Question

the rda for the trace element selenium is 0.000070 g/day. express this dose in mg/day. express your answer in milligrams per day.

Explanation:

Step1: Recall the conversion factor between grams and milligrams.

We know that \(1\space g = 1000\space mg\), so to convert grams to milligrams, we multiply by \(1000\) (or \(10^{3}\)).

Step2: Convert the given value from grams to milligrams.

The given RDA for selenium is \(0.000070\space g/day\). To convert this to \(mg/day\), we use the conversion factor:
\[
0.000070\space g/day\times\frac{1000\space mg}{1\space g}
\]
First, calculate \(0.000070\times1000\). \(0.000070\times1000 = 0.070\) (since moving the decimal point three places to the right in \(0.000070\) gives \(0.070\)).

Answer:

\(0.070\space mg/day\)