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Just as using average atomic mass is much more efficient than measuring the The very striking differences between iron and helium, clearly, must come from something other than the molar mass differential between VOLUME 1: REAL-LIFE CHEMISTRY S C I E N C E O F E V E RY DAY T H I N G S them. Of course, a mole of iron contains the same number of atoms as a mole of helium, but this says nothing about the relative density of the two substances. In terms of volume—that is, the amount of space that something occupies—the difference is much more striking: the volume of a mole of helium is about 43,000 times as large as that of a mole of iron.
LIQUID AND GAS VOLUME. ” Just as “a dozen” can refer to twelve cakes or twelve chickens, so “mole” always describes the same number of molecules. Just as one liter of water, or one liter of mercury, has a certain mass, a mole of any given substance has its own particular mass, Measuring liquid volumes is even easier than for solids, given the fact that liquids have no definite shape, and will simply take the shape of the container in which they are placed. Gases are similar to liquids in the sense that they expand to fit their container; however, measurement of gas volume is a more involved process than that used to measure either liquids or solids, because gases are S C I E N C E O F E V E RY DAY T H I N G S VOLUME 1: REAL-LIFE CHEMISTRY 27 Mass, Density, and Volume highly responsive to changes in temperature and pressure.
01 amu. 01 VOLUME 1: REAL-LIFE CHEMISTRY 25 Mass, Density, and Volume Earth (to same scale) ALTHOUGH SATURN IS MUCH LARGER THAN EARTH, IT IS MUCH LESS DENSE. amu is still reliable. 0 amu Hassium (Hs): [265 amu] The figure for hassium, with an atomic number of 108, is given in brackets because this number is the mass for the longest-lived isotope. 0153 amu. 304 amu. 26 atomic mass of oxygen. 304, weighs much more than hydrogen. Molar Mass It is often important for a chemist to know exactly how many atoms are in a given sample, particularly in the case of a chemical reaction between two or more samples.
All About Ocean Life
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