All categories

3 years ago

A compound of carbon and hydrogen contains 92.3 percent c and has a molar mass of 78.1g/mol. What is its molecular

Chemistry

1 answer:

alekssr [168]3 years ago

7 0

Answer:

C₆H₆

Explanation:

We need to find the molecular formula of a compound of carbon (C) and hydrogen (H), so what we need to find out is the number of atoms of C and of H in the molecule. We know:

molar mass = 78.1 g/mol
C% = 92.3% = 92.3 g C / 100 g compound

So, in 1 mol of compound, 92.3% of the mass corresponds to Carbon:

mass of C / mol of compound = molar mass × C% = 78.1 g/mol × 92.3/100 = 72.1 g/mol

moles of C = mass C / molar mass C = 72.1 g / 12.011 g/mol

moles of C = 6 moles of C per mol of compound

If 72.1 g in a mol of compound are Carbon atoms, the difference between the molar mass and the mass of Carbon atoms will correspond to H atoms in 1 mol of compound:

mass of H / mol of compound = molar mass - mass of C/mol

mass of H = 78.1 g / mol - 72.1 g /mol = 6.0 g/mol of compound

moles of H = mass H / molar mass H = 6.0 g / 1.008 g/mol

moles of H = 6.0 moles of H per mol of compound

So one mol of compound has 6 moles of C and 6 moles of H.

The molecular formula is then written as C₆H₆

You might be interested in

The temperature in Jersey City, NJ in mid-Spring is 60*F. The temperature in Miami, FL is 90*F on the same day. Miami is about 1

timurjin [86]

Answer:

Temperature gradient = 30

90F - 60F = 30F

The temperature gradient is 30F.

If I am right, let me know.

7 0

2 years ago

Read 2 more answers

How many moles of aluminum oxide would form if 12.5 moles of aluminum burned

jarptica [38.1K]

Balance it:

So you need 2 Al and 3 O2 to make 2 Al2O3 (aluminum oxide).

I'm going to assume you have all the O2 you need.

Since 2 mols of Al is needed to make 2 mols of the product, it's a 1:1 ratio. You get as much aluminum oxide for as much aluminum you burn.

So 12.5 mols if there is not a lack of the O2.

7 0

3 years ago

___Fe + ___O2 →___Fe2O3 Your old bike left out in the rain starts to rust. What coefficients fill in the blanks to balance the e

Diano4ka-milaya [45]

D) 4Fe + 3O2 -> 2Fe3O3

4 0

3 years ago

Read 2 more answers

What happens to frequency as wavelength

castortr0y [4]

Answer:

B. Frequency decreases

4 0

3 years ago

Question 2: Naming Hydrocarbons

oksian1 [2.3K]

Answer:

1) 1-Pentyne

2) But-2-yne

3) Ethyne

4) 1-Propyne

5) 1-Butyne

6) Pent-2-yne

Explanation:

1) The number of carbon on the longest chain = 5, (two carbon atoms between the triple bond) therefore the prefix is pen-

The functional group is the triple bond on the first carbon with the suffix -yne

The name of the compound is 1-Pentyne

2) There are 4 carbon atoms on the longest chain, therefore, the prefix is but-

The location of the triple bond functional group (suffix; -yne) is on the second carbon atom

Therefore, the name of the compound is But-2-yne

3) The triple bond functional group is between the only two carbon atoms, therefore, the name is Ethyne

4) The number of carbon atoms = 3, with a prefix prop-, and the functional group on the first carbon atom on the longest chain is the triple bond, with suffix -yne

Therefore, the name of the compound is 1-Propyne

5) The number of carbon atoms on the longest chain = 4, the prefix is but-

The location of the triple bond functional group (suffix -yne) is on the first carbon atom

Therefore, the name is 1-Butyne

6) The number of carbon atoms on the longest chain = 5, the prefix of the compound is pen-

The location of the triple bond functional group (suffix; -yne) is on the second carbon atom, therefore;

The name of the compound is Pent-2-yne

4 0

3 years ago