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)?

anonymous · Answer

I need help with finding the mass of the Ar atom plz and thank you

aaronq · Answer

use the formula:  Kinetic Energy = $mv^2$

anonymous · Answer

thank you

anonymous · Answer

Now I have a question about Hess's Law 

MnO2 + CO  MnO + CO2	H = -151 kJ
Mn3O4 + CO  3MnO + CO2	H = -54 kJ
3Mn2O3 + CO  2Mn3O4 + CO2	H = -142 kJ
A) Use the above thermochemical equations to determine H for the following: 2MnO2 + CO  Mn2O3+ CO2

anonymous · Answer

I know how to do it but I can't figure which equation to flip