Question

a chemist measures the amount of fluorine gas produced during an experiment. he finds that 24.4 g of fluorine gas is produced. calculate the number of moles of fluorine gas produced. be sure your answer has the correct number of significant digits.

Explanation:

Step1: Recall molar mass of \( F_2 \)

Molar mass of \( F \) is \( 19.00 \, g/mol \), so for \( F_2 \), molar mass \( M = 2\times19.00 = 38.00 \, g/mol \).

Step2: Use moles formula \( n=\frac{m}{M} \)

Given mass \( m = 24.4 \, g \), molar mass \( M = 38.00 \, g/mol \).
\( n=\frac{24.4}{38.00} \)

Step3: Calculate the value

\( n = 0.642105\cdots \approx 0.642 \, mol \) (3 significant digits as 24.4 has 3).

Answer:

\( 0.642 \)