A 50.0-mL sample of 0.90 M sodium hydroxide is quickly added to a calorimeter containing 50.0 mL of 0.90 M hydrochloric acid at

Question

A 50.0-mL sample of 0.90 M sodium hydroxide is quickly added to a calorimeter containing 50.0 mL of 0.90 M hydrochloric acid at 20.1°C. The equilibrium temperature of the reaction mixture is 26.7 °C. The reaction mixture weighs 99.85 g.
HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O
a. ΔT= _____ °C

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