21.69mL - 20.70mL = .99mL Fe
7.8 g / .99 mL = 7.9g/mL
One chemical change would be baking the muffin.
One physical change would be chopping the fruits to add to the mixture
C = 12
O2 = 16*2= 32
CO2 = (12)+(16*2) = 44
32/44*100 = 72.73%
The answer would be 6 e-. This is becuase you are turning a charge of -4 into a +2. In order to do this, you transfer 4 electrons for a neutral charge, and an additional 2 for a charge of +2.
This makes a total charge of +2, and the total transferred electrons 6 e-
Ammonium chloride is the correct name for NH4CL
