Question

An organic compound was found to contain 10% hydrogen and 90% carbon by mass. Find its empirical formula​

Answer 1

Ответ:

Let's take 100 g of this compound;

Quantity of hydrogen (mol) = (100*0.1)/1 = 10,

Quantity of carbon (mol) = (100*0.9)/12 = 7.5,

simple formula - C7.5H10->multiply by 10, so empirical formula is C75H100.

Answer 2

To find the empirical formula of the organic compound, we need to determine the ratio of atoms of each element in the compound. In this case, we know that the compound contains 10% hydrogen and 90% carbon by mass.

1. First, assume that you have 100 grams of the compound. This means that 10% of 100 grams is hydrogen, and 90% of 100 grams is carbon.

2. Calculate the number of grams of hydrogen and carbon in the compound:

   • Hydrogen: 10% of 100 grams = 0.10 * 100 grams = 10 grams
   • Carbon: 90% of 100 grams = 0.90 * 100 grams = 90 grams

3. Calculate the number of moles of hydrogen and carbon using their respective molar masses:

   • The molar mass of hydrogen (H) is approximately 1 g/mol.
   • The molar mass of carbon (C) is approximately 12 g/mol.

   Number of moles of hydrogen = 10 grams / 1 g/mol = 10 moles Number of moles of carbon = 90 grams / 12 g/mol = 7.5 moles

4. Find the ratio of moles of hydrogen to moles of carbon:

   Moles of hydrogen : Moles of carbon = 10 moles : 7.5 moles

5. To simplify the ratio to whole numbers, you can divide both values by the smallest number of moles, which is 7.5:

   Moles of hydrogen : Moles of carbon = 10 moles / 7.5 moles : 7.5 moles / 7.5 moles = 4 : 3

6. Now that you have the ratio of moles of hydrogen to carbon, you can use this ratio to determine the empirical formula. In this case, it's a 4:3 ratio.

So, the empirical formula of the organic compound is H4C3, or you can write it as CH3.