Answer to Question #325125 in General Chemistry for Lex

Question

Mole of Ar atoms moving at 650 m/s

Answer 1

Molar mass of Argon, Ar = 39.95 g

Mass of 1 atom, m = 39.95 / (6.023 × 10²³) = 6.64 × 10^-23 g = 6.64 × 10^-26 kg

Now, Kinetic Energy, KE = (1/2) × m × v² where velocity, v = 650 m/s and mass of 1 atom, m = 6.64 × 10^-26 kg

KE = (1/2) × 6.64 × 10^-26 kg × (650 m/s)² = 1.4 × 10^-20 J