The three naturally occurring isotopes of potassium are 39K ; 40K ; and 41K .The percent natural abundances of 39K and 41K are 93.2581% and 6.7302% respectively. What is the natural abundance of 40K ?

The density of the solid phase of a substance is 0.90 g/cm3 and the density of the liquid phase is 1.0 g/cm3. a large increase in pressure will a. lower the freezing point b. raise the freezing point c. lower the boiling point d. raise the triple point e. lower the triple point