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2 years ago

How many kJ of heat do you need to raise the temperature of 400 g of ethanol from 20 °C to 60 °C?

1 answer:

5 0

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.

<h3>What is calorimetry and sensible heat</h3>

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.

<h3>Amount of heat in this case</h3>

In this case, you know:

Q= ?
c= 2.42 $\frac{J}{gC}$
m= 400 g
ΔT= Tfinal - Tinitial= 60 °C - 20 °C= 40 °C

Replacing in the definition of sensible hear:

Q = 2.42 $\frac{J}{gC}$ × 400 g× 40 °C

Solving:

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:

brainly.com/question/13639835

brainly.com/question/14057615

brainly.com/question/24988785

brainly.com/question/21315372

brainly.com/question/13959344

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