Presentase na dalam na2co3.10h2o adalah (mr h=1 , c=12,o=16, na=23)

If Ar Na = 23 is known; C = 12; O = 16 and H = 1 gr / mol then the relative molecular mass of Na2CO310H2O is:

Mr = 2Ar Na + Ar C + 13Ar O + 20Ar H

Mr = 2 (23) + 12 + 13 (16) + 20 (1)

Mr = 286 gr / mol

Before learning about the basic principles of chemistry, we must understand the basics of chemical calculations. Each chemical element / compound has a level expressed in mol (n). Moles can be calculated in standard conditions (STP) which is at a temperature of 25 C and a pressure of 1 atm.

The value of mole (n) can be calculated based on the mass of the substance (gr), the volume of the substance (V) and the number of particles (N) contained in the substance. The relationship between the number of moles, the mass of the substance, the volume of matter and the number of particles is expressed mathematically in the following equation:

n = gr / Ar = V / 22.4 liters = N / Na

where Na is an avogadro number whose value has been determined based on Avogadro's experiment of 6.02 × 10² 10 particles / mol. The volume of substances in standard conditions is stated at 22.4 liters / mol.

The concentration of a substance can also be expressed by molarity (M). Molarity is a unit that states the number of moles contained in each liter of solution. Mathematically molarity (M) can be expressed by the equation:

M = n / V

where n is the number of moles and V is the volume of solution.

In addition to moles and molar, the level of a substance in solution can also be expressed by% both mass and volume. the level of substance A in solution B can be stated as follows:

% mass = [mA / (mA + mB)] x 100%

and

% volume = [vA / (vA + vB)] x 100%

where mA da mB is the mass of substance A and substance B. while vA and vB are the volume of substance A and substance B.

The concentration of the solution can also be expressed by molality (M). Molality is expressed as units of mol / kg. Molality (M) is mathematically formulated with:

M = (gr / Mm) (1000 / p)

where gr is the mass of the solute (g), Mm is the molar mass of the substance (gr / mol), and p is the mass of the solvent (gr).

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.