55.0 mL of a 1.60 M solution is diluted to a volume of 208 mL. A 104 mL portion of that solution is diluted using 189 mL of water. 1. How many moles of solute were in the initial solution?

Diluting the solution to 208 mL does not change the original number of moles, but dividing that solution in half does.

2. How many moles of solute were in the 104 mL portion?

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

58750.08068 is the answer i think