Alchemy contributed to the development of chemistry. True or False?

An unknown compound with a molar mass of 223.94 g/mol consists of 32.18% c, 4.50% h, and 63.32% cl. find the molecular formula f

Dima020 [189]

The actual number of atoms of each element present in the molecule of the compound is represented by the formula known as molecular formula.

Molar mass of the unknown compound = 223.94 g/mol (given)

Mass of each element present in the unknown compound is determined as:

Mass of carbon, $C$ :

$\frac{32.18}{100}\times 223.94 = 72.06 g$

Mass of hydrogen, $H$ :

$\frac{4.5}{100}\times 223.94 = 10.08 g$

Mass of chlorine, $Cl$ :

$\frac{63.32}{100}\times 223.94 = 141.79 g$

Now, the number of each element in the unknown compound is determined by the formula:

$number of moles = \frac{given mass}{molar mass}$

Number of moles of $C$ :

$number of moles = \frac{72.06}{12} = 6.005 mole\simeq 6 mole$

Number of moles of $H$ :

$number of moles = \frac{10.08}{1} = 10.08 mole\simeq 10 mole$

Number of moles of $Cl$

$number of moles = \frac{141.79}{35.5} = 3.99 mole\simeq 4 mole$

Dividing each mole with the smallest number of mole, to determine the empirical formula:

$C_{\frac{6}{4}}H_{\frac{10}{4}}Cl_{\frac{10}{4}}$

$C_{1.5}H_{2.5}Cl_{1}$

Multiplying with 2 to convert the numbers in formula into a whole number:

So, the empirical formula is $C_{3}H_{5}Cl_{2}$ .

Empirical mass = $12\times 3+1\times 5+2\times 35.5 = 112 g/mol$

In order to determine the molecular formula:

n = $\frac{molar mass}{empirical mass}$

n = $\frac{223.94}{112} = 1.99 \simeq 2$

So, the molecular formula is:

$2\times C_{3}H_{5}Cl_{2} = C_{6}H_{10}Cl_{4}$

6 0

3 years ago

Water has a density of 1.0g/ml * Physical Property Physical Change Chemical Property Chemical Change

Daniel [21]

The density of water is a physical property.

You can measure it without changing the water to a different substance.

It is not a physical change because the water does not change to ice or steam.

You can observe a chemical property or a chemical change only if the water changes to a different substance.

5 0

3 years ago

What will result from the Alpha decay of (17 8)O?

Nookie1986 [14]

Answer:

alpha decay, because alpha particles have two protons and two neutrons. If the isotope has an atomic number two less than the original, it lost two protons, the same amount as in an alpha particle.

Explanation:

3 0

3 years ago

What is the potential energy of a 2-kg vase sitting on a table with a height of 1 meter?

lisov135 [29]

"20 J" is the "Potential Energy" of "vase" on the table.

Explanation:

The body possess some energy according to the position of the object that is the when an object is placed at a height it stores some energy it is called "Potential Energy".

Formula used to calculate the "Potential Energy" is $m\times g \times h$

Where, "m" is mass of vase is given that 2 kg, "g" is acceleration due to gravity is $10 m/s^2$ and "h" is height of the object where it placed is 1 m.

Substitute the given values in the formula,

Potential energy of the vase = $2\times10\times1$

Potential energy of the vase = 20 J

7 0

3 years ago

How many gallons in 1.3 liter for gas tank?

Veseljchak [2.6K]

0.34342367

hopes this helps,

Xeno

6 0

3 years ago