mass moles particles conversion - Academic Computer Center

1 CHM 1010 SinexChemical CalculationsPractice, practice, moles and Molecules moles and Chemical Reactions moles , Chemical Reactions, and Molarity All done as UNIT CONVERSIONS!!! ..and practice, practice, practiceChemical CalculationsCHM 1010 SinexMass of substance in gramsMoles of substanceNumber of particles of substance(atoms, molecules, or ions)Molar mass of substance g/moleAvogrado s number x 1023 particles /moleMass moles particles conversionsConversion factorsMolar mass sum of atomic masses from periodic tableCHM 1010 SinexChemical CalculationsPractice, practice, many atoms of carbon?atoms C = 9 atoms/molecule * x 1021molecules = x 1022atoms Now find molecules:molecules = moles * = x 1021moleculesFirst find moles : moles = 1000 mg *1g/1000mg * 1mole/180g = molesHow many molecules of aspirin (C9H8O4) in a dose of 1000 mg?

2 Find MM of aspirin:MM = 9*12+8*1+4*16 = 180 g/moleConversion factors in boxesfrom the formula4 For NaHCO3, how many moles do you have? mass of substance AMoles of substance AMMHow many CO2molecules in moles CO2? moles of substance AMolecules of substance x 1023 CHM 1010 SinexChemical CalculationsPractice, practice, way to find = moles of solute/volume of solution in liters ( moles /L)A unit of concentration amount solute per amount solution or solventRearranging the definition of molarity: moles = M x VLFor a solution (homogeneous mixture), there are two components:solute (substance being dissolved) and solvent (dissolving medium, usually water) Another way to find moles !How many moles NaCl in 50 mL of M NaCl?50 mL x 1L/1000 mL x mole/L = mole NaCl6 What is the molarity if 35g KCl are dissolved to make 350 mL of solution?

3 How many moles are in 300 mL of a M NaOH solution? moles of substance AVolume of substance AMolarityCHM 1010 SinexChemical CalculationsPractice, practice, + 13O2 8CO2+ 13/2 X 8/2 X 10 ratiosThe ratio of moles in a reactionClick for answers81 mole CaCO3x 2 mole HCl/1 mole CaCO3= 2 mole HClMoles of substance AMoles of substance BMole ratioThis comes from the balancedchemical reaction!..and it relates substances in the reaction!Mole to mole conversions2 HCl + CaCO3 CaCl2+ H2 OHow many moles of HCl react with a mole of CaCO3?mole ratioCHM 1010 SinexChemical CalculationsPractice, practice, of substance AMoles of substance BMole ratioMass of substance AMolar mass of substance AMass of substance BMolar mass of substance BVolume of substance AVolume of substance BMolarity of solution AMolarity of solution BStoichiometry Molarity (M) = moles of solute/volume in liters of solution moles /LConversion factors10 moles of substance AMoles of substance BMole ratioMass of substance AMolar mass of substance AMass of substance BMolar mass of substance BVolume of substance AVolume of substance BMolarity of solution AMolarity of solution BHow many grams of O2are required to reaction with 10g C3H8?

4 10g C3H8x 1 mole/44g = moles moles C3H8 x 5 moles O2/1mole C3H8= moles moles O2x = 37 g O2C3H8+ 5O2 3CO2+ 4H2 OThis is a classic stoichiometry problem! conversion factors in boxesCHM 1010 SinexChemical CalculationsPractice, practice, of substance AMoles of substance BMole ratioMass of substance AMolar mass of substance AMass of substance BMolar mass of substance BVolume of substance AVolume of substance BMolarity of solution AMolarity of solution BHow many grams of O2are required to reaction with 10g C3H8? 10g C3H8x 1 mole/44g = moles moles C3H8 x 5 moles O2/1mole C3H8= moles moles O2x = 37 g O2C3H8+ 5O2 3CO2+ 4H2O123 Step 1 Step 3 Step 2 Another view of solving12 moles of substance AMoles of substance BMole ratioMass of substance AMolar mass of substance AMass of substance BMolar mass of substance BVolume of substance AVolume of substance BMolarity of solution AMolarity of solution BC3H8+ 5O2 3CO2+ 4H2 OIf 74g O2react, how many grams of CO2will be produced?

5 CHM 1010 SinexChemical CalculationsPractice, practice, of substance AMoles of substance BMole ratioMass of substance AMolar mass of substance AMass of substance BMolar mass of substance BVolume of substance AVolume of substance BMolarity of solution AMolarity of solution B2 HCl + CaCO3 CaCl2+ H2 OWhat volume of stomach acid, M HCl, reacts with g CaCO3? mole CaCO3x 2 mole HCl/1 mole CaCO3= mole g CaCO3x 1 mole/100g = mole mole HCl x 1 moles = L = 130 mL stomach acid 14 moles of substance AMoles of substance BMole ratioMass of substance AMolar mass of substance AMass of substance BMolar mass of substance BVolume of substance AVolume of substance BMolarity of solution AMolarity of solution BThis is a classic titration problem!CH3 COOH + NaOH CH3 COONa + H2 OWhat volume of M CH3 COOH will reaction with mL of NaOH?

6 ML x 1L/1000 mL x mole/L = moles moles NaOH x 1 mole CH3 COOH/1 mole NaOH = mole mole x 1 moles = L = 37 mL CH3 COOHCHM 1010 SinexChemical CalculationsPractice, practice, you find one of the conversion factors? moles of substance AMoles of substance BMole ratioMass of substance AMolar mass of substance AMass of substance BMolar mass of substance BVolume of substance AVolume of substance BMolarity of solution AMolarity of solution B2 HCl + CaCO3 CaCl2+ H2 OSuppose CaCO3reacted with mL of HCl. What is the molarity of the HCl? g CaCO3x 1 mole/100g = mole CaCO3x 2 mole HCl/1 mole CaCO3= mole HClMolarity = moles / VL= mole HCl / ( mL x 1L/1000mL) = M HCl moles of substance BVolume of substance B16 moles of substance AMoles of substance BMole ratioMass of substance AMolar mass of substance AMass of substance BMolar mass of substance BVolume of substance AVolume of substance BMolarity of solution AMolarity of solution BAl(OH)3+ 3 HCl AlCl3+ 3H2 OHow many grams of Al(OH)3will react with 100 mL of M HCl?

7 CHM 1010 SinexChemical CalculationsPractice, practice, (l) + 3C (s) 4Al (l) + 3CO2 (g)For a kg of Al2O3, how much aluminum metal, in grams, can be produced?How many atoms of carbon are consumed for the problem above?18CH3 COOH + NaOH CH3 COONa + H2 OHow many grams of CH3 COOH are needed to react with mL of M NaOH?HX + NaOH NaX + H2 OIf HX react with mL of M NaOH, what is the molar mass of HX?What is element X?CHM 1010 SinexChemical CalculationsPractice, practice, if two reagents are added, how much product do you get?2Na + Cl2 2 NaClSuppose 10 g Na and 10 g Cl2are mixed together. How much NaCl can be produced?First find the moles of each reactant:10 g Cl2x 1 g = mole Cl210 g Na x 1 g = mole NaFind the moles of NaCl produced for each mole Cl2x 2 mole NaCl/1 mole Cl2= mole mole Na x 2 mole NaCl/2 mole Na = mole BrCl This is what can be produced!

8 Cl2is limiting + 1Cl220A chemical analysis problemA chemist decides to check the molarity of H2SO4in her car battery. A mL sample is reacted with mL of NaOH. What is the molarity of H2SO4?H2SO4+ 2 NaOH Na2SO4+ 2H2 OCHM 1010 SinexChemical CalculationsPractice, practice, to problems by slide number:4 mole NaHCO3; x 1023molecules CO26 M KCl; mole NaOH12 61g CO216 Al(OH)317 x 102g Al; x 1024atoms C18 CH3 COOH; MM = g/mole; X = F20 H2SO4