Mathematics

Problem

An alloy sample has a total mass of

2.50\,\text{g}

and contains

35.0\,\text{mg}

of copper. What is the concentration of copper in the alloy expressed in parts per million (ppm)? a)

8.8\times10^{3}\,\text{ppm}

1.4\times10^{5}\,\text{ppm}

1.4\times10^{4}\,\text{ppm}

1.4\times10^{2}\,\text{ppm}