A180 ml volume of gas is measured at 87 degrees celsius. if the pressure remains unchanged, what will be the volume of the gas at standard temperature

According to Charles's Law, for a given mass of an ideal gas at constant pressure, the volume is directly proportional to its absolute temperature assuming in a closed system.  Mathematical equation is : V1/T1=V2/T2.  87 degrees Celsius equals 87+273.15=360.15 k, and standard temperature is 273.15 k.   So, 180/360.15 = V2/273.15, V2=180*273.15/360.15 = 136.52 mL, which is the volume of gas at standard temperature.