A pair of students found the temperature of 100. g of water to be 25.8°C. They t

Question

A pair of students found the temperature of 100. g of water to be 25.8°C. They then dissolved 7.32 g of AgNO3 in the water. When the salt had dissolved, the temperature of the water was 23.5°C.

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The temperature change would be twice as large.The temperature change would be three times as large.    The temperature change would be one-half as large.The temperature change would be one-third as large.The temperature change would be four times larger.The temperature change would be the same.

Explanation / Answer

(a) T = 25.8 - 23.5 = 2.3 oC

(b) entropic

(c) absorbed energy from the dissolution process

(d) must have increased

(e)   AgNO3 (s) + H2O (l) --------------------> AgNO3 (aq)

(f) AgNO3 mass = 7.32 g

   AgNO3 molar mass = 169.87 g / mol

moles = mass / molar mass

          = 7.32 / 169.87

          = 0.0431

AgNO3 -----------------------> Ag+   + NO3-

0.0431                            0.0431     0.0431

so moles of cation 0.0431

moles of anion = 0.0431

(g) The temperature change would be one-third as large

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