Chemistry 121 Formulas and Constants

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Chemistry

60 Terms

1

Fahrenheit (F)

\dfrac{9}{5}\left( °C+32\right)

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2

Celsius (C)

\dfrac{5}{9}\left( °F-32\right)

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3

Kelvin (K)

°C+273

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4

Density (d)

\dfrac{m}{V}

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5

1 amu =

1.66054\times 11^{-24}g

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6

Atomic weight

\Sigma [(mass)(% fractional abundance)]

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7

Percentage to decimal

Divide by 100

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8

Percent composition

% element =

[(# of atoms)(molecular weight)/ molar mass of the compound] x 100

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9

Avogadro’s number

6.02\times 10^{23} atoms or molecules

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10

Percent yield

(actual yield/theoretical yield) x 100

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11

Empirical to molecular formula

given mass of molecular formula/ molar mass of empirical formula = multiplier

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12

Molarity (M)

\dfrac{n}{V}

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13

Dilution (before and after)

M_{1}V_{1}=M_{2}V_{2} or M_{c}V_{c}=M_{d}V_{d}

(c = concentrated, d = diluted)

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14

If \Delta E >0

Endothermic

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15

If \Delta E <0

Exothermic

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16

Change in internal energy (\Delta E)

E_{f}-E_{0}

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17

Exchange of energy betweem system and surroundings

\Delta E=q+\omega

q = heat

w = work

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18

Work

PV or -PV

P = pressure

V = volume

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19

Enthalpy (H)

E+PV

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20

Change in enthalpy (\Delta H)

\Delta E+P\Delta V

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21

Enthalpy of reaction

\Delta H_{rxn}=H_{products}+H_{reactants}

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22

Calorimetry

q=mc\Delta T

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23

Specific heat for H2O

4.184 J/g°C

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24

Hess’s law

\Delta H=\sum products-\sum reactants

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25

Bond enthalpy

\Sigma bonds broken - \Sigma bonds formed

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26

Speed of light (constant)

c=3.00\times 10^{8}m/s

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27

Speed of light (formula)

c=\lambda v

\lambda = wavelength

v = frequency

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28

Energy is proportional to frequency

E=hv

h = plank’s constant

v = frequency

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29

Plank’s constant (h)

6.626\times 10^{-34}J\cdot s

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30

Dipole moment (\mu)

Qr

Q = charge

r = distance

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31

Charge (Q)

1.60\times 10^{-19}C

C = Coulomb

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32

1 D =

3.335\times 10^{-30}C\cdot m

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33

1 A =

10^{-10}m

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34

Formal charge

v.e. - lines - dots

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35

6

octrahedral

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36

Bond order

\dfrac{1}{2} (bonding e - antibonding e)

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37

Pressure (P)

\dfrac{F}{A}

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38

Pascals

1 Pa = 1 N/m²

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39

Bar

1 bar = 105

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40

Pa =

100 kPa

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41

Atmosphere

1 atm = 760 torr = 760 mmHg

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42

Hg =

101.325 kPa = 1.10325 bar

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43

STP 1

1 atm

760 torr (mmHg)

101.325 kPa

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44

Boyle’s law

P_{1}V_{1}=P_{2}V_{2}

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45

Charles’s law

\dfrac{V_{1}}{T_{1}}=\dfrac{V_{2}}{T_{2}}

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46

Gay-Lussac’s law

\dfrac{P_{1}}{T_{1}}=\dfrac{P_{2}}{T_{2}}

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47

Combined gas law

\dfrac{P_{1}V_{1}}{T_{1}}=\dfrac{P_{2}V_{2}}{T_{2}}

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48

Avogadro’s law

\dfrac{V_{1}}{n_{1}}=\dfrac{V_{2}}{n_{2}}

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49

STP 2

V = 22.4 L

T = 0°C = 273 K

P = 1 atm

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50

Ideal gas law

PV=nRT

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51

R constant

0.08206 \dfrac{L\cdot atm}{mol\cdot K}

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52

n

moles

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53

M

molar mass

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54

m

mass

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55

Density of gases

d=\dfrac{MP}{RT}

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56

Dalton’s law of partial pressures

P_{t}=P_{1}+P_{2}+P_{3}

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57

Mole fraction

X_{1}=\dfrac{n_{1}}{n_{t}}

n_{1} = moles of compound (part)

n_{t} = total mass (whole)

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58

Pressure and mole fraction

P_{t}=X_{2}P_{t}

X = mole fraction

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59

Urms and molecular mass

u_{rms}=\sqrt{\dfrac{3RT}{M}}

R = 8.314 J/mol·K

R = 8.314 kg·m2/ s2·mol·K

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60

Graham’s law describes diffusion and effusion

\dfrac{r_{1}}{r_{2}}=\sqrt{\dfrac{M_{2}}{M_{1}}}

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