Question

the gas having same number of molecules as 15 gram of oxygen is . . a bit urgent

Answer 1

1g of H2 have same number of molecules as 16 gram of oxygen

Answer 2

To find:

The gas having same number of molecules as 16 gm of O2.

• 16 gm O3

• 16 gm SO3

• 48 gm SO3

• 1 gm H2

Calculation:

General formula for number of molecules

$\boxed{\boxed{\sf{= \dfrac{given\: mass}{molar \:mass} \times Avagadro\: No.}}}$

Number of molecules in 16 gm O2:

$= \dfrac{16}{32} \times N_{A}$

$= \dfrac{1}{2} \times N_{A}$

Number of molecules in 16 gm O3:

$= \dfrac{16}{48} \times N_{A}$

$= \dfrac{1}{3} \times N_{A}$

Number of molecules in 16 gm of SO3:

$= \dfrac{16}{80} \times N_{A}$

$= \dfrac{1}{5} \times N_{A}$

Number of molecules in 48 gm of SO3:

$= \dfrac{48}{80} \times N_{A}$

$= \dfrac{3}{5} \times N_{A}$

Number of molecules in 1 gm H2:

$= \dfrac{1}{2} \times N_{A}$

So, 1 gm H2 has same number of molecules as that of 16 gm O2.