Which has the greatest mass? 1 mole Ca 1 mole CO 1 mole O2 1 mole CH4 1 mole NO

1 mole of has the greatest mass.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP , contains avogadro's number of particles and weighs equal to the molecular mass of the substance.

1 mole of has a mass of 40 g.

1 mole of has a mass of 28 g

1 mole of has a mass of 32 g

1 mole of has a mass of 16 g.

1 mole of has a mass of 30 g.

Thus the greatest mass is of 1 mole of

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.