Question

Calculate the empirical formula of a substance, on analysis, is found to contain: 50% water of crystallization, 19.1% oxygen, 18.2% of sodium and 12.7% sulfur.

PERSON WILL BE MARKED AS BRAINLIEST.

Answer 1

The empirical formula of the substance is Na₂SO₃.7H₂O.

• Let's assume that the total mass of the given substance is 100g.
• Therefore, we have 50 g H₂O, 19.1 g oxygen, 18.2 g sodium and 12.7 g sulfur.
• Now, calculate the number of moles present of each element.

            H₂O = 50/18 = 2.8 moles

             Na = 18.2/23 = 0.8 moles

              O = 19.1/16 = 1.2 moles

              S = 12.7/32 = 0.4 moles

• Divide all of the above values by the smallest number i.e., 0.4. This gives the following mole ratios:

              Na: S: O: H₂O = 2: 1: 3: 7

• Hence, the empirical formula is Na₂SO₃.7H₂O

Answer 2

Answer:

Explanation:

first you have to divide the substance percentage with Mr and then you have to divide it with the shortest one and that's how we will have the

the empirical formula