# How to determine the weight of the solution ?

You will need:
• Periodic Table
• Measuring capacity
# 1

In practice, it is difficult to understand how to determine the weight of the solution.If it is not too much and not too little, it is possible to determine its mass, just weighed on the scales.If it is impossible to determine the mass so that it can be calculated through other values.For example, to calculate the mass density sufficient to know (typically given in Tables * at standard conditions), and capacity.The volume can be measured by different measuring cup.

# 2

most frequent problem in the school course of chemistry, it is how to calculate the relative molecular mass.Initially, you must determine the molecular formula of the desired substance.For example, it is water (H2O).Further down the periodic table to find the mass of atoms of each element included in the molecule, and sum them.In this case, 1 * 2 (H2-2 hydrogen atom) + 16 (O-atom of oxygen) = 18

# 3

when mixing several components it is important to know how to

determine the weight of the mixture.Initially, you need to know a lot of the components in the mixture.In many cases, their sum is enough mechanically.But if the components can start a chemical reaction during mixing, or they are at different temperatures, and some of them can achieve mixing with the boiling temperature and partly evaporate need to make corrections for these factors.

# 4

Molekuly- tiny particles that retain the properties of matter.It is interesting to learn how to determine the mass of the molecule.First, we need to find the desired relative molecular weight agents (described above).In fact, it is the mass of the molecule, but the unit a.e. m. In order to transfer them to kilograms, multiply by the number of Avogadro (6.2 x 10 (-23)).That is, the molecular weight is usually in the region of 0.1 kg.

# 5

Gas substance having no constant density (varies with temperature and pressure).Therefore, the task is to determine the mass of gas, almost difficult to be solved.But there is a simple theoretical method.You need to know the relative molecular weight (described above) and the volume (in liters, can be calculated from the volume of the vessel that holds gas).These two values ​​to be multiplied and multiplied by the molar gas density at standard conditions * 2.4 L / mol.