Question

how many sig figs are in 2.00000000 ?

Explanation:

Step1: Recall sig - fig rules

Non - zero digits are always significant. Zeros between non - zero digits are significant. Trailing zeros after a decimal point are significant.

Step2: Count sig figs in 2.00000000

The digit 2 is significant, and all 8 zeros after the decimal point are also significant. So there are 9 significant figures.

Answer:

9