Question

Quantas moléculas existem em 0.25kg de dióxido de carbono( CO2)?​

Answer 1

$0,25kg=0,25\times{10}^{3}g$

$m_{CO_{2}}=12+2.16=12+32=44g/mol$

$\mathsf{44g\rightarrow\,6,0\times{10}^{23}}\\\mathsf{0,25\times{10}^{3}\rightarrow\,x}$

$\mathsf{x=\dfrac{0,25\times{10}^{3}\times6\times{10}^{23}}{44}}$

$\boxed{\boxed{\mathsf{x=3\times{10}^{24}moléculas}}}$