Respuesta :

[tex]500\text{ppm}\times\frac{1percent}{10000\text{ppm}}=0.05[/tex]

500ppm = 0.05%

Now, express the percentage as a fraction:

0.05/100 = 1/2000

Therefore:

[tex]500\text{ppm}=\frac{1}{2000}[/tex]

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