How much heat in joules is needed to raise the temperature of8.5 L of water from

Question

How much heat in joules is needed to raise the temperature of8.5 L of water from 0C to 74.0 C( hint recall the originaldefinition of the liter) _____J Equal amounts of heat are added to equal masses of iron andsilver at the same initial temperature. Which metal will have the higher finaltemperature?______ How many times greater will that temperature chang be than thetemperature change of the other metal? ____times greater How much heat in joules is needed to raise the temperature of8.5 L of water from 0C to 74.0 C( hint recall the originaldefinition of the liter) _____J Equal amounts of heat are added to equal masses of iron andsilver at the same initial temperature. Which metal will have the higher finaltemperature?______ How many times greater will that temperature chang be than thetemperature change of the other metal? ____times greater

Explanation / Answer

Initial temp t= 0oC

Final temp t ‘ = 74 oC

Volume of water V = 8.5 L

                               = 8.5 * 10 ^ -3 m^ 3

Mass of water M = V * 1000 kg / m^ 3

                            = 8.5 kg

Heat needed Q = MC ( t’ –t )

Where C = specific heat of water = 4186 J / kg oC

Plug thevalues weget Q = 2.632 * 10 ^ 6 J

(b).specifc heat of iron C ‘ =0.46 kJ / kgoC

Specific heat of silver C “ = 0.23 kJ / kgoC

C ‘ > C “

Therefore silverhave higher final temperature

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