I need to calculated moles of KI?

You cannot use the gas law equation for this problem, because KI is a solid, not a gas at 25°C.

You cannot calculate the moles of KI from a volume of KI, but a mass of KI. I will assume that you mean that you have 12g KI

12g KI = 12/165.99 = 0.072 mol KI.

Please check the question carefully, because as it is presented, it does not make any sense.

The only other alternative I can offer is that the question refers to HI, whick is a gas, and can be measured in ml volume, but then the molar mass is not 165.99. Please revert if there is some error in what you have submitted.

formula: PV=nRT

want: mol KI

given: 25oC, 12 mL

know: P is constant= 1 atm, R is constant= .0821 L*atm/mol*K

step 1: id values and plug into eqn to solve for n

step 2: check ans

n=PV/RT = (1 atm) x(12 x10^-3 L)/(.0821 L*atm/mol*K) x(25+273= 298 K) = 4.9 x10^-5 mol

Note: molar mass is not need it as this is an ideal gas problem when given T, and V is given.