mobil Basic Operating Training Practice Test

How do you convert percent concentration to parts per million (PPM)?

Multiply percent by 10,000. Divide percent by 10,000. Multiply percent by 1,000. Subtract percent from 100,000.

Correct Answer:

Multiply percent by 10,000.

Explanation:

Percent concentration is parts per hundred, while ppm is parts per million. That means 1% equals 10,000 ppm, because 0.01 × 1,000,000 equals 10,000. So you multiply the percent value by 10,000 to get ppm. For example, 0.75% becomes 7,500 ppm. Dividing by 10,000 would give a much smaller number, multiplying by 1,000 would yield a result far too small, and subtracting from 100,000 isn’t a valid conversion.

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