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The molar mass of an element or compound to the total mass of the elements forming a mass called Mol. Molar mass; atom-grams, and molecular formula-grams-grams are used instead of the term. Each element of an atom's weight (mass NO) is. Gram quantities of each element in atomic mass as the atoms are present in equal numbers. So 12 grams of C & # 8217;, the 56 grams Fe & # 8217; well, 32 grams S & # 8217; has the same number of atoms. This number value is the 6,02.1023 one. This number switchboard is called Avogadro's Number. EXAMPLES: NA & # 8212; 1 atom-grams = 1 mole (23 grams) = 6,02.1023 2NE & # 8212; 2-g = 2 moles of atoms (2.23 = 46 grams) = 2. Avogadro's number, H2SO4 & # 8211; 1 formula-grams = 1 molecule-grams = 1 mole = 98 grams = 6,02.1023 2 H2SO4 & # 8212; 2 formula-molecular-grams switchboard grams = 2 = 2 = 2 mol = 2.98 = 196 grams. Avogadro's number PROBLEM: How many atoms are in one mole of H2SO4? SOLUTION: 1 mole H2SO4 = 2 mol H + S + 4 moles are O atoms. H2SO4 = 2 + 1 + 4 = 7 moles of atoms are. Then H2SO4 = 7. There are many atoms 6,02.1023 = 42,14.1023. PROBLEM: What is the number switchboard of atoms in one mole of NH3 molecules? SOLUTION: NH3 = 1 mol of N + 3 = 4 moles of H atoms are moles. Then NH3 = 4. There are many atoms 6,02.1023 = 24,08.1023. PROBLEM: What is the number of atoms in 1 mole of H? SOLUTION: H = H = 1 mole of atoms is 1 mole. So many atoms are H = 6,02.1023. PROBLEM: What is the number of atoms in 1 mol H2 molecule? SOLUTION: H2 = 2 moles of atoms are H = 2 mol. So there are many atoms H2 = 2 * 6,02.1023. PROBLEMS: 1 mole of H2SO4 H2SO4 molecules are too few? SOLUTION: H2SO4 H2SO4 = 1 mole = Avogadro's switchboard Number of molecules are up. Matter exchange in the reaction of the reactive elements or compounds by reaction product called self dissimilar form new substances. The reactions are shown by the equation. Left in substance, the substance shall be written on the right. EXAMPLE: Iron + Sulphur + heat & # 8212; - Demirsülf Zn + 2HCl & # 8212; & # 8212; ZnCl 2 + H 2 + H 2 CuO & # 8212; & # 8211; Cu + H2O exothermic reaction (exothermic reaction) switchboard to: the heat energy given out in the reaction is exothermic reaction is. A match, candle, such as the combustion of coal. EXAMPLE: Na2CO3 + H2SO4 & # 8212; & # 8212; - Na2SO4 + CO2 + H2O + Heat C + O2 & # 8212; & # 8211; Mg + CO2 + Heat 1 / 2O2 & # 8212; & # 8212; MgO + Heat K + 1 / 2Cl2 & # 8212; & # 8211; KCI + heat (energy) 2F + 3 / 2O2 & # 8212; & # 8212; Fe2O3 + heat H2 +1 / 2O2 & # 8212; - H2O + heat endothermic reaction (REACTION TEMPERATURE FIELD) the reaction is endothermic reaction heat energy is given. EXAMPLE: CaCO3 + heat & # 8212; & # 8211; KCIO3 CaO + CO2 + heat & # 8212; & # 8211; KCI + 3.2 O2 H2O + heat & # 8212; & # 8212; H2 +1 / 2O2 NH 4 Cl + heat & # 8212; & # 8211; NH3 + HCl reaction in the reaction switchboard products entering the conservation of mass and the mass of the amount of the products is always equal to each other. If 50 grams of substance in the product is always 50 grams. French Lavosier have found this information.
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