Question

find out the final temperature of substance if the masses of water is 200gm and 120gm and it risen upto 60C and 90C​

Answer 1

Answer:

Heat energy given by metal piece =m⋅c⋅ΔT  

1

​

 

                                                         =20×0.3×(100−22)

                                                         =468J

Heat energy gained by water =m  

w

​

×c  

w

​

×ΔT  

2

​

 

                                                 =m  

w

​

×4.2×(22−20)

                                                 =m  

w

​

×8.4J

Heat energy gained by calorimeter =m  

c

​

×c  

c

​

×ΔT  

2

​

 

                                                          =50×0.42×(22−20)

                                                          =42J

By principle of calorimeter:

Heat lost = Heat gained

Heat energy given by metal = Heat energy gained by water + Heat energy gained by calorimeter

468=m  

w

​

×8.4+42

m  

w

​

=  

8.4

468−42

​

 

     =50.7g

Therefore, the mass f water used in the calorimeter is 50.7g.