2 - Amount of Substance

Question 1

what are the similarities and differences between relative atomic mass, relative molecular mass, and relative formula mass

Answer 1

Each is compared to a 12th of the mass of a carbon 12 atom, but RAM or Ar is for the mass of one atom of an element, RMM or Mr is for molecules, and RFM also Mr is for ionic compounds as they don’t exist as molecules

Question 2

what is Avogadro’s constant / the mole

Answer 2

a mole is the number of carbon 12 atoms needed to make up 12 grams

6.022 x 10^23

Question 3

Ideal gas equation

Answer 3

PV=nRT
or
PV=NkT

Question 4

What is Boyle’s law

Answer 4

In constant temp, Pressure x Volume is constant

Question 5

What is Charles’ law

Answer 5

In constant Pressure, Temp and Volume are proportional

Question 6

What is Gay-Lussac’s law, or the Constant Volume law

Answer 6

In constant Volume, Temp and Pressure are proportional

Question 7

What is the empirical formula

Answer 7

The simplest whole number ratio for all of the elements

Question 8

What is the molecular formula

Answer 8

The number of each element in a molecule of a substance