We can be sure that a mole of table sugar and a mole of vitamin c are equal in their
a. mass c. number of atoms.
b. volume d. number of molecules

The correct answer is option d, that is, the number of molecules.

Explanation:

Mole is illustrated as the given mass of the substance divided by the molecular mass of that substance. A mole of table sugar and a mole of vitamin C are not equivalent in mass. Volume is directly equivalent to mass. Mass can be different, thus, the volume can also be different.  

The vitamin C and sugar are the compounds, which are formed of distinct elements combined in the particular molecular ratio. Thus, the number of atoms cannot be similar, also the mass and volume will not be similar for both vitamin C and sugar.  

One mole of a substance comprises 6.023 * 10^23 molecules. This is called Avagadro's number. This is similar for all the components, hence, one mole of vitamin C and one mole of table sugar comprise a similar number of molecules.  

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

the answer u all are looking for is 4000000000000000000000 million years.