Chem 2- Amount of substance Flashcards
(23 cards)
What is the calculation for Relative Atomic Mass?
RAM = Mass / Moles
What is the Avogadro constant?
6.022 x 10^23
What is the calculation for concentration?
Conc = Moles / volume
How do you work out the number of moles in a given volume?
Moles = concentration / 1000
What is the ideal gas equation?
P x V = n x R x T
What does P stand for in the ideal gas equation?
Pressure
What does V stand for in the ideal gas equation?
Volume
What does n stand for in the ideal gas equation?
Moles
What does R stand for in the ideal gas equation?
Gas constant
What does T stand for in the ideal gas equation?
Temperature
What must pressure be in?
Pa
What must volume be in?
M^3
What must T be in?
K
What must R be in?
JK-1mol-1
How would you rearrange the ideal gas equation to find volume?
V = nRT/P
How would you rearrange the ideal gas equation to find the moles?
n = PV/RT
What are the three steps to finding the empirical formula?
- Find the masses of each elements
- Find the number of moles of atoms of each elements
- Find the simplest ratio.
What’s the equation for % atom economy?
molecular mass of desired product/ sum of molecular masses of all reactants x100
What is an empirical formula?
Gives the simplest whole number ratio of atoms of each elements
What is a molecular formula?
Give the actual numbers of atoms of each element in a compound
What’s the equation for percentage yield?
Actual yield/ theoretical yield x100
Why are processes with high atom economies better for the environment?
They produce less waste
What is atom economy?
a measure of the proportion of reactant atoms that become part of the desired product in the balanced chemical equation
