Respuesta :
Explanation:
As molar mass of [tex]C_{2}H_{4}[/tex] is 28.05 g/mol and it is given that its mass is 2.8 g.
Therefore, calculate its number of moles as follows.
No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]
= [tex]\frac{2.8 g}{28.05 g/mol}[/tex]
= 0.099 mol
= 0. 1 mol (approx)
And, according to the mole concept there are [tex]6.022 \times 10^{23} atoms[/tex] present in 1 mole of a substance.
Mathematically, 1 mole = [tex]6.022 \times 10^{23}[/tex] atoms or molecules
Therefore, calculate the number of carbon atoms present in 0.1 mol of [tex]C_{2}H_{4}[/tex] as follows.
[tex]2 \times 0.1 mol \times 6.022 \times 10^{23}}atoms /mol[/tex]
= [tex]1.204 \times 10^{23}[/tex] atoms
Thus, we can conclude that there are [tex]1.204 \times 10^{23}[/tex] atoms of carbon atoms present in 0.1 mol of [tex]C_{2}H_{4}[/tex].
[tex]\rm \bold { 1.204 \times 10^2^3}[/tex] carbon atoms are contained in 2.8 g of [tex]\rm \bold_{C_2H_4}[/tex].
Given here,
2.8g [tex]\rm \bold_{C_2H_4}[/tex]
As we know,
Molar mass [tex]\rm \bold_{C_2H_4}[/tex] = 28.05 g/mol
Number of moles = [tex]\rm \bold { \frac{Mass}{Molar Mass} }[/tex]
Number of moles = [tex]\rm \bold{ \frac{ 2.8}{28.05}}[/tex]
Number of moles = 0.1 moles
Since, in 1 molecule of [tex]\rm \bold_{C_2H_4}[/tex] contains 2 Carbon atoms.
Number of moles of carbon = [tex]\rm \bold {2\times 0.1 = 0.2 mole}[/tex]
Number of Carbon atoms = [tex]\rm \bold { 0.2 \times 6.2 \times 10^2^3 = 1.204 \times 10^2^3}[/tex]
Hence we can conclude that [tex]\rm \bold { 1.204 \times 10^2^3}[/tex] carbon atoms are contained in 2.8 g of [tex]\rm \bold_{C_2H_4}[/tex].
To know more about mole concept, refer to the link:
https://brainly.com/question/20486415
