Question

now that we know there are 0.010307 g o, how many moles o are in the sample?
? × 10^? mol o
this is not a final result. record at least six digits in the coefficient!

Explanation:

Step1: Recall molar mass of O

Molar mass of O (oxygen) is \( 16.00 \, \text{g/mol} \) (atomic weight from periodic table).

Step2: Use moles formula

Moles \( n = \frac{\text{mass}}{\text{molar mass}} \). Mass is \( 0.010307 \, \text{g} \), molar mass \( 16.00 \, \text{g/mol} \).
\( n = \frac{0.010307}{16.00} \)
Calculate: \( \frac{0.010307}{16.00} = 0.0006441875 \)
Express in scientific notation: \( 6.441875 \times 10^{-4} \)

Answer:

\( 6.441875 \times 10^{-4} \)