Which valences can manganese exhibit? Type out the representation,

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• 1. What is the number of the outermost electrons in manganese? The valence of a chemical change What is the outermost electron number of manganese? The valence of a chemical change
• 2. After a bottle of 14% potassium hydroxide solution was heated and evaporated off 100 g of water,80 mL of 28% potassium hydroxide solution was obtained at a concentration of () A.5 mol/L B.6 mol/L C.6.25mol /L D.6.5mol/L
• 3. After evaporating 100 g of water from 14% KOH solution,80 mL of 28% KOH solution was obtained, and the mass concentration of this solution was ______.
• 4. 14% Of the koH solution is heated to evaporate 100 g to 80 ml of the 28% of the koH solution. What is the mass concentration of this 80 ml solution? 14% Of the koH solution is heated and evaporated 100 g to 80 ml of the 28% of the koH solution. What is the mass concentration of this 80 ml solution?
• 5. A bottle of 14% KOH solution was heated and evaporated off 100 g of water to 80 mL of 28% KOH solution with an amount-concentration of () A.5 mol•L-1 B.6 mol•L-1 C.6.25 mol • L-1 D.6.75 mol • L-1 A bottle of 14% KOH solution was heated and evaporated off 100 g of water to 80 mL of 28% KOH solution in an amount of () A.5 mol•L-1 B.6 mol•L-1 C.6.25 mol • L-1 D.6.75 mol • L-1
• 6. After a bottle of 14% potassium hydroxide solution was heated and evaporated off 100 g of water,80 mL of 28% potassium hydroxide solution was obtained at a concentration of () A.5 mol/L B.6 mol/L C.6.25mol /L D.6.5mol/L
• 7. At 20.degree. C., there are two saturated sodium chloride solutions, also 200 g and 100 g in mass, each evaporating 11 g of water at 20.degree. C. The precipitated crystals are two g of A and B, then A and B (greater than, equal to, and less than At 20.degree. C., there are two saturated sodium chloride solutions, also 200 g and 100 g in mass, each evaporating 11 g of water at 20.degree. C., and the precipitated crystals are two g of A and B, then A and B (greater than, equal to, and less than
• 8. Solubility of sodium chloride at 20° is 36.0g/100g water. To prepare saturated solution of sodium chloride at 20°, please answer: ) How many grams of water does 18 g of sodium chloride need to be dissolved? (2) What is the maximum amount of sodium chloride that can be dissolved in 150g water? (3) How much g of sodium chloride and water is required to prepare 500 g of saturated sodium chloride solution? (To the nearest 1g) I'm gon na take a step.- Give it to me by 10:00 tonight. It's overdue.
• 9. At 60 degrees Celsius, the solubility of sodium chloride is 37 g, and 100 g of a saturated solution of sodium chloride at 60 degrees Celsius is now heated to evaporate 20 g of water How many grams of crystal can be precipitated _
• 10. When the solubility of sodium chloride is 36G at 20°C, what is the mass fraction of fraction of saturated solution of 100G sodium chloride at this temperature? When the solubility of sodium chloride is 36G at 20°C, what is the solute mass fraction of saturated solution of 100G sodium chloride at this temperature?
• 11. What is the valence of manganese?
• 12. The valence of chlorine element in ClO2 is several The valence of chlorine element in ClO2 is
• 13. The valence of chlorine element in ClO2 is:+4(valence)? Or +4?
• 14. At 20°C, the salt solution with a solute content of 5%(mass fraction) of 100 g is treated as follows, and the solution in which the solute content increases every time is fully dissolved 1) After evaporating 10g of water, the mass fraction of solute is? 2) After adding 10g NaCl, the mass fraction of solute is? At 20°C, the salt solution with 100g solute content of 5% is treated as follows, and the solution with increasing solute content in the solution is completely dissolved 1) After evaporating 10g of water, the mass fraction of solute is? 2) After adding 10g NaCl, the mass fraction of solute is?
• 15. Sodium chloride has a solubility of 36 g at 20°C, at which the mass fraction of solute in the sodium chloride solution can not be 20%26.4%25%30% Sodium chloride has a solubility of 36 grams at 20 degrees Celsius, at which the mass fraction of solute in the sodium chloride solution is unlikely to be 20%26.4%25%30%
• 16. The solubility of sodium chloride at 20.d egree. C. is known to be 36 g/100 g of water, and the mass value of sodium chloride in saturated sodium chloride solution at 20.d egree. C. is A 200 times 36 divided by 100 B 200 times 36 divided by 100 plus 36 C 200 times 100 divided by 36 D 200 by 36 divided by 100 minus 36
• 17. At 20°C, the solubility of salt is known to be 36g. Now,50g salt is added to 50g water and fully dissolved, what is the mass fraction of solute in the solution?
• 18. Given a solubility of 36 g of sodium chloride at 20.d egree. C., the mass of sodium chloride in a saturated solution of 100 g of sodium chloride is ___ g The mass of water is __g. When the sodium chloride solid is 18g at 20°C,_g water shall be added to prepare the saturated solution.
• 19. At 20°C,100g of 10% salt solution was treated as follows to obtain the mass fraction of solute in the solution At 20°C,100 g of 10% salt solution was treated as follows: Calculate the mass fraction of the solute in the resulting solution (assuming that each No solute precipitation or residue). (1) What is the mass fraction of the solute after evaporation of 10 g of water? (2) What is the mass fraction of solute after adding 10g NaCl? (3) What is the mass fraction of solute after adding 10g NaCl and 10g water? (4) What is the mass fraction of the solute after adding 100g of 15% NaCl? (5) What is the mass fraction of the solute after adding 20 g of water? (Please write out the calculation process)
• 20. The solubility of sodium chloride is 36 g at 20°C, at which the mass fraction of solute in the sodium chloride solution is unlikely to be () A.20% B.26.5% C.25% D.30%