During lab, you learned about exothermic and endothermic heats of solution. Which compounds below could be used for a cold pack? (Select all that apply.)

a. LiCl (ΔHsolution = −37.0 kJ/mol)
b. KClO4 (ΔHsolution = +51.0 kJ/mol)
c. NaBrO3 (ΔHsolution = +26.9 kJ/mol)
d. NH4NO3 (ΔHsolution = +25.7 kJ/mol)
e. CaCl2 (ΔHsolution = −81.3 kJ/mol)
f. NaOH (ΔHsolution = −44.5 kJ/mol)