Chemistry, 12.07.2019 21:00 tessalopezgarcia2345

The empirical formula of a chemical substance is ch2. the molar mass of a molecule of the substance is 56.108 g/mol. what is the molecular formula of the chemical substance? a: c2h4 b: c4h8 c: c3h4 d: c6h6

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Answer from: vanenav2003ovf1lz

- Molecular formula of the compound is C_4H_8 .

Solution:- A molecular formula has n number of empirical formula units, where n is a whole number integer like 1,2,3 and so on.

Molar mass = n(empirical formula mass)

Empirical formula mass = 12.01+2(1.01)

= 12.01+2.02

= 14.03

Molar mass is given as 56.108. Let's plug in the values and calculate the value of n:

56.108 = n(14.03)

$n=\frac{56.108}{14.03}$

n = 4

Value of n is 4 means there are four empirical formula units involved to make the molecular formula of the compound.

So, the molecular formula of the compound is C_4H_8 .

Answer from: Quest

answer; ///i do believe that the correct answer is (b); ///particle composed of two or more atoms bonded together;

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

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The empirical formula of a chemical substance is ch2. the molar mass of a molecule of the substance...

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