Base your answers to questions 51 through 53 on
the information below and on your knowledge of chemistry.
51 Based on Table H,
state the vapor pressure of ethanol at 75°C. 
|Answer-->Anything from 84 to 87 kPa
52 Show a numerical
setup for calculating the percent composition by mass of silicon in
|Answer-->(28.1/60.1) x 100%
53 Explain, in terms of
element classification, why K2O is an ionic compound.