What volume of oxygen is produced at room temperature when 0.142 grams of potassium superoxide, KO2, reacts with excess carbon dioxide, CO2? what mass of calcium carbide, CaC2 (s), is required to produce 120cm^3 of ethyne gas, C2H2(g), by reaction with excess water according to the equation:
CaC2+2H2O->Ca(OH)2+C2H2

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.