Question

find the no.of moles of oxygen molecules present in 56 grams of o2​

Answer 1

Explanation:

molucular mass of oxygen=16

in 16 g. oxygen=NA number of molecule

$\boxed{ NA=6.022×10^-23 }$

so,in 8 g. oxygen =NA/2 numbers of molecule

in 56 g. oxygen=3×16+8 number of mulecule

so. 56 g.s=3×NA+NA/2 g. numbers of molecule

56 g. oxygen=7NA/2=42.154/2=21.077

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Answer 2

Explanation:

molucular mass of oxygen=16

in 16 gm oxygen= NA number of molecule

$\boxed{\underline{\mathfrak{\red{   </strong><strong>NA</strong><strong>=</strong><strong>6</strong><strong>.</strong><strong>0</strong><strong>2</strong><strong>2</strong><strong>×</strong><strong>1</strong><strong>0</strong><strong>^</strong><strong>2</strong><strong>3</strong><strong>}  }    }  }$

so,in 8 g. oxygen =NA/2 numbers of molecule

in 56 g. oxygen=3×16+8 number of muleculeso.

56 g.s=3×NA+NA/2 g. numbers of molecule

56 g. oxygen=7NA/2=42.154/2=21.077