5000 ppm lead by weight is equivalent to what percentage by weight?

5000 ppm lead by weight is equivalent to what percentage by weight?

• A. 0.05%
• B. 0.5%
• C. 5%
• D. 50%

Answer: (B)

Concentrations are often given in both percent by weight and parts per million (ppm). A simple conversion is that 1% equals 10,000 ppm, so to go from ppm to percent you divide by 10,000. For 5,000 ppm, divide by 10,000: 5,000 / 10,000 = 0.5%. So the equivalent percent by weight is 0.5%. To see why the other options don’t fit: 0.05% corresponds to 500 ppm, not 5,000 ppm; 5% corresponds to 50,000 ppm; and 50% corresponds to 500,000 ppm.

Concentrations are often given in both percent by weight and parts per million (ppm). A simple conversion is that 1% equals 10,000 ppm, so to go from ppm to percent you divide by 10,000.

For 5,000 ppm, divide by 10,000: 5,000 / 10,000 = 0.5%. So the equivalent percent by weight is 0.5%.

To see why the other options don’t fit: 0.05% corresponds to 500 ppm, not 5,000 ppm; 5% corresponds to 50,000 ppm; and 50% corresponds to 500,000 ppm.