Question #5a7e3

1 Answer
May 11, 2016

Answer:

Mass is measured in grams. Scales are calibrated to read a mass, but not moles. The mass of an element is relative to the lightest element on the periodic table(hydrogen). Thus, we have the atomic masses of each element. We can convert a mass of a substance to moles to compare to other moles.

Explanation:

A mole is a general term we use to compare substances, similar to comparing dozens of items. When you hear a dozen somethings, you can think of a special number that represents a dozen (12 somethings=1 dozen somethings).

A mole is equivalent to #6.02# x #10^23# molecules.

A mole is equivalent to the molar mass of an element or molecule with a common unit: (#g#/#"mol"#).

A mole is equivalent to #22.4# #L# of a gas at STP(standard temperature and pressure or #273# #K# and #1# #atm#).

These equivalents are used in conversion problems.