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Thanks to Amadeus Avagadro we know the volume of a gas is directly proportional to the number of mol

# Thanks to Amadeus Avagadro we know the volume of a gas is directly proportional to the number of mol

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Thanks to Amadeus Avagadro we know the volume of a gas is directly proportional to the  number of molecules in the gas (or the number of moles). Thus to get the correct  stoichiometry when working with gases we can simply adjust the volume of each gas to  match the stoichiometry of the reaction (as I did with the second balloon). Generally,  however, equal volumes of different compounds in the solid and liquid state do not  necessarily contain the same number of molecules, atoms or moles. When working with solids or liquids it would be nice to have a scale or device that easily  measures the number of moles. In practice, however, the starting point for chemists is the  mass of the reactants, not the moles. Therefore we need to convert between mass (easily  measured) and moles (not so easily measured). Let's look at a few examples.

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Unformatted text preview: What mass of oxygen will react with 96.1 grams of propane? First, write the balanced reaction: C 3 H 3(g) + 5 O 2(g) → 3 CO 2(g) + 4 H 2 O (g) Second, convert the mass to moles. Note that the molecular weight of propane is 44.1 g/mole. Baking soda ( NaHCO 3 ) is used as an antacid. It neutralize excess HCl secreted by the stomach. NaHCO 3 + HCl (aq) → NaCl (aq) + H 2 O (l) + CO 2(aq) How many moles of HCl are neutralized per gram of NaHCO 3 ? We set this problem up similar to the previous one: Now try this one at home. Milk of Magnesia ( Mg(OH) 2 ) is also an antacid, and the chemical reaction is Mg(OH) 2 (s) + 2HCl (aq) → 2 H 2 O (l) + MgCl 2(aq) Try this one on your own: Which neutralizes more HCl per gram, NaHCO 3 or Mg(OH) 2 ?...
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