Question

A liquid has a mass of 18.39g. If 655j of heat are required to change the temperature from 32.8 degrees to 18.2 degrees what is the identity of the liquid

Answer 1

Answer:

Ethanol

Explanation:

To know the identity of the liquid, first we must obtain the specific heat capacity of the liquid. This can be obtained as follow:

Step 1:

Data obtained from the question. This includes:

Mass (M) = 18.39g = 18.39/1000 = 0.01839Kg

Heat (Q) = 655 J

Initial temperature (T1) = 32.8°C

Final temperature (T2) = 18.2°C

Change in temperature (ΔT) = T1 – T2 = 32.8°C – 18.2°C = 14.6°C

Specific heat capacity (C) =?

Step 2:

Determination of the specific heat capacity of the liquid. This is illustrated below:

Q = MCΔT

C = Q/MΔT

C = 655 / (0.01839 x 14.6)

C = 2440 J/Kg°C

Comparing the specific heat capacity obtained with the standard given in the table, the liquid is Ethanol