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TOLEDO / Chemistry / MBC 1230 / What is the percent yield of h2o if 138g is produced from 16g of h2 an

# What is the percent yield of h2o if 138g is produced from 16g of h2 an Description

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General Chemistry Midterm Exam 1 Study Guide

## What is the percent yield of h2o if 138g is produced from 16g of h2 and excess o2?    ## What is the smallest ratio of elements? Conversions

Ex) 355 km  10^3m  10^­3s = 355 m

S     1 km       ms              ms

Empirical Formula is the smallest ratio of elements.

Ex) C2 H3 O2 is empirical

C4 H6 O4 is not empirical. 2 can be divided out of them all.

Molecular formula is a multiple of the empirical formula.

Ex) Limiting reactant

## What is a multiple of the empirical formula? If you want to learn more check out What is the main cause of disease?

NH3 + O2         NO + H2O NO is the limiting reactant.

Percent Yield

Actual yield          * 100%

Theoretical Yield

What is the percent yield of H2O if 138g is produced from 16g of H2 and excess O2? 2H2 + 02 = 2H2O

# g H2O = 16g H2 * 1 mol H2 * 2 mol H2O * 18.02g H20 = 143g H2O                                   2.02g H2    2 mol H2        1 mol H2O

% yield = actual * 100%  = 138g H2O *100% = 96.7%

theoretical              143g H2O  We also discuss several other topics like How can exchange theory be used to understand/interpret actors behavior?
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Formulas

Grams given * 1 mol * 6.022x10^23 molecules = ?molecules

Molar mass         1 mol

Of element(s)

XMass given * 1 mol of X     *   Ymoles given in formula   *  Grams of Y   = Grams of Y                   Molar mass of X        X moles given in formula       1 mol of Y

Molarity = Moles of solute              M = n           n = v * M      v = n

Volume of solute (L)                v                                       M

Molarity = mol          M = mol

L                      L

Electrolytes are compounds that ionize and conduct electricity

Strong acids and bases are strong electrolytes

Weak electrolytes are:

∙ HF

∙ HCN

∙ C2H4O2

Soluble Elements and compounds

∙ Li

∙ Na

∙ K

∙ Rb

∙ Cs

∙ NH4+ Don't forget about the age old question of How the behavior is acquired?

∙ NO3­

∙ ClO4­

∙ C2H3O2­

∙ SO4^2­  except Sr^2+ , Ba2+ , Hg2^2+ , Pb^2+ ∙ Cl­

∙ Br­           except Ag+ , Hg2^2+ , Pb^2+

∙ I

Oxidation: loss of one or more electrons

Reduction: gain of one or more electrons

Redox: electrons are transferred

H2 S O4     2(+1) + ? + 4(­2) = 0 net charge

+1  ?  ­2      S = +6

(charges)

Redox: hydrocarbon + 02(g)          CO2(g) + H2O(l)  Titration Net Ionic Equation If you want to learn more check out What is the most effective treatment for panic disorder?
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