Answer:
 the answer is C4H10 I hope I helped
 
        
             
        
        
        
The sub-atomic particles of an atom are the proton, electron and the neutron. An electron has a charge of -1 and a smaller
mass than a proton. Proton has the same mass with the neutron. The ratio
between the mass of a proton and an electron is about 2000. An electron has an
equal value but negative charge with the proton.
 
        
             
        
        
        
Dccccccccccccccccccccccsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
        
             
        
        
        
Answer: -
The concentration of solution which contains 2.5 g of sugar dissolved in 50 g of water is 5 % (w/w)
Explanation: -
Amount of sugar = 2.5 g
Mass of water = 50 g
Concentration of sugar = 
 x 100
 = 5%
Thus the concentration of sugar is 5 % (w/w)