Use bond energies to calculate the heat of a reaction: C-N 305 kJ/mol
C-O 358 kJ/mol
C=O 745 kJ/mol
C=O(in CO2) 799 kJ/mol
O-H 467 kJ/mol
N-H 391 kJ/mol
Anyone can help please?

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.

b.false that your answer