Lec 2: Stoich + Gases

Question 1

How to find Limiting Reagent?

Answer 1

if given eqn and g of reactants reacted, convert them to mols, then compare them: if one has coefficent of 1, convert the OTHER reactant to this one by multiplying by the molar ratio and compare the values (MUST BE FOR SAME REACTANT)
- Whichever value is smaller is the limiting reagent
- larger is excess

Question 2

how to find theo yield?

Answer 2

If given actual yield, you dont need this.
- FOCUS: LR (tells us highest amount product possibly made) convert to moles of interested product w molar ratio, then convert to grams

Question 3

Whats the % yield formula

Answer 3

actual/theo x 100%

Question 4

What are the 3 main gas laws? (ABC), whats the difference b/w them

Answer 4

Avogadro, Boyles, Charles
they all discuss V, but relation to 3 other things

Question 5

Boyles law (BP)

Answer 5

V = k/P
P and V are inversely proportional

Question 6

Charles law (CT)

Answer 6

V =bT
T and V proportional

Question 7

Avogadros law (AM)

Answer 7

V = an
mol present and V proportional

Question 8

What do K, b, a represent ?

Answer 8

UNIVERSAL GAS CONSTANT ‘R’

Question 9

according to IGL, where is most ideal gas behavior found?

Answer 9

low pressure, high temperature (keeps good distance)

Question 10

Whats the density equation?

Answer 10

d = mass (g)/ V

Question 11

how can we calculate density using IGL

Answer 11

deconstruct: PV = nRT > P = dRT/M

Question 12

What can we say about partial pressures and how this relates to total P of a gas mixture?

Answer 12

Total P of gas is sum of indiv gas pressures
Ptotal = P1 + P2 + P3 etc..