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The valence of chlorine element in ClO2 is:+4(valence)? Or +4?
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The valence of chlorine element in chlorine dioxide is?
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- 1. The valence of chlorine element in ClO2 is several The valence of chlorine element in ClO2 is
- 2. What is the valence of manganese?
- 3. Which valences can manganese exhibit? Type out the representation,
- 4. 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
- 5. 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
- 6. 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 ______.
- 7. 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?
- 8. 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
- 9. 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
- 10. 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
- 11. 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?
- 12. 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%
- 13. 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
- 14. 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?
- 15. 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.
- 16. 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)
- 17. 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%
- 18. At 10°C, the solubility of potassium chloride is 31 g/100 g of water. The existing solution at 10°C is 393 g, in which 83 g of potassium chloride has been dissolved. How many grams of potassium chloride need to be added to form a saturated solution At 10°C, the solubility of potassium chloride is 31 g/100 g of water. The existing solution at 10°C is 393 g, in which 83 g of potassium chloride has been dissolved. How many g of potassium chloride need to be added to form a saturated solution
- 19. At 80°C, the solubility of potassium chloride was 51 grams. At this temperature, the potassium chloride solution was 240 grams. To form a saturated solution,51 grams of potassium chloride needed to be added. Senior, please help! At 80°C, the solubility of potassium chloride is 51 g. At this temperature, the potassium chloride solution is 240 g. To make a saturated solution,51 g of potassium chloride shall be added. How much g of potassium chloride is contained in the original solution? Senior, please help! At 80°C, the solubility of potassium chloride is 51 g. At this temperature, the potassium chloride solution is 240 g. To make a saturated solution,51 g of potassium chloride should be added. Senior, please help!
- 20. Solubility curve of potassium chloride can be found at 25°C 128? No, I thought it was 20,30 degrees,34,37