Question

A 1.00-L insulated bottle is full of tea at 91.0°C. You pour out a mug of tea and immediately screw the stopper back on the bottle. Find the change in temperature of the tea remaining in the bottle that results from the admission of air at room temperature. (Let the room temperature be 20.0°C and assume that you poured out 225 cm³ of tea. Take the molar mass of air as 28.9 g/mol and ρ_air = 1.20  10^-3 g/cm³. Here we define a "monatomic ideal gas" to have molar specific heats  C_v= 3/2 R and C_p= 5/2 R, and a "diatomic ideal gas" to have C_v= 5/2R and C_p= 7/2R.

=________ degrees C

Answer 1

T = Tf

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