If 2.3 mol of a gas occupies 50.5 ml how many moles of the gas will occupy 85.5 ml at the same temperature and pressure?

The number of moles of gas is 3.89 moles.

Explanation:

To calculate the number of moles for given volume, we use the equation given by Avogadro's Law.

This law states that volume is directly proportional to the number of moles of the gas at constant pressure and temperature.

  (At constant temperature and pressure)

Or,

where,

are initial volume and number of moles

are final volume and number of moles

We are given:

Putting values in above equation, we get:

Hence, the number of moles of a gas is 3.89 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