Question

Which units express specific heat capacity?
J/°C, J/K, cal/°C, cal/K
J/(gi°C), J/(giK), cal/(gi°C), cal/(giK)
J, cal
°C, K

Answer 1

Specific heat capacity has units of energy per mass per temperature. From your list that is the second line — e.g.:
- J/(g·°C), J/(g·K), cal/(g·°C), cal/(g·K)

(Proper SI form is J/(kg·K) or J·kg⁻¹·K⁻¹; J/(kg·°C) is also used because a 1 K change = 1 °C change.)

Notes: J/°C or cal/°C are (total) heat capacity, J or cal are units of energy, and °C or K are temperature units.