Question

determine the mass in grams that are in 1 molecule of i₂?

Explanation:

Step1: Calculate molar mass of \(I_2\)

The atomic mass of \(I\) (iodine) is \(126.9\space g/mol\). For \(I_2\), molar mass \(M = 2\times126.9\space g/mol=253.8\space g/mol\)

Step2: Use Avogadro's number

Avogadro's number \(N_A = 6.022\times 10^{23}\space mol^{-1}\). Mass of one molecule \(m=\frac{M}{N_A}\)
Substitute \(M = 253.8\space g/mol\) and \(N_A=6.022\times 10^{23}\space mol^{-1}\)
\(m=\frac{253.8}{6.022\times 10^{23}}\space g\)
\(m = 4.214\times 10^{-22}\space g\)

Answer:

\(4.214\times 10^{-22}\space g\)