Astudent weighs out 3.23 g of fe(no3)3 • ? h2o and heats it. the remaining anhydrous salt has a mass of 1.93 g. calculate the empirical formula for the hydrate.

The empirical formula is :

Explanation:

Let us assume the moles of hydration in ferric nitrate is ''

Thus the formula of the compound becomes :

Now when its heated , the reaction proceeds like  :

⇒

Given ,

Molar mass of respectively.

The mass of 1 mol of

The number of moles =

Therefore the number of hydrated moles must also be 0.008

Given ,

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

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .