What is the new volume of a balloon originally at 755 torr and 5.00 l is placed in a container in which the pressure is increased to 1.25 atm?

Boyle's law states that pressure is inversely proportional to volume at constant temperature 
PV = k
where P - pressure , V -volume and k - constant 
P1V1 = P2V2
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation 
P1 - 755 torr x 0.00131 atm/torr  = 0.989 atm
substituting the values in the equation 
0.989 atm x 5.00 L = 1.25 atm x V 
V = 3.96 L
new volume is 3.96 L

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.