Posted by **michelle** on Monday, January 8, 2007 at 1:18am.

what is the kinetic energy, in J, of

a)an Ar atom moving w/ a speed of 650m/s

b)a mole of Ar atoms moving w/ a speed of 650m/s?

a) K.E. = (1/2) M V^2

For M, use the mass of an Argon atom. It equals 0.040 kg (40 g) divided by Avogadro's number. M must be in kg to get the K.E. in Joules

b) Multiply the (a) result by Avogadro's number.

thanx

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