+H2O According to balanced equation, 1 mole of CaO reacts with 2 moles of HNO3 to give 1 mole of Ca(NO3)2. But the given amount of HNO3 is exactly half, i.e. 1∕2 mole. In this reaction, HNO3 act as a limiting reagent. As 126g ( 2 moles) of HNO3⟶164g(1mol) of Ca(NO3)2 So, 56g(1mol ) of HNO3⟶