Question

45g KCl at 60°C
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70g of CaCl2 at 10°C
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20g of NaCl at 50°C
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Answer 1

Do you want me to compute the final equilibrium temperature when those three samples are mixed (adiabatically), or something else (heat released/absorbed, average temperature, etc.)?

If you want the final temperature, I need to confirm a few assumptions or get extra info:
- Are these solids being mixed in an insulated container with no phase changes (no melting or dissolving)?
- Should I treat them as anhydrous solids? (CaCl2 is often hydrated and dissolving CaCl2 in water is strongly exothermic — that changes things a lot.)
- Do you want me to use typical specific heat (Cp) values for the solids, or do you have measured Cp values to use?

If you confirm adiabatic mixing of anhydrous solids and allow me to use typical Cp values, I can compute Tf from:
sum_i m_i·c_i·(T_i − Tf) = 0 → Tf = (Σ m_i·c_i·T_i) / (Σ m_i·c_i).

Tell me which assumptions you want and I’ll do the calculation.