Question

the density of carbon dioxide is 0.0198 grams per cubic centimeter. how is this number written in scientific notation? (a) 1.98×10² (b) 1.98×10³ (c) 1.98×10⁻² (d) 1.98×10⁻³

Explanation:

Step1: Recall scientific - notation form

Scientific notation is $a\times10^{n}$, where $1\leqslant|a|\lt10$ and $n$ is an integer.

Step2: Move the decimal point

For the number $0.0198$, move the decimal point 2 places to the right to get $a = 1.98$. Since we moved the decimal point 2 places to the right, $n=- 2$. So, $0.0198 = 1.98\times10^{-2}$.

Answer:

C. $1.98\times10^{-2}$