The+Mole+Concept+and+Finding+Molar+Mass

The Mole Concept and Finding Molar Mass
** Vocab: MOLE: ** A MOLE is the number of carbon atoms in exactly 12g of carbon.
 * MOLAR MASS: ** The MOLAR MASS is the mass of ONE MOLE of the particles. (text p.79)


 * Molar mass is shown on the bottom of each block in the perodic table
 * The molar mass of each single element is the atomic mass of each atom
 * For a molecule, molar mass of the molecule is the sum of the molar mass of the molar mass of all the atoms.

 Important points to remember:
 * 1) The unit of molar mass is g/mol
 * 2) The number of molar mass of the element is as the same as the atomic mass.
 * 3) The molar mass of the molecule is the sum of each element in this molecule.

How to calculate the molar mass of the molecule?  EX: Find the molar mass of the CH3COOH The molar mass of each C atom is 12 g/mol. The molar mass of each H atom is 1 g/mol. The molar mass of each O atom is 16 g/mol. The # of C is 1+1= <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">2 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;"> The # of H is 3+1= <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">4 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;"> The # of O is 1+1= <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">2 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;"> So the molar mass of CH3COOH is ( <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">12 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/molX <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">2 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">) +( <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">1 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/molX <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">4 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">)+( <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">16 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/molX <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">2 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">)= <span style="background-color: #ffffff; color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">60 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/mol

<span style="background-color: #ffffff; color: #ff0000; font-family: 'Comic Sans MS',cursive; font-size: 150%;">Remember:The molar mass is rounded off to one decimal place! <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">

If the molecule has __hydrate__, the molar mass of the hydrate should be included. EX: Find the molar mass ofMgSO4__•7H2O__. The molar mass of Mg atom is <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">24 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/mol. The molar mass of S atom is <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">32 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/mol. The molar mass of O atom is <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">16 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/mol. The molar mass of H atom is <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">1 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/mol. The # of Mg is <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">1 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;"> The # of S is <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">1 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;"> The # of O is 4+7= <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">11 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;"> The # of H is 7X2= <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">14 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;"> So the molar mass of MgSO4•7H2O is ( <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">24 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/molX <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">1 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">)+( <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">32 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/molX <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">1 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">)+( <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">16 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/molX <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">11 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">)+( <span style="background-color: #ffffff; color: #ff00ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">1 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/molX <span style="background-color: #ffffff; color: #008000; font-family: 'Comic Sans MS',cursive; font-size: 140%;">14 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">)= <span style="background-color: #ffffff; color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">246 <span style="background-color: #ffffff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">g/mol

__<span style="color: #0073ff; font-family: 'Comic Sans MS',cursive; font-size: 130%;">reference: chemistry textbook pg79. __ __<span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">[] __

<span style="color: #800080; font-family: 'Comic Sans MS',cursive; font-size: 140%;">Practice Questions:


 * 1) <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">Find the molar mass of Al2(SO4)3?
 * 2) <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">What is the molar mass of Ni(H2O)2(NH3)4Cl2 ?
 * 3) <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">Find the molar mass of Pb(C2H3O2)2•3H2O?
 * 4) <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">Find the molar mass of Na2S2O3•5H2O?
 * 5) <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">What is the molar mass of Co2Fe(CN)6?
 * 6) <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">What is the molar mass of Al2(C2O4)3•4H2O?