how many significant figures are in this mass? 60,100 mg

Explanation:

Step1: Identify significant - figure rules

Non - zero digits are always significant. Zeros between non - zero digits are significant. Trailing zeros in a number without a decimal point may or may not be significant. In the number 60,100, the 6 and 1 are non - zero digits and are significant. The zero between 6 and 1 is also significant. The two trailing zeros are not significant as there is no decimal point.

Step2: Count significant figures

Count the significant digits. We have 6, 0, and 1 as significant digits.

Answer:

3