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superhelp101

  • one year ago

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  1. superhelp101
    • one year ago
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    I have 3 questions that I just wanted to make sure on.

  2. superhelp101
    • one year ago
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    How many milliliters of a 1.25 molar hydrochloric acid (HCl) solution would be needed to react completely with 60.0 grams of calcium metal? Ca (s) + 2HCl (aq) yields CaCl2 (aq) + H2 (g) (1 point) 1200 ml I picked this one 2400 ml 3750 ml 9600 ml A student dissolves 4.5 g of sodium chloride (NaCl) into 75 g of water (H2O). Which of the following statements is correct regarding the resulting solution when it is compared to the pure solvent? (1 point) Both the vapor pressure and the boiling point will increase. The boiling temperature and the freezing temperature will decrease. The freezing temperature will increase and the vapor pressure will decrease. The vapor pressure will decrease and the boiling temperature will increase. This one? When dissolved in 1000 g of water, which chemical compound will produce a solution with the greatest freezing point depression? (1 point) 5.0 g of sodium chloride (NaCl) 9.2 g of potassium chloride (KCl) 11 g of calcium fluoride (CaF2) This one? 20 g of glucose (C6H12O6) I'm not 100% sure on what i picked :/

  3. superhelp101
    • one year ago
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    @sweetburger

  4. sweetburger
    • one year ago
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    so 60g of Ca is like 1.5moles so were probably going to need about 3 moles of HCl due to the 1:2 ratio so saying that we need 3 moles of HCl we can say that 3molesHCl/1.25m/L = 2.4L or 2400ml

  5. superhelp101
    • one year ago
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    oh oops I made a silly error on that one

  6. Melodious
    • one year ago
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    hey

  7. Melodious
    • one year ago
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    teehee

  8. superhelp101
    • one year ago
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    :)

  9. sweetburger
    • one year ago
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    For the next question adding salt would increase the boiling point above 100C temperature lower the vapor pressure and lower the freezing point temperature below 0C.

  10. Melodious
    • one year ago
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    @superhelp101 is it me?

  11. superhelp101
    • one year ago
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    so the last option is correct

  12. sweetburger
    • one year ago
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    Yes i believe so @superhelp101

  13. superhelp101
    • one year ago
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    great! @sweetburger

  14. vera_ewing
    • one year ago
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    Nice work, @sweetburger ! :)

  15. Melodious
    • one year ago
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    vera_ you got 99 points?

  16. sweetburger
    • one year ago
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    For the last question you would have to find the amount in moles of each substance and then recognize the van hofft factor which would become like a coefficient increasing the freezing point depression

  17. Melodious
    • one year ago
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    give me a medal pls

  18. sweetburger
    • one year ago
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    so we have .08moles of NaCl so .08x2 we have .12moles of KCl so .12x2 we have .14moles of CaF2 so 3x.14 and we have .11moles of C6H12O6 so .11x1. We dont even have to multiply them out and we know that .14x3moles of CaF2 will be the largest value. Any of the values found above would be multiplied times a constant of a specific solvent and would give a temperature change.

  19. sweetburger
    • one year ago
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    So ya your choice was correct.

  20. superhelp101
    • one year ago
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    yayaya :) thanks bunches!

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