Question

Methane molecules (CH4) moving in air have an average velocity of 684 m/s. What is the kinetic energy of 1.00 mol of methane molecules in air?

11.0 J

5.49 x 103 J

5.49 J

3.75 x 106 J

3.75 x 103 J

Answer 1

KE = 1/2 mv^2

v   = 684m/s

mass of CH4 = no of moles * gram molar mass

                        = 1*16 = 16g   = 16*10^-3 kg   = 0.016Kg

KE   = 1/2*(0.016)*(684)^2

        = 7485.7/2 = 3742J

                            = 3.72*10^3 J

3.75 x 10^3 J >>>>answer