W5 - Electrolytes, Miliequivalent, Molarity, Molality

What is the molecular weight of a substance in grams?

mole

__ is one thousandth of a mole and __ is one millionth of a mol

millimole; micomole

T/F: mole is an expression of concentration, not amount

F (mole)

In a solution, ______ expressed the number of solute moles per volume of solution, usually one litre.

molarity (M)

In a solution, molarity (M) expresses the number of solute moles per _____ of _____, usually one litre

volume of solution

T/F: Molarity is an expression of concentration, not amount

T (Molarity)

One molar solution is shown as…

1 mole/1000 mL (or 1 mole/Lit)

What is the disadvantage of molarity?

changes with change in volume of solution

What can cause a change in volume?

1. change in temperature → causes expansion and contraction

2. addition of another ingredient

What does Molality represent?

moles of solute in 1000 grams of solvent

What is mole fraction?

ratio of the moles of one of the constituents of a solution to the total moles of all the constituents (solutes and solvent)

What is mole percent?

moles of one constituent in 100 moles of all the components in the soln (or mixture)

How to calc mole percent?

mole fraction multiply by 100