5. Desde 100 g de un compuesto formado por carbono, hidrogeno y oxígeno, se obtiene 39,132 g de agua y 95,656 g de CO2. Determine:

A. La fórmula empírica del compuesto.

     

Explanation:

The question in English is:

5. From 100 g of a compound formed by carbon, hydrogen and oxygen, 39.132 g of water and 95.656 g of CO₂ are obtained. Determine:

A. The empirical formula of the compound.

Solution

All the carbon of the compound ends as carbon in the CO₂ and all the hydrogen in the compound ends in the water.

1. C in CO₂

Divide the mass of CO₂ by its molar mass and multiply by the molar mass of C:

       

2. H in H₂O

Divide the mass of H₂O by its molar mass and multiply by 2 times the molar mass of H:

       

3. Calculate O by difference

     

4.Divide the mass of each element by the corresponding atomic mass to find the number of moles of the element

C: 26.379g / (12.011g/mol) = 2.196 molH: 4.379g / (1.008g/mol) = 4.344 molO: 69.242g / (15.999g/mol) = 4.328 mol

5. Divide by the least number of moles

C: 2.196/2.196 = 1H: 4.344 / 2.196 ≈ 2O: 4.328 / 2.196 ≈ 2

Those are the subscripts of the empirical formula:

6. Empirical formula

         

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.

Answerbonded to an amino group(nh2);