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DH_f=80cal/g       DH_v=540cal/g     s_l=1.00cal/g°C     s_s=.50cal/g°C      s_g=.50cal/g°C

Q=smDT     Q=DHm

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1 Which of the following has a larger boiling point? Explain why.

HOCH₃ , HOCH₂CH₂CH₃, or HOCH₂CH₂OH

HOCH₂CH₂OH since it has more possibilities for hydrogen bonding than either of the other compounds and has a larger molecular weight.

2 Make a sketch clearly showing hydrogen bonding for a compound of your choice.

3 What is the formula for the anhydrides of the following compounds?

a) H₂SO₄           SO₃                                 b) H₃PO₄          P₂O₅

c) Ca(OH)₂       CaO                      d) HNO₃          N₂O₅

4 How much heat is required to raise the temperature of 10.0 g of water from -10.0°C to 90.0°C

q₁=s_icemDT = .5cal/gºCx10gx10ºC

q₂=DH_fm=80cal/g x 10g

q₃=s_liquidmDT = 1cal/gºCx10gx90ºC

5 What is the percent water in BaCl₂•2H₂O?