Chemistry college Help

Question

How much heat (in kg) is required to raise the temperature of 1.75kg of ethanol from 25.0 degrees celsius to 75.0 degrees celsius? the specific heat of ethanol is 2.46 j/g K

Answer 1

q = m c ΔT

where q = heat absorbed or released = ?

m = mass = 1.75 kg x (1000 g / 1 kg) = 1750 g

ΔT = T_f - T_i = 75.0 - 25.0 = 50.0 ºC

Note! The unit for specific heat of ethanol is incorrect in your question. c = 2.46 J / gºC and NOT 2.46 J / gK.

q = 1750 g x 2.46 J / gºC x 50.0 ºC

= 215,250 J = 215 kJ (to 3 significant figures)

q is positive since heat is being added to raise the temperature from 25.0 to 75.0 ºC.