Chapter 10 chemistry: The Mole

the relative scale of atomic masses in amu is also a relative scale of..

masses in grams

the atomic mass of an element, expressed in grams, in the…

the mass of 1 mole of that element

molecular mass is measured in

g/mol

Avogadro’s hypothesis

volumes of all gases at the same temperature and pressure contain equal numbers of particles

gases are compressible so under pressure particles are…

closer together

standard temperature and pressure (STP)

 0°C and 1 ATM of pressure

molar volume of a gas is

the volume of 1 mole of the gas at a given temperature and pressure

At STP, 1 mole equals..

22.4L

Gas density

• D= M/V

• Volume fro any gas is the same

• Density will then depend of molar mass

• Measured in g/L

Percent composition

the percent by mass of each element in a compound

hydrate

a compound that has one or more water molecules bound to each formula unit

how to write a hydrate formula

the chemical formula, then a dot, and then the coefficient of how many water molecules there are per formula unit

empirical formula are written as

C₂H₄