Three pure copper penies are handed to a young boy on a cold day (15°C) He holds his treasures in his hands as he walks home, warming them to his body temperature of 37°C How much heat did the pennies absorb?
(Each penny = 0.7521g)

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

answer///carbon;