Asap !

the structural formula for butane is: ch3-ch2-ch2-ch3 which of these structures represents a correct isomer of butane?
a. ch3-ch2- ch3 ch3

b. ch3-ch- ch3 ch3

c. ch3-ch2- ch3 ch2

d. ch2-ch2- ch3 ch3

I believe the answer is A. However, I would double check the formula.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying