Question

calculate the empirical formula of a substance which,on analysis,is found to contain:50%water of crystallisation,19.1% oxygen,18.2% sodium and 12.7% sulpher.​

Answer 1

Answer:

Na₂SO₃.7H₂O

Explanation:

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:

mishi hellow

Explanation:

kya kar rahi ho miss

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