What is the value of change for the reaction N2+3H2>2NH3
Eguilibrium constant 5.0x 10^8 at 25 degrees

Can someone me with these questions plz.

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

As you watch a surfer ride a wave towards the shoreline, what is the shoreline? a) displacement reference b) reference point c) coordinate plane d) cartesian boundary