How many moles of gas do you have at 3.4 atm, 500 ml and 45 degrees celcius

To find the number of moles of gas we can use the ideal gas law equation 
PV = nRT
where P - pressure  - 3.4 atm
V - 0.500 L 
n - number of moles 
R - universal gas constant - 0.0821 L.atm/mol.K
T - temperature in kelvin - 45 °C + 273 = 318 K
substituting these values in the equation 
3.4 atm x 0.500 L = n x 0.0821 L.atm/mol.K x 318 K
n = 0.065 mol 
0.065 mol of gas is present 

It is true because i have took the test and it came out to be true

Exothermic,  physical change after it is already baked