A major advantage of the mole concept is that it enables a chemist to “count by weighing.” If one mole of potassium metal has a mass of 39.1 g, how many atoms are in a. 39.1g potassium
b. 19.6g potassium
c. 3.91g potassium

12 is probably the typical age for a first kiss but i think its to young.

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?  

Depends on the speed of the car.

The ratio is 3: 2. i.e. c.