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STP and Molar Volume

STP and Molar Volume. Standard Temperature and Pressure (STP) P = 1.000 atmosphere or 760 mm Hg or 760 torr T = 0 ° C = 273.15 K If we had 1.000 mol of gas at 1.000 atm of pressure at 0 ° C, what would be the volume? PV = nRT; rearrange V = nRT/P

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STP and Molar Volume

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  1. STP and Molar Volume • Standard Temperature and Pressure (STP) P = 1.000 atmosphere or 760 mm Hg or 760 torr T = 0 °C = 273.15 K • If we had 1.000 mol of gas at 1.000 atm of pressure at 0°C, what would be the volume? PV = nRT; rearrange V = nRT/P V = (1.000 mol)(0.0821 L atm/mol K)(273.15 K)/(1.000 atm) V = 22.41 L • 1 mole of any gas = 22.41 L at STP • 22.41 L is called molar volume of a gas • volume of a gas occupied by 1 mole of a gas at STP memorize memorize

  2. Practice: Using STP Conditions • What volume will 1.6 moles of O2 occupy at STP? (Ans: 36 L) Use the unit factor: 1 mol O2 = 22.4 L (valid only at STP) 2. 175 mL of hydrogen was collected at 25 °C and 745 mm Hg. Calculate the volume of hydrogen in mL at STP.

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