UNIT 8 Study Guide

Question 1

The molar mass of a compound is:

Answer 1

the sum of the atomic mass of its atoms

Question 2

The molar mass (gram formula mass) =

Answer 2

mass of 1 mole of that compound

Question 3

What type of composition do compounds have?

Answer 3

definite composition

Question 4

Since compounds have a definite composition, they are:

Answer 4

pure substances

Question 5

Because of definite composition, compounds will always be:

Answer 5

the same % composition

Question 6

Empirical Formulas:

Answer 6

simplest whole # ratio of the # of atoms of each element in a compound formula

Question 7

Molecular Formula:

Answer 7

actual formula for a molecular compound (formula may be empirical or a multiple of an empirical Formula)

Question 8

All ionic formulas are :

Answer 8

empirical formulas (simplest whole # ratio)

Question 9

n=

Answer 9

whole number multiple of the empirical formula

Question 10

One mole of carbon has a mass of:

Answer 10

12.01 g that contains 6.022 x 10^23 carbon atoms

Question 11

Avogadro determined that a mole of gas (any) at STP would:

Answer 11

always fill a volume of 22.4 L/mol

Question 12

STP:

Answer 12

standard temperature and pressure