Given the following sets of values, calculate the unknown quantity.

a. P= 1.50 atm, V = unknown, n = 0.005 mol, T = 0 °C

b. P=unknown, V = 10.00 L, n = 0.08 mol, T = 17 °C

c. P = 6.00 atm, V = 2.0.00 L, n = unknown, T = 47 °C