contestada

How many kJ of heat do you need to raise the temperature of 400 g of ethanol from 20 °C to 60 °C?
Remember to convert your answer to kJ. Round your answer to two decimal places.

Please help

Respuesta :

CintiaSalazar

Taking into account the definition of calorimetry ans sensible heat, you need a heat of 38.72 kJ to raise the temperature of 400 g of ethanol from 20 °C to 60 °C.

What is calorimetry and sensible heat

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where

  • Q is the heat exchanged by a body of mass m.
  • c is the specific heat substance c.
  • ΔT is the temperature variation.

Amount of heat in this case

In this case, you know:

  • Q= ?
  • c= 2.42 [tex]\frac{J}{gC}[/tex]
  • m= 400 g
  • ΔT= Tfinal - Tinitial= 60 °C - 20 °C= 40 °C

Replacing in the definition of sensible hear:

Q = 2.42 [tex]\frac{J}{gC}[/tex]× 400 g× 40 °C

Solving:

Q= 38,720 J= 38.72 kJ

Finally, you need a heat of 38.72 kJ to raise the temperature of 400 g of ethanol from 20 °C to 60 °C.

Learn more about sensible heat:

https://brainly.com/question/13639835

brainly.com/question/14057615

brainly.com/question/24988785

brainly.com/question/21315372

brainly.com/question/13959344

#SPJ1