Determine whether refrigerant R-410a in each of the following states is a compressed liquid, a superheated vapor, or a mixture of saturated liquid and vapor.

a. 50^◦C, 0.05 m³/kg

b. 1.0 MPa, 20^◦C

c. 0.1 MPa, 0.1 m³/kg

d. −20^◦C, 200 kPa