Question

Dimethyl ether, a useful organic solvent, is prepared in two steps. In the first step, carbon dioxide and hydrogen react to form methanol and water:

CO2
(g) 
+
 
3H2
(g) 
 
CH3OH
(l) 
+
 
H2O
(l)
 
=ΔH−131.kJ

In the second step, methanol reacts to form dimethyl ether and water:

2CH3OH
(l) 
 
CH3OCH3
(g) 
+
 
H2O
(l)
 
=ΔH8.kJ

Calculate the net change in enthalpy for the formation of one mole of dimethyl ether from carbon dioxide and hydrogen from these reactions.
Round your answer to the nearest kJ

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