When working out the masses of solids that react with each other, we need to know their relative formula
masses
. When working out the quantities of gases in a reaction, this is not necessary. Explain why.
Answers
Explanation:
The principle that applies in this situation is that the reactions are based on the number of particles.
The number of particles are measured in moles on a larger scale or laboratory scale. Moles are the means to count the large numbers of particles by counting the groups.
For the solids, way to get the number of moles is to measure the mass, usually in grams(g) . The formula mass or simply molar mass is used to convert between grams and moles. Its units are g/mole.
For the gasses, principle is same but there are other ways also for finding the number of moles. Often the volumes are used by assuming the ideal gas behavior. At the same temperature and pressure, equal volumes of gasses contain equal numbers of moles. The mass and formula mass are not needed.
The ideal law of gas is as follows.
PV = nRT.
where, P and T are constants and they can be combined with R to form a new constant.
V = n x constant
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