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Masja [62]
3 years ago
13

How many carbon atoms are contained in 2.8 g of c2h4 ?

Chemistry
2 answers:
MrRa [10]3 years ago
8 0

Answer:

The answer to your question is:  1.205 x 10²³ atoms of Carbon

Explanation:

Data

Carbons atoms contained in 2.8 g C₂ H₄

MW C₂ H₄ = (12 x 2) + (4 x 1) = 24 + 4 = 28 g

                         28 g of C₂ H₄ ----------------  24 g of carbon

                         2.8 g C₂ H₄   -----------------    x

                         x = (2.8)(24) / (28)

                            = 2.4 grams of C

                             1 mol  -------------------   12 g of Carbon

                             x        -------------------    2.4 g

                            x = (2.4x 1) / 12 = 0.2 mol

                             1 mol -----------------   6.023 x 10 ²³ atoms

                           0.2 mol  --------------     x

                            x = (0.2 x 6.023 x 10 ²³) / 1

                              = 1.205 x 10²³ atoms

kodGreya [7K]3 years ago
8 0

Explanation:

As molar mass of C_{2}H_{4} 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 = \frac{mass}{\text{molar mass}}

                                    = \frac{2.8 g}{28.05 g/mol}

                                    = 0.099 mol

                                    = 0. 1 mol (approx)

And, according to the mole concept there are 6.022 \times 10^{23} atoms present in 1 mole of a substance.

Mathematically,    1 mole = 6.022 \times 10^{23} atoms or molecules

Therefore, calculate the number of carbon atoms present in 0.1 mol of C_{2}H_{4} as follows.

              2 \times 0.1 mol \times 6.022 \times 10^{23}}atoms /mol

                 = 1.204 \times 10^{23} atoms

Thus, we can conclude that there are 1.204 \times 10^{23} atoms of carbon atoms present in 0.1 mol of C_{2}H_{4}.

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Dafna11 [192]

Answer:

c and d are correct

Explanation:

In A, false because in Valence Electrons, the more the valences, the more stable an atom is.

In B, false because atoms cannot readily gain or lose valence electrons as the number of valence electrons is determined by the column they are in.

In C, true because the more the valence electrons, the more the stability of an atom.  

In D, true as electron placing is important and the reactivity of an atom is important.

So C and D are true!

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