Question

The number of molecules in 16.0g of oxygen gas is *

Answer 1

number of molecule = n×Na

n=16.0

Na =avagadro number

$6.023 \times {10}^{23}$

32 g or 1 mole of O2 = 6.023×10

${10}^{23}$

So, 16 g of O2 =

$6.023 \times {10}^{23} \times 1632$

=

$3.01 \times {10}^{23}$

molecules

.