How many moles are equal to 89.23g of calcium oxide?

mass of calcium oxide equals 89.23 g

molar mass of calcium oxide equals 56 G / Mole

the formula which is used as much of CaO equals molar mass of CaO

now put all of the Given values in this formula, we would get the moles of calcium oxide.

moles of CaO= 88.23g over 56g/mole which would get you 1.593 moles

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance