How many atoms of K are present in 195.49 grams of K? O 3.0110 x 1024
O 6.0220 x 1024
O 1.1772 x 1026
0 4.5797 x 1027

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.