hooker chem1a FINAL_cheatsheet

hooker chem1a FINAL_cheatsheet - CONVERSIONS AMONG ATOMS...

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CONVERSIONS AMONG ATOMS, MOLES, MASS: Atoms (6.022e23) moles (molar mass) grams DEFINITIONS: oxidation involves loss of electrons. Reduction involves gain of electrons. STP: standard temp. and pressure: 273 k and 1 atm. FORMULAS: Chapter3 (stoichiometry): * Percent yield=(actual yield/theoretical yield) x 100% Chapter4 (rxns & solutions) * Molarity [M]= moles of solute/ liter of solution *Moles of solute remain identical: M1V1=M2V2 *1 part per million (ppm)= 1 mg(element) / 1 L solution Chapter5 (gases) PV=nRT X i=ni/ntotal =pi/ptotal True at STP: 1 mol E/22.4 L can help you find moles of desired element. Kinetic energy of gas: KE=(3/2)RT Root mean sq. velocity: U rms=sq. root of (3RT/M) Effusion: sq. root of (M1/M2)=Rate2/Rate1 Van der waals eq: [ P + a ( n / V )^ 2 ] ( V-nb )= nRT or P= nRT/ (V-nb) - a (n/V)^2 a =.034 atm L^2/mol^2; b= 0.0237 Lmol Chapter6 (chemical equilibrium) Equilibrium constant K= [product/reactant] R= 0.08206 L*atm/K*mol R= 8.3145 kg m sq./ s sq. or J/Kmol - only for root mean sq. velocity *Chapert6 Equilibrium K p= K(RT)^delta n
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