A100 g piece of aluminum is heated to 90°c. it is then dropped into water to bring its temperature down to 20°c. the heat transferred to water is 6300 j. what is the specific heat capacity of aluminum?

c = 0.9 j/g. °C

Explanation:

Given data:

Mass of aluminium = 100 g

Initial temperature = 90 °C

Final temperature = 20°C

Heat transfer = 6300 J

Specific heat of aluminium = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

The Q will negative because metal release the heat.

c = Q / m. ΔT

ΔT  = t2 - t1

ΔT  = 20°C - 90 °C

ΔT  = -70 °C

c = -6300 j/ 100 g.-70°C

c = -6300 j/ -7000 g.°C

c = 0.9 j/g. °C

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8