Final answer:
The mass fraction of an analyte in bulk composition is given as a percentage, calculated by dividing the mass of the analyte by the total mass of the sample and multiplying by 100%.
Step-by-step explanation:
The mass fraction of a given analyte in the bulk composition, such as from X-Ray Fluorescence (XRF) testing, is given as a percentage. The percentage represents the ratio of the mass of the analyte to the total mass of the sample, multiplied by 100%. This allows for a convenient representation of the composition and comparison between different samples.
For example, if the mass fraction of a given analyte is 2%, it means that 2 grams of the analyte is present in every 100 grams of the sample.
In summary, the mass fraction of an analyte is given as a percentage, which is calculated by dividing the mass of the analyte by the total mass of the sample and multiplying by 100%.