I need help plz i do not get this at all
What is the kinetic energy, in J, of:
(A) an Ar atom moving with a speed of 650m/s?
(B) a mole of Ar atoms moving with a speed of 650m/s (Hint: 1 amu =1.66 * 10^-27 kg)?

Question

I need help plz i do not get this at all 
 What is the kinetic energy, in J, of:
(A) an Ar atom moving with a speed of 650m/s?
(B) a mole of Ar atoms moving with a speed of 650m/s (Hint: 1 amu =1.66 * 10^-27 kg)?

nali · Answer

@Sheng @Preetha @oOKawaiiOo  plz anyone help

anonymous · Answer

From my Chem book, Nali:

$$KE = 1/2 mv ^{2}$$

nali · Answer

well i know that but i need help finding the mass like last time

anonymous · Answer

So, KE = 1/2 (the mass of one atom of Ar)(650 m/s)^2

anonymous · Answer

Did you find the mass of a single atom of Ar from the last question?

nali · Answer

yes i found it 

it is 6.63 x 10^ -26 kg

anonymous · Answer

KE=1/2 (it is 6.63 x 10^ -26 kg)(650 m/s)^2

I'll do my math...

nali · Answer

i need help with part 2

anonymous · Answer

Isn't one mole of Ar 39.948 g?  So it would follow KE = 1/2 (39.948 g)(650 m/s)^2.
Please double check my work, though.

nali · Answer

no u have to use both amu and avargado's number

anonymous · Answer

I'm sorry that wasn't correct.  I'll be following this so that I can get the correct answer, too.

nali · Answer

it is ok    thanku for trying