1) Calculate Delta Srxn for 2Mg( s )+O2( g )?2MgO( s ) (Please show work) 2) Fir
ID: 847951 • Letter: 1
Question
1) Calculate Delta Srxn for 2Mg(s)+O2(g)?2MgO(s) (Please show work)
2) Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light generation is an ATP-requiring reaction, firefly luciferase can be used to test for the presence of ATP. In this way, luciferase can test for the presence of life. The coupled reactions are
luciferin+O2ATP??oxyluciferin+lightAMP+PPi
If the overall ?G of the coupled reaction is -6.70kJ/mol , what is the equilibrium constant, K, of the first reactions at 278K? The ?G for the hydrolysis of ATP to AMP is ?31.6 kJ/mol.
3) At 25?C the reaction from Part A has a composition as shown in the table below.
Substance Pressure(atm) C2H2(g) 5.55 H2(g) 5.65 C2H6(g) 4.25
Explanation / Answer
1. Answer
2Mg(s)+O2(g)?2MgO(s)
delta So = (delta Ho - delta Go) / T
delta H0 = 2*deltaH0 f = 2 mol * ( - 602 ) = -1204 kj/mol
delta G0 = 2* delta G0 f = 2 mol * ( -569.6) = - 1139.2 kj / mol
delta S0 = [ -1204 - ( - 1139.2 ) ] / 298 = - 218.121 j/k-mol
2. Overall DeltaG = -6.40 kJ/mol
Delta G = 31.6 - 6.4 =25.2 KJ
T = 17 + 273.15 =290.15 K
Delta G = -RT * Ln (K)
25.2 * 10^3 J = -(8.314 J/moles*k)(290.15K) * Ln (K)
So (Delta G)/(-RT) = Ln (K)
Ln K = -10.44643114
Thus k = 2.905 *10^-5
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