Answer
See answer below.
Work Step by Step
The reaction is exothermic because the enthalpy change of reaction is negative.
$1.25\ g\div 30.00\ g/mol=0.0417\ mol\ NO$
From stoichiometry:
$0.0208\ mol\ O_2$
Enthalpy change:
$-114.1\ kJ/mol\times 0.0208\ mol=-2.38\ kJ$
