1) 75 g of water at 10 °C is heated by supplying 25200 J of heat energy. Calculate the final temperature of water. [Specific heat capacity of water = 4200 J/kg °C]
2) A solid of specific heat capacity 2.1 J/kg °C at 100 °C is dropped into 400 g of water at 25 °C. If the final temperature is 40 °C, find the mass of the solid.

1

Answers

The Brainliest Answer!
2015-06-10T21:51:10+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Heat absorbed = ΔH = m s ΔT
     25, 200 J = (75/1000) kg * 4, 200 J/kg/⁰C  * ΔT
   =>  ΔT =  80 ⁰C
So final temperature is : 10⁰C + 80⁰C = 90 ⁰C

==============================

 mass of solid = m kg
   Heat energy given out by stone  =  heat absorbed by water
   m * 2.1 J/kg/⁰C * (100 ⁰C - 40 ⁰C)  =  0.4 kg * 1000 J/kg/⁰C * (40 ⁰C - 25⁰C)
       m = 400 * 15 / (2.1 * 60)  =  47.619 kg

If the specific heat capacity of the stone is 2.1 kJ/kg/⁰C then the mass of the solid  is :  47.619 grams

2 5 2
click on thanks button above please