The standard heats combustion of ethane is provided here below. What is the high

Question

The standard heats combustion of ethane is provided here below. What is the higher heating value (HHV) per mol of ethane? Given: Delta H _v (H_2O, 25 degree C)= 44.013 kJ/mol C_2H_6(g) + 7/2 O_2(g) rightarrow 2CO_2(g) + 3H_2O(v): Squareroot H degree_c = - 1428 kJ/mol Use Hess's law to calculate the standard heat of reaction for the following water gas shift reaction from the data given below CO(g) + H_2O(l) rightarrow CO_2(g) + H_2(g) Delta H degree_r = - 326.2 Btu/lbmol H_2O(l) rightarrow H_2O(v) Delta H_v = + 18, 935 Btu/lbmol

Explanation / Answer

hey hii,

im doing the second problem,

to calculate the standard heat of reaction of

C0(g) + H2O (v) >>>>>>> CO2 (g) + H2 (g)

the given data

CO(g) + H2O(l) >>>> CO2 (g) + H2   = -326.2 Btu/lb mol    (1)

H20(l) >>>> H2O v)                            = +18935 Btu/lbmol   (2)

to get the reaction we want we have to arrange the data.

C0 (g) + H2O (l) >>>>>> CO2 (g) + H2 (g)     = -326.2

H2O (v)   >>>>>>>>>>>>H2O (l)                     = -18935    reverse equation (2) so standard heat also reverses and gets negative sign

it gives CO +H2O >>>>>CO2 +H2 (-326.2 +(-18935)

= -19261.2 Btu/lbmol

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