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Chemical molar quantities

Chemical molar quantities

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ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY

Caption

Chemical molar quantities. The different amount of each chemical represents a quantity known as the mole. One mole of any sample contains the same number of molecules or atoms. The weight (shown in grams) of each molar sample is determined by the weight of the molecules (the molecular weight) and is calculated from the weights of the atoms in the molecule. Three of the chemicals are hydrated with water (H2O). The chemical formulae are, clockwise from lower left: NaCl, FeCl3.6(H2O), CuSO4.5(H2O), KI, Co(NO3)2.6(H2O) and KMnO4. The heaviest atom here is iodine (I), 8 times heavier than oxygen (O). The transition metal compounds are coloured.

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