Step-by-step explanation:
P1V1=P2V2 is the formula for Boyle's law where, P is the pressure and V is the volume. V1/T1 = V1/T1 is the formula for Charles law where, V is volume and T is temperature. STP means Standard Temperature and Pressure, standard temperature is 273k and standard pressure is 1.01×10^5 or 760mmHg, the standard volume is 22.4dm^3. pv=nrt is the formula for Ideal gas equation where p is pressure
v is volume
n is number of moles
r is 0.082 atm
t is absolute temperature in kelvin