The answer is B.) a star
did this help?
It means it is an ion. It has lost two protons making it a positive ion.
The energy can be shown as:
Q = ms dT
Whereas, m is the mass of block
s is specific heat
dT is change in temperature.
Copper block having the lowest specific heat and thus having the higher change in temperature and therefore having the higher final temperature.
Molality=mol/kg
342/171
=2m
Hope this helped :)