Question

20g of water at 30°C was mixed with 40g of water at 75°C. What is

the final temperature of the mixture? (specific heat capacity of water
is 4.184 J/g°C).​

Answer 1

The temperature of the mixture is 60°C

Step-by-step explanation:

We can write the energy of water as follows:

E = m×C×T

Where E is energy in Joules, m is mass of water, C is specific heat of water = 4.184J/g°C and T is temperature

Replacing fot both samples:

E = 20g×4.184J/g°C×30°C

E = 2510.4J

E = 40g×4.184J/g°C×75°C

E = 12552J

The total energy of the mixture is 12552J + 2510.4J = 15062.4J

Mass = 60g:

15062.4J = 60g×4.184J/g°C×T

60°C = T

The temperature of the mixture is 60°C