A pycnometer (see Exercise 78) weighs 25.60 g empty and 35.55 g when filled with water at 20 °C. The density of water at 20 °C is 0.9982 g/mL.  When 10.20 g of lead is placed in the pycnometer and the pycnometer is again filled with water at 20 °C, the total mass is 44.83 g. What is the density of the lead in grams per cubic centimeter?

Exercise 78

The simple device pictured here, a pycnometer, is used for precise density determinations. From the data presented, together with the fact that the density of water at 20 °C is 0.99821 g/mL,  determine the density of methanol, in grams per milliliter. 

 

Transcribed Image Text:

Empty 25.601 g Filled with water at 20 °C: 35.552 g Filled with methanol at 20 °C: 33.490 g