Question

determine the mass in grams of 2.91 moles of licl.

Explanation:

Step1: Find molar mass of LiCl

Lithium (Li) molar mass: \(6.94\space g/mol\), Chlorine (Cl) molar mass: \(35.45\space g/mol\).
Molar mass of \(LiCl = 6.94 + 35.45 = 42.39\space g/mol\).

Step2: Calculate mass using \(mass = moles \times molar\space mass\)

Given moles \(= 2.91\space mol\), molar mass \(= 42.39\space g/mol\).
\(mass = 2.91\space mol \times 42.39\space g/mol\).
\(mass = 2.91 \times 42.39 \approx 123.35\space g\).

Answer:

\(123\space g\) (or more precisely \(123.35\space g\))