If the heat of vaporization of water is 539.5 calories per gram, how many calories of heat are needed to vaporize 3.14 kilograms of water. Express your answer in calories.

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

The element that has the greatest electronegativity is

Find the number of moles of argon in 364g of argon.