Is the following reaction feasible at 400K? Fe2O3 + 3C -> 2Fe + 3CO Enthalpy data: Fe2O3: -822 kJ/mol C: 0 kJ/mol Fe: 0 kJ/mol CO: -111 kJ/mol Entropy data: Fe2CO3: 90 J/K mol C: 6 J/K mol Fe: 27 J/K mol CO: 198 J/K mol A. No, it is not feasible because the Gibbs free energy change is positive. B. No, it is not feasible because the Gibbs free energy change is negative. C. Yes, it is feasible because the Gibbs free energy change is positive. D. Yes, it is feasible because the Gibbs free energy change is negative.

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.

1.solid

2.carbon dioxide

3.helium