Question

how many grams present in 0.75 moles of coal (carbon)​

Answer 1

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?