What is the formula for calculating the weight percentage of lead in a paint chip?

The formula for calculating the weight percentage of lead in a paint chip is the ratio of the weight of lead in the sample to the total weight of the subsample, expressed as a percentage. This method allows for a clear understanding of how much lead is present in the paint relative to the overall weight of the sample. Using the formula, you take the weight of lead and divide it by the subsample weight, then multiply by 100% to convert it to a percentage.

This calculation is crucial in assessment practices because it quantifies lead exposure risk, which is important for compliance with safety regulations and for ensuring public health, especially in environments where children may be exposed to lead in paint. Understanding the correct method allows risk assessors to evaluate and communicate potential dangers effectively.

The other options either misrepresent the relationship needed for the percentage calculation or involve different measurements that do not accurately reflect the percentage of lead in the paint. Thus, they do not appropriately answer the question posed about calculating the weight percentage of lead.