Explain what account for differences in specific heat capacity and molar heat capacity of these objects?

Question

Specific heat capacity of chalk= 3543 J * kg/K
molar heat capacity of chalk = 105.6 J * moles/K
Specific heat capacity of big metal ball = 356.8 J * kg/K
molar heat capacity of big metal ball = 110.6 J * moles/K
Specific heat capacity of marble= 4435 J * kg/K
molar heat capacity of marble = 68.8 J * moles/K

Answer 1

Metals have lots of free electrons (very light objects that can easily carry kinetic energy), so they have low specific heats.

Chalk and marble do not.

Molar heat capacity is misleading because chalk and marble come in mollecules that are bigger than a typical atom of metal. Consequently, this depresses the molar heat capacity of chalk and marble, so you aren't really comparing apples to apples.

Answer 2

The difference between specific heat capacity and molar heat capacity is due to the mass difference between a Kg and a mole. Avogadro's number is the number of molecules/atoms in a mole. Na = 6.022 10^{23} per mole so the number of Kg per mole = molecular weight x Na.
Note the molar heat capacity of all three is similar

Answer 3

I try to answer at only one question about i am sure

The heat capacity of the metal ball is always lower than the other products since the metals conducts better the heat due to greter mobility in electrons

Answer 4

RE: Calculating Specific heat capacity? I know the equation and everything(q*m*change in temperature*C) But im kinda confused on one problem of my worksheet. This time they give me in the problem (2000 J=Q, 10 C=change in temp, m=1kg) THere asking me to find the specific heat and i cant really figure it out