you need
• - periodic table.
Guide
1
Mole - a number substance containing a certain number of particles (atoms, ions, molecules) value of the Avogadro constant.Na = 6.02 x 10 to 23 degrees.The very same Avogadro constant is defined as the number of atoms contained in the twelve grams of carbon.
2
On this basis, we can calculate how number of moles contained in the material, if you know number of atoms or molecules in it.This value is divided by the Avogadro number.For example, if the sample has a 12.04 x 10 to 23 degrees molecules, number of moles is the amount of 2, expressed like moles n.
3
molar mass of a substance (M) - an array that has one mole of the substanc
e.Get the data you can, using the periodic table.You need to add molar mass of each element, taking into account existing rates.For example, methane CH4 molar mass M is equal to 4 x 12 + 1 = 16. This value is measured in grams, divided by the moles .
4
To calculate mole , you need to know in addition to the molar mass and the mass of the sample.Further calculations are carried out according to the formula n = m / M, where m - mass of matter.
5
If you know the concentration and volume of the solution, you can find a number of mole substances on the basis of these data.To do this, you need to multiply the volume and concentration.The formula is as follows: n = cx V.
6
If you want to calculate the number of moles contained in a gas under normal conditions (pressure of Pa 101 325, and a temperature of 273 K), you shouldknow only the gas volume.The formula in this case is as follows: n = V / Vm.Vm - is the molar volume of an ideal gas constant under normal conditions.It is equal to the molar volume of 22.4 liters / mole .Also, it is often measured in cubic decimetres divided by mole .