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erica [24]
3 years ago
11

How many joules of energy are needed to change the temperature of 75.0 g of water 250C?

Chemistry
1 answer:
Phoenix [80]3 years ago
7 0
Answer:

17000 joules

Explanation:

With knowledge of the specific heat capacity of a substance, its mass, and the temperature change, we can convert this to the energy required for this temperature change using:

<span>ΔH=mCΔT</span>, where

<span>ΔH=</span>change in enthalpy (J)

<span>m=</span> mass of substance being heated (g) i.e. water in this question

<span>C=</span> specific heat capacity (J/g°C)

<span>ΔT=</span> change in temperature (°C)

We know mass<span>=65g</span> and <span>ΔT=76°C−12°C=64°C</span>

The specific heat capacity of water is 4.18J/g°C

Therefore, <span>ΔH=65g⋅<span><span>4.18J</span><span>g°C</span></span>⋅64<span>°C</span></span>

<span>=17388.8J</span>

<span>=17000J</span> (2 significant figures)

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