If the atomic mass of gold is 196.9665 u, how many grams of gold are in 0.150 mol au

1 mol Au 196.9665 g
0.150 mol Au ?

0.150 x 196.9665 / 1

= 29.54 g

hope this helps!

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.