How much heat is emitted when 65.4 g of isopropyl alcohol condenses at 25 ∘C? The heat of vaporization of isopropyl alcohol at 25 ∘C is 45.4 kJ/mol.

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.

it's c. elements are placed in rows based on how may valencies electrons have.