What mass will 2.5 L of chlorine gas be at STP?

m = 7.7 g Cl2

Explanation: To find mass of chlorine gas we will first derive the ideal gas law formula and find first the number of moles of Cl2. At STP, Pressure is equal to 1 atm and temperature is 273 K.

n= PV /RT

= 1 atm ( 2.5 L) /0.0821 L.atm / mole.K ( 273 K)

= 0.11 mole Cl2

Convert moles of Cl2 to grams using the molar mass of Cl2 which is 70 g Cl2.

0.11 mole Cl2 x 70 g Cl2 / 1 mole Cl2

= 7.7 g Cl2

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yes

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