Question

which has more mass, a 0.3 g rock or a 30.0 mg rock?
the 0.3 g rock
the 30.0 mg rock
neither, they are equal in mass.
cannot solve this problem because grams are not used for mass.

Explanation:

Step1: Convert units

Convert \(30.0\) mg to grams. Since \(1\) g \( = 1000\) mg, then \(30.0\) mg \(=\frac{30.0}{1000}\) g \( = 0.03\) g.

Step2: Compare masses

Compare \(0.3\) g and \(0.03\) g. Since \(0.3>0.03\).

Answer:

The \(0.3\) g rock.