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Download Chemical Formulas and Moles. Example: 1.water (C) – every molecule of water contains 2 atoms of hydrogen & one atom of oxygen - 2 molecules of H 2 O would

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Chemical Formulas and Moles

Example: 1.water (C) every molecule of water contains 2 atoms of hydrogen & one atom of oxygen- 2 molecules of H2O would contain 4 atoms of hydrogen & 2 atoms of oxygen- 6.02 x 1023 molecules of H2O would contain 1.20 x 1024 atoms of hydrogen & 6.02 x 1023 atoms of oxygenA simpler way of writing this last statement would be:One mole of H2O molecules contains 2 moles of hydrogen atoms and one mole of oxygen atoms.The subscripts in a chemical formula can be read as the number of atoms of each element in one molecule of the compound, OR, the number of moles of each element in one mole of the compound.

CO2 contains 1 mole of C atoms and 2 moles O atoms.C2H5OH contains 2 moles of C atoms, 6 moles of H atoms, and 1 mole of O atoms.Sample Problems:1. How many moles of each element are in 3.0 moles of H3PO4?2.How many moles of oxygen are there in 0.025 moles of aluminum sulfate?

3.How many moles of oxygen atoms are there in 24.8 g of carbonic acid?

4.How many atoms of hydrogen are present in 0.700 moles of ammonium sulfate?

5.Determine the number of oxygen atoms found in 12.3 g of sulfuric acid.Percent Composition of a SubstanceUsing the chemical formula of a compound, it is possible to calculate the percent composition of each element within that compound.To do this, divide the mass of the element in one mole of the compound by the molar mass of the compound, than multiply by 100%.Calculate the percent composition of sugar C12H22O9

Ideal Gas Law Another fluid. Chemistry is all about… MOLES! MOLES! MOLES! (Nice job – class dismissed.)

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Solution Concentration Molarity(M): Moles solute/1L solution Molality (m): Moles solute/1kg solvent Mole fraction (X A ): Moles A* total moles solution

Stoichiometrycourses.spectrum.sd61.bc.ca/teacherFolders/Quast/chem11...2 MOLES of hydrogen react with one MOLE of oxygen to make two MOLES of water 11 The coefficients refer to the

2. Balance de Moles

MOLE CONCEPT AND STOICHIOMETRYtestlabz.com/modelpapers/5_17_54_306.pdf · 2 moles 1 mole 2 moles 1 mole of oxygen produces steam = 2 moles ∴ 0.5 mole of oxygen produces steam =

MOLES! MOLES! MOLES!

Catalyst 1. How many moles are in 42 g of NaOH 2. How many grams are in 2 moles of HBr End

· ... According to the following balanced reaction, how many moles of HN03 are formed from 8.44 moles of N02 if there is plenty of water present?

gcseprep.com · Web viewMoles of ethanoic acid at equilibrium = moles sodium hydroxide (1) Moles ester = moles water (=moles acid reacted) (1) = 0.200 – 0.108 = 0.090 to 0.092 (1)