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Department of Natural Sciences
CHEM101 Lab

Student Name and ID:
Mussa El-Zein 201501735
Widad El-Zein 201501737

Instructor: Dr
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STP stands for Standard Pressure and
Temperature and is: 273
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Aim: In this experiment we will calculate the molar volume of DiOxygen at STP
(Standard Temperature and Pressure) using a certain setup and procedure
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The setup was prepared before hand by our professor
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One tube, connected to a short glass tube, was connected to another
rubber stopper with another short glass tube that corked the 250ml Erlenmeyer flask
(FLASK A)
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2
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3
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05-0
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4
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5
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6
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Experimental procedure:
• When the H2O2 solution mixed with FeCl3, O2 gas was released:
2 H2O2 (aqueous) + Catalyst

2 H2O (liquid) + O2 (gas)

• The DiOxygen gas produced was released through the rubber tube into flask B through
the short (above level) glass tube
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2

Results: The volume of water emptied into the beaker is the same volume of oxygen that
was introduced in flask B
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Weight of Flask A and contents before stirring: 123
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Weight of Flask B and contents after stirring (O2 released): 123
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Weight of Oxygen evolved: 123
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21 = 0
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Volume of Oxygen (Volume of water in beaker): 97ml
5
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Temperature of Oxygen in Kelvin: 26 + 273
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15 K
7
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Vapour Pressure of water at 299
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2mmHg
9
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15 = 719
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15
V1 = 83ml = 0
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Molar Volume of Oxygen at STP: n(O2)= (123
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21)/32 = 0
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083/0
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56 L/mol
11
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56 - 22
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4 = 48
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Certain procedures and setups have to be prepared first

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