The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressures
and temperatures. Which best describes this statement?
This is a limitation of the kinetic-molecular theory.
This is a postulate of the kinetic-molecular theory.
This describes ideal gas behavior using the kinetic-molecular theory.
This describes ideal gas behavior without the kinetic-molecular theory.

It would be true sodium reacts with water in a violent way 

Use the universal gas law formula: pv = nrt now, the key word in this problem is stp, so at stp, temperature will always be 0 degrees celsius and pressure will always be 1.0 atm or 760 torr. given something is at stp, we already know the two variables pressure and temperature. the other thing we can find with the given information is moles. to find moles, just divide grams by molar mass of the element. 16.0g / 2(16.00)g/mol = 0.5 moles plug the values in to the equation pv = nrt (1.0 atm)( x ) = (0.5 )(0+273=273k) the r value is just a constant for when we use atm, liters, moles and kelvin. i'm assuming you want your answer in liters, but if you dont just move the decimal 3 to the right in your final answer. so when plugging these numbers in to your calculator and trying to find x, you get 11.20665 liters using significant figures the answer is 11.2 liters

Moles = mass/molar mass by this formula 458/207+32 you should get your answer the ans. is 1.916 mol to 4 sig. fig.