Avogadro2 vs avogadro2/28/2024 ![]() This is definitely not the case with gases, whose molar volumes must be calculated for a specific temperature and pressure. For solids and liquids, these variables ordinarily have little practical effect, so the values quoted for 1 atm pressure and 25☌ are generally useful over a fairly wide range of conditions. Molar volume depends on the density of a substance and, like density, varies with temperature owing to thermal expansion, and also with the pressure. This is the volume occupied by one mole of a pure substance. Is this answer reasonable? (Always be suspicious of huge-number answers!) Yes, because we would expect to have huge numbers of atoms in any observable quantity of a substance. Solution: Each gram of chlorophyll contains 0.0268 g of Mg, atomic weight 24.3. How many atoms of Mg will there be in 1.00 g of chlorophyll? The plant photosynthetic pigment chlorophyll contains 2.68 percent magnesium by weight. Problem Example 6: Magnesium in Chlorophyll
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