Question

Se tienen 500g de alcohol etílico a una temperatura de -40 °C ¿Cuánto calor se necesita para transformarlo a vapor a una temperatura de 150ºC?

Answer 1

The question is: You have 500g of ethyl alcohol at a temperature of -40 ° C. How much heat is needed to transform it into steam at a temperature of 150ºC?

Answer: 233700 J heat is needed to transform ethyl alcohol into steam at a temperature of
`-40^(o)C` to
`150^(o)C`.

Step-by-step explanation:

Given: Mass = 500 g

Initial temperature =
`-40^(o)C`

Final temperature =
`150^(o)C`

The standard value of specific heat of ethyl alcohol is
`2.46 J/g ^(o)C`.

Formula used to calculate the heat energy is as follows.

`q = m * C * (T_(2) - T_(1))`

where,

q = heat energy

m = mass of substance

C = specific heat

`T_(1)` = initial temperature

`T_(2)` = final temperature

Substitute the values into above formula as follows.

`q = m * C * (T_(2) - T_(1))\\= 500 g * 2.46 J/g^(o)C * [150 - (-40)]^(o)C\\= 233700 J`

Thus, we can conclude that 233700 J heat is needed to transform ethyl alcohol into steam at a temperature of
`-40^(o)C` to
`150^(o)C`.