Respuesta :
Answer;
=9.83 × 10^20 molecules
Explanation;
Moles of C2H4 = 0.0458/ 28.05
Each mole contains 6.02 x 10^23 molecules
Therefore;
= 0.0458/ 28.05 = 0.001633 moles
but; 1 mole contains 6.02 x 10^23 molecules
Therefore;
= 0.001633 x 6.02 x 10^23 molecules
= 9.83 × 10^20 molecules
Answer: [tex]0.009\times 10^{23}[/tex] molecules.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
[tex]\text{Number of moles}=\frac{0.0458g}{28.05g/mol}=0.0016moles[/tex] (1g=1000mg)
Now 1 mole of [tex]C_2H_4[/tex] molecule contains = [tex]6.023\times 10^{23}[/tex] of molecules.
0.0016 moles of [tex]C_2H_4[/tex] molecule contains =[tex]\frac{6.023\times 10^{23}}{1}\times 0.0016=0.009\times 10^{23}[/tex] molecules.
