Question

Avogadro's number is the number of molecules present in 2.24L of any gas at stp ? is it true or false or none of these.​

Answer 1

Answer:

The statement, Avogadro's number is the number of molecules present in 2.24L of any gas at STP, is FALSE.

Explanation:

STP is the standard conditions of temperature (273K or 0°C or 32°F)  and pressure  (10⁵Pa or 1bar).  Avogadro's Number (6.022×10²³ )molecules are present in one mole of any substance. one mole of any gas occupies 22.4L at STP. So,   Avogadro's Number molecules occupy 22.4L at STP.

If a gas occupies 2.24L at STP, then

          moles of gas = 2.24 / 22.4 = 0.1mol.

    no: of molecules = moles × Avogadro's Number

⇒                              = 0.1×6.022×10²³ =6.022×10²²

hence, 2.24L of any gas contains $0.1N_A$ (6.022×10²² ) molecules at STP