calculate tje the number of atoms in 1)10 moles of neon
2) 50 mole of oxygen
3) 20 moles of CH⁴
Answers
Answer:
Mole Calculations
Chemical Equations and Stoichiometry
Lecture Topics
Atomic weight, Mole, Molecular Mass, Derivation of Formulas, Percent Composition
Chemical Equations and Problems Based on
Miscellaneous Problems, Solution Problems, Review Handout
Demo Mole Quantities
58.5g NaCl(mol/58.5g)(6.02 x 1023/mol) = 6.02 x 1023 Na
+
Cl21 pre-1982 pennies (after 1982 pennies are mostly zinc with copper coating)
63.5g Cu( mol/ 63.5g)(6.02 x 1023/mol) = 6.02 x 1023 Cu
19.0g Al (mol/27.0g)(6.02 x 1023/mol) = 4.24 x 1023 Al
Demo of Oxidation Reactions
Flash bulb
2Mg + O2 2MgO fast
2Cn + O2 2CnO slow
Copper Oxide Penny
2Cu + O2 2CuO
Intro to Chapter
Stoichiometry is the process of making calculations based on formulas and balanced equations
Since Modern Chemistry involves:
Symbolic representation of models
Mathematics
Quantitative measurements
You are going to be using lots of symbols and equations and doing lots of calculations
The fundamental Question –
How do you go from combining ratio of atoms (like H2O) to something you can measure in lab?
OR How do you go between number of atoms and mass of that collection of atoms?
Explanation: