Question

Emily makes 0.250 kg of hot tea at 99.0°C. How much ice at 0.00°C must she add to the tea so that the mixture reaches a final temp. of 8.00°C? (You may treat the tea as if its water.)

My work:
(0.25)(4186)(91) + m(4186)(-8)(3.35 ×10^5)=0

My answer: 0.316

It says Im wrong...what did i do wrong?

Answer 1

I got same thing idk

Answer 2

the correct answer is 0.258. you have to do the multiplication for the latent heat of fusion and the Q=mc∆T equations separately and then add the two together because those are your x-values, or your unknowns (the mass in kg). Next, you take the sum of those equations and you divide it by the
Q=mc∆T answer you got with the warm water.