化学计算（Chemical calculation）
The calculation method of chemical
Two thousand and eleven point seven
First, the average relative atomic mass method
1, the hydrochloric acid mixture of 2.5G and metal enough, release hydrogen in the standard condition volume is 2.24L, which may be ()
A B, zinc and iron, magnesium and zinc, aluminum and magnesium C D, copper and iron.
2, by two kinds of mixtures composed of 10G zinc, iron and magnesium and aluminum in the four kinds of metals, and hydrochloric acid enough, release hydrogen at standard conditions of volume 11.2L, is in the mixture must contain metal (is)
A, B, C, zinc iron, aluminum magnesium D
3, Mg Al Fe Cu of four kinds of metal, if the 22 mixed, from a mixture of 26 g, with plenty of dilute sulfuric
acid reaction, produced under the standard condition of hydrogen volume is 11.2L, the mixture may have up to (for).
A, 2 B, 3 C, 4 D, 5
Two, difference method
4, take a certain amount of copper oxide powder with 0.5L of dilute sulfuric acid after full reaction, a 50 g bar into the above solution, when the iron quality does not change, the iron weight gain of 0.24 g, and collected 224mL standard condition for hydrogen, copper oxide, the amount of substance.
5, a sufficient amount of iron into the mixed solution of 200mL sulfuric acid and copper sulfate, after full reaction to produce hydrogen, iron 1.12L, reduce the quality of 1.2 g, the concentration of sulfuric acid and copper sulfate for raw material in solution. (assuming the reaction solution before and after constant volume)
6, the 5.6LCO2 gas slowly through a certain amount of Na2O2 solid, 3.36L (gas gas were measured in the standard condition), quality of the gas is (g).
A, 3.8 B, 5.4 C, 4.8 D, 6.6
7, the amount of substance N2, O2, CO2 mixed gas by Na2O2 solid, volume to volume 8 / 9 (Tong Wen Press), N2, O2, CO2 and mixed in gas volume ratio ()
A, 3:4:1 B, 3:3:2 C, 6:7:3 D, 6:9:10
Three, conservation law
8, the iron powder, Aluminum Alloy Ag dissolved in sufficient dilute hydrochloric acid with excess sodium hydroxide solution, filtered precipitation, washing, drying, burning, quality red brown powder is AG, the mass fraction of iron alloy (for)
A, 70% B, 52.4% C, 47.6% D, 30%
9, 1 gMgCl 2 - nH 2O crystal, soluble in water, add enough AgNO 3 solution, 1.41g AgCl, n (value)
reaction mass
A, 2 B, 4 C, 6 D, 8
20mL 10, a metal chloride solution R, concentration of
0.05mol/L, it can be with 20mL, 0.15 mol/L AgNO 3 solution reaction, the chemical formula (chloride)
A, RCl B, RCl 2 C, RCl 3, D RCl4
11, NaCl, MgCl and other completely precipitated substance concentration of 2 AlCl and 3 Cl- in the solution, the amount of consumption of substances such as the concentration of AgNO 3 solution volume ratio is 3:2:1, the volume ratio of solution to ()
A, 1:1:1 B, 3:2:1 C, 6:3:2 D, 9:3:1
12, Na2CO3 10H2O and NaHCO3 11.94g mixture, soluble in water into 200 mL solution, the concentration of Na+ was measured to be 0.5 mol/L. if 11.94g of the mixture is heated to the quality does not change, the quality of the solid (g).
A, 5.1 B, 5.3 C, 9 D, 11
13, 2.64g Mg, Cu mixture consisting of dilute nitric acid to put a certain amount of reaction, the reduction product NO gas
0.896L collected solid completely dissolved when (standard condition), to add 60 mL NaOH 2 mol/L solution of the solution after reaction, metal ions to complete precipitation, precipitation is the formation of quality (G)
A, 4.32 B, 4.68 C, 5.36 D, 6.38
14, Mg, Al mixed powder of 10.2g, it will be dissolved in 500 mL4mol/L hydrochloric acid, if the precipitation quality reaches the maximum value, will be added to the 2mol/LNaOH solution volume (mL).
A, 1000 B, 500 C, 100 D, 1500
15, Al, CuO, Fe2O3 mixture consisting of 10G, mL in 500 a concentration of HCl, the mixture is completely dissolved, when adding 250 mL NaOH solution, 2mol/L, get the most precipitation, the concentration of hydrochloric acid (for)
Mol/L.
A, 1 B, 0.5 C, 2 D, 3
16, Na2O2, HCl, Al2O3 three kinds of substances in the water after complete reaction, the solution containing only Na+, H+, Cl-, OH-; and the solution is neutral, Na2O2, HCl, Al2O3 molar ratio (for)
A, 3:2:1 B, 2:4:1 C, 2:3:1 D, 4:2:1
17, to join the AlCl3 a mL solution, sodium 0.25 mol/L, after
the complete reaction mixture just forms NaCl and NaAlO2, while adding sodium metal material (mol) was.
A, 2.5A, 5A * 10-4 B * 10-4 C, 7.5A D, a * 10-3 * 10-4
18, the aluminum powder and Fe3O4 powders with thermite, divided into two equal parts, a high temperature in exactly the reaction of dilute hydrochloric acid reaction and then will generate enough; after full reaction, a direct solution to add enough NaOH, gas generation and two case of molar ratio (for).
A, 1:1 B, 9:8 C, 3:4 D, 4:3
19, to a certain amount of Cu and Fe2O3 with the mixture of 300 mL and 1 mol/L HCl solution, just to make the mixture completely dissolved, no red solution after adding KSCN solution income. If the mixture with an excess of CO in high temperature reduction under the same quality,
The quality is reduced (g) solid.
A, 6.4 B, 4.8 C, 2.4 D, 1.6
20, an iron oxide with 7 mol/L hydrochloric acid 100 mL under certain conditions is completely dissolved, the solution into the 0.56L standard under the condition of chlorine, just make the Fe2+ completely into Fe3+ solution, then the oxide chemical formula can be expressed as ().
A, FeO B, Fe3O4 C, Fe4O5 D, Fe5O7

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