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Since you don't specify the conditions, I will use the current STP. At STP of 0oC (273.15 K for gases) and 100 kPa, the molar volume of a gas is 22.711 L/mol.
4.50 mol Cl2 x 22.711 L/mol = 102 L Cl2, rounded to three significant figures.
Just in case your teacher is using the older version of STP of 0oC (273.15 K for gases), and 1 atm, the molar volume of a gas would be 22.414 L/mol.
4.50 mol Cl2 x 22.414 L/mol = 101 L Cl2, rounded to three significant figures.
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