Whenever energy is converted from one form to another, some of that energy is lost by being changed into heat.
In a crystal, the molecules are closer together as they are in any solid. they have less room to move, and might even be combined together rather than individual
Molar mass Pb = 207.2 g/mol
1 mole Pb ------------- 207.2
? mole Pb ------------ 9.51 x 10³
moles = 9.51 x 10³ * 1 / 207.2
moles = 9.51 x 10³ / 207.2
= 45.89 moles
hope this helps!
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