Enthalpy Change?

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Given the thermochemical equation SO2(g) + ½ O2(g) ® SO3 (g) DH = -99.1 kJ
calculate the enthalpy change (DH) when 89.6 g of SO2 is converted to SO3

a. -69.3 kJ
b. -139 kJ
c. 69.3 kJ
d. 139 kJ
e. -111 kJ

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