After transfer of 1.50 kj of thermal energy to a 0.663-kg block of copper the temperature is 47.8 °c. the specific heat capacity of copper is 0.385 j g-1 °c-1.
calculate the initial temperature of the copper.
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The initial temperature of the copper was 41.9 °C

Explanation:

Data:

Heat transferred, Q = 1.5 kJ = 1500 J

Mass of copper, m = 0.663 kg = 663 g

Final temperature, T2 = 47.8 °C

Specific heat capacity of copper, cp = 0.385 J/(g °C)

Initial temperature, T1 = ? °C

The heat transferred is computed as follows:

Q = m*cp*(T2 - T1)

Isolating T1:

T1 = T2 - Q/(m*cp)

Replacing with data (units are omitted):

T1 = 47.8 - 1500/(663*0.385)

T1 = 41.9 °C

the answer for sodium is 0.186

the answer for rubidium is 0.251