How much water can be heated from
15 C to boiling with
a gas burner with an
efficiency of 35% by
burning 100 l of
natural gas?

The mass is  

Explanation:

From the question we are told that

     The initial temperature is  

      The final  temperature is  

Generally the maximum heat produced by  1  Liter   of  natural gas is  

 So the amount of heat produced by 100 L is  

=>          

Generally given that the efficiency is  

Then actual heat received by the water is

=>

=>

Converting to kcal  

=>

Generally the specific heat of water is  

Generally the heat received by the water is mathematically represented as

=>    

=>    

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.