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If 1.5g of CaO is mixed with 2.5M HNO3

how many moles of CaO were reacted and what type of reaction is this ?

2 answers

How much 2.5M HNO3.
CaO + 2HNO3 => Ca(NO3)2 + H2O

This is an acid/base reaction but in terms of the several types I think you are looking for double displacement.
1.5g/56.1 = 0.0268
And its neutralisation reaction