Question

Question ❓✔️❓ 1)

An organic compound containing oxygen, carbon, hydrogen and nitrogen contains 20% carbon, 6.7 % hydrogen and 46.67 % nitrogen. Its molecular mass was found to be 60. Find the molecular formula of the compound. 2) 1.00 g of hydrated salt contains 0.2014 g of iron 0.1153 g of sulfhur 0.2301 g of oxygen and 0.4532 g of water of crystallisation find empirical formula . ​

Answer 1

Answer:

First part of the question is in the attachment.

Let's solve the second part of the question.

2)

Given mass of elements:

• Iron (Fe) = 0.2014 g

• Sulfur (S) = 0.1153 g

• Oxygen (O) = 0.2301 g

• Water (H₂O) = 0.4532 g

Molar mass of elements:

• Iron (Fe) = 56 g/mole

• Sulfur (S) = 32 g/mole

• Oxygen (O) = 16 g/mole

• Water (H₂O) = 18 g/mole

Number of moles of each Elements:

• Number of moles = Given mass/Molar mass

• Fe = 0.2014/56 = 0.0036 moles

• S = 0.1153/32 = 0.0036 moles

• O = 0.2301/16 = 0.014 moles

• H₂O = 0.4532/18 = 0.025 moles

Simplest whole number ratio:

=> Fe = 0.0036/0.0036 = 1

=> S = 0.0036/0.0036 = 1

=> O = 0.014/0.0036 = 3.89 ≈ 4

=> H₂O = 0.25/0.0036 = 6.945 ≈ 7

Empirical Formula:

=> Fe₁S₁O₄•7 H₂O