formulas

Question 1

What is the pressure formula?

Answer 1

Pressure = Force / Area

Question 2

What is the Ideal Gas Law?

Answer 2

PV = nRT

Question 3

What is Dalton’s Law of Partial Pressures?

Answer 3

P(total) = P1 + P2 + P3 + ….

Question 4

What is Boyle’s Gas Law (and what is fixed)?

Answer 4

P1V1 (n and T are fixed)

Question 5

What is Charles’ Gas Law (and what is fixed?)

Answer 5

V1/T1 (n and P are fixed)

Question 6

What is Avogadro’s Gas Law (and what is fixed)?

Answer 6

V1/n1 ( T and P are fixed)

Question 7

What’s the formula for finding total vapor pressure?

Answer 7

P(total) = P(atm) = P(gas) + P(water)

Question 8

At STP, what atmosphere do we use?

Answer 8

1 atm

Question 9

At STP, what temperature do we use?

Answer 9

273.15K

Question 10

If we change the ideal gas law, to solve for Molar mass, what would the equation look like?

Answer 10

M = mRT/PV

Question 11

If we change the ideal gas law, to solve for density, what would the equation look like?

Answer 11

d = PM/RT

Question 12

What is the formula to find partial pressure?

Answer 12

P1/P(total) = n1/n(total)

Question 13

What is the conversion of torr to atm?

Answer 13

760 torr = 1 atm

Question 14

What is the conversion of atm to mmHg?

Answer 14

1 atm = 760 mmHg

Question 15

First Law of Thermodynamics

Answer 15

q_system= -q_surr

Question 16

Total energy of a system

Answer 16

∆E = heat (q) + work (w)

Heat is the diff. in T between surr. and sys. and w the work applied

Question 17

Calorimeter equation

Answer 17

q_calorimeter= heat capacity_calorimeter * ∆T

Question 18

Graham’s Law of Effusion

Answer 18

R_eff∝ 1/√M

R_eff is inversely proportional to the square root of M.

Question 19

When comparing eff. rates for two gases at same temp.

Answer 19

Rate_A/Rate_B = √M_B/√M_A

This proves that Graham’s Law of effusion is true

Question 20

barometric equation

Answer 20

P_gas=P_atm,
P_gas=P_atm-∆h,
P_gas=P_atm+∆h

Question 21

Combined gas law

Answer 21

P₁V₁/T₁=P₂V₂/T₂

Question 22

Enthalpy ∆H

For limiting reactant

Answer 22

∆H_rxn=-q_rxn/mols of limited reactant

Question 23

At STP, what is 1 mole of any gas?

Answer 23

1mol any gas = 22.4L (not exact)

Question 24

V_rms

Answer 24

V_ave = √((3RT)/M)

Question 25

In van der walls equation, what does a represent? b?

Answer 25

a represents the effect of intermolecular attractive forces on pressure. b represents the effect of particle size on volume.

Question 26

What is a state function?

Answer 26

The property of a system where the starting and ending points are essential, not *how* it got from point a to point b.

Question 27

In terms of calorimetry, what is ∆H_soln?

Answer 27

∆H_soln = (q_solute)/moles of solute

Question 28

∆H_rxn heat abosrbed/released by the whole reaction

Answer 28

∆H_rxn = (q_rxn -)/mols of limiting reactant

Question 29

Converting from Celsius to Fahrenheit

Answer 29

F=(ºC*9/5)+32

Question 30

Converting from Fahrenheit to Celsius

Answer 30

C=(ºF-32)5/9

Question 31

Equation used for a whole system/calorimeter

Answer 31

q=C∆T | C=specific heat capacity for entire calorimeter/system.

Question 32

Enthalpy change's relation to internal energy.

Answer 32

∆H=∆E+P∆V

Question 33

calculating actual yield

Answer 33

actual yield = (% yield)(theoretical yield)

Question 34

Average amu calculation

Answer 34

Average amu = ∑(abundance * amu)

Question 35

% yield

Answer 35

actual/theoretical

Question 36

m/m

Answer 36

g solute / g solution * 100%

Question 37

w/v

Answer 37

mass/volume * 100

Question 38

v/v

Answer 38

v/v (mL solute/mL solution) * 100%

Question 39

Dilutions formula

Answer 39

M1V1=M2V2

Question 40

standard thermochemical conditions (STC)

Answer 40

25ºC 1 atm and 1M

Question 41

∆Hºrxn

Answer 41

∆Hºrxn = ∑m∆ Hºf(products) - ∑n∆Hºf(reactants) | set the equation to a net ionic equation first and then use this