How many moles of ZnCl2 will be produced from 21.0g of Zn assuming CuCl2 is available in excess

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Given the following information: mass of proton = 1.00728 amu mass of neutron = 1.00866 amu mass of electron = 5.486 × 10^-4 amu speed of light = 2.9979 × 10^8 m/s calculate the nuclear binding energy (absolute value) of 3li^6. which has an atomic mass of 6.015126 amu. j/mol.

Why is the melting of ice a physical change ?