How many molecules are contained in 127 grams of iodine?

Answer : The number of molecules contained in 127 grams of iodine are,

Solution : Given,

Mass of iodine = 127 g

Molar mass of iodine = 126.9 g/mole

First we have to calculate the moles of iodine.

Now we have to calculate the number of molecules of iodine.

As, 1 mole of iodine contains number of molecules of iodine

So, 0.99 mole of iodine contains number of molecules of iodine

Therefore, the number of molecules contained in 127 grams of iodine are,

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