Question

How much heat is needed to heat 1kg of water at a temperature of 20˚c to 100˚c if the type of water is 1000j / kg˚c?

Answer 1

Answer: he required heat is 80,000 J or 80 KJ

Step-by-step explanation:

Known :

m = 1 kg

To = 20˚C

T1 = 100˚C

c water = 1000 J / kg˚C

Asked: How much heat is needed?

Settlement:

Remember! Heat Formula

Q = m. c. delta T

Heat needed

Q = m. c. delta T

Q = 1 kg. 1000 J / kg˚C. (T1 - To)

Q = 1000 J / ˚C. (100˚C - 20˚C)

Q = 1000 J / ˚C. 80˚C

Q = 80,000 J

Q = 80 KJ

So, the required heat is 80,000 J or 80 KJ

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Class = 7 Middle School

Chapter = Heat and Expansion  

Keywords = heat, heat type, mass, temperature