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Your question seems to be incomplete or missing some critical information. To determine the volume of hydrochloric acid (HCl) gas at standard temperature and pressure (STP), we would need to know the amount of HCl in moles or grams. STP conditions are defined as a temperature of 273.15 K (0°C) and a pressure of 1 atmosphere (atm).
If you are asking how many liters of HCl gas are measured at STP for 4.00 moles of HCl, we can use the ideal gas law or apply the molar volume of a gas at STP. At STP, 1 mole of any ideal gas occupies 22.414 liters. Here's how you would calculate the volume:
Volume = moles × molar volume at STP Volume = 4.00 moles × 22.414 liters/mole Volume = 89.656 liters
Therefore, 4.00 moles of HCl gas would occupy 89.656 liters at STP.
If, however, you meant 4.00 grams or a different unit, you would first need to convert that amount to moles before applying the molar volume.