If we want equal numbers of molecules of different substances, will it work to take equal weights those substances?

The force of attraction between molecules of different substances is

Will the number of molecules be the same in equal weoights of different substances?

Is it possible to weigh one molecule using a weights of different substances?

The mass of a single molecule of a substance is 8.5 xx 10^-23 gram. The molecular mass of the substance is

How are the number of moles of a substance obtained from the mass of the substance ?

true or false: Different substances have different melting points

_________ is defined as the phenomenon of accumulation of higher concentration of molecules of one substance on the active surface of other substance than in the bulk due to unbalanced force of attraction.

______ is the phenomenon of accumulation of higher concentration of molecules of one substance on the surface of other substance than in the bulk.

Solve the following examples: If 0.2 mol of the following substances are required how many grams of those substances should be taken? Magnesium oxide