All categories

3 years ago

17. Which of the following is NOT an empirical formula? *

Chemistry

2 answers:

antiseptic1488 [7]3 years ago

6 0

Answer:

17. C_2 H_6 is not an empirical formula.

18. option A - The molecular formula can be a simple whole number multiple of the empirical formula.

Explanation:

17. C_2 H_6 is not an empirical formula. it is molecular formula of ethane.

Empirical formula of C_2 H_6 is CH_3

18. option A - The molecular formula can be a simple whole number multiple of the empirical formula.

If molecular formula can not be reduced to further than molecular formula to empirical formula.

Molecular formulas tell about number of atoms that each element has in a compound while empirical formulas tell about smallest proportion of elements in given compound

Aloiza [94]3 years ago

3 0

Answer: 17) d. $C_2H_6$

18. c. The empirical formula of a compound can be twice the molecular formula.

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.

To calculate the molecular formula, we need to find the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is:

$n=\frac{\text{molecular mass}}{\text{empirical mass}}$

The empirical mass can be calculated from empirical formula and molar mass must be known.

17. Thus the empirical formula of $C_2H_6$ should be $CH_3$

18. The molecular formula will either be same as empirical formula or is a whole number multiple of empirical formula. Thus the empirical formula of a compound can never be twice the molecular formula.

You might be interested in

If the volume occupied by the gas molecules shown below were doubled, what would happen to the pressure they exert? (Assume cons

AnnZ [28]

there's no picture here but I guess the answer would be:

considering the constant temperature, if you double the volume, the pressure would be halved.

like: volume is 2, pressure is 4

if 2×2, then:4÷2

3 0

3 years ago

Why are most solid ionic compounds electrically nonconductive, whereas aqueous solutions of ionic compounds are good conductors

Allisa [31]

Answer:

there must be free-moving electrons in a compound to conduct electricity.

in solid ionic compounds, there are no free electrons so it can't conduct electricity.

But in aqueous form the forces of attraction are broken and the ions (cations and anions) are free to move. This means there are free electrons that allow the aqueous compound to conduct electricity.

8 0

3 years ago

How many moles of oxygen will occupy a volume of 2.50 liters?

loris [4]

Data:
n (number of mols) = ?
V (volume) = 2.50 Liters
If:
1 L → 1000 g
2.50 L → y

y = 1000*2.50 = 2500 g

Therefore:
m (mass) = 2500 g

Now:
Molar Mass (MM) of oxygen = 16 g/mol

Formula:
$n = \frac{m}{MM}$

Solving:
$n = \frac{m}{MM}$
$n = \frac{2500\:\diagup\!\!\!\!\!g}{16\:\diagup\!\!\!\!\!g/mol}$
$\boxed{\boxed{n = 156.25\:mols}}\end{array}}\qquad\quad\checkmark$

7 0

3 years ago

Im in the middle of a chem test and i literally have no clue what is happening

denis23 [38]

Answer:

No question so I'm just taking the points

5 0

3 years ago

Which of the following is a primary cause of LO/TO accidents?

Marianna [84]

<h2>Answer:</h2>

The correct answer is

A) Regular operation

<h2>Explanation:</h2>

Even those workplaces that have established LO/TO processes face challenges, including: Lack of specific procedures written for each piece of equipment identifying all energy sources and energy isolation devices. Lack of comprehensive safety training for everyone in the workplace. Incorrect tag use.

So, regular operation is the primary cause of LO/TO accidents.

3 0

3 years ago

Read 2 more answers