# Chem help: how to calculate the experimental and theoretical volume of a dry gas at STP?

In two trials 2KClO3 -> 2KCl + 3O2
with MnO4 a catalyst was heated while joined with a pneumatic trough that had 4 jars in the first and second trial filled with water. The point is to produce gas in the jars.
Trial 1:
Weight of KClO3:1.754g
Temp of water in Trough: 38.8 degrees Celsius.
weight of empty...
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In two trials 2KClO3 -> 2KCl + 3O2

with MnO4 a catalyst was heated while joined with a pneumatic trough that had 4 jars in the first and second trial filled with water. The point is to produce gas in the jars.

Trial 1:

Weight of KClO3:1.754g

Temp of water in Trough: 38.8 degrees Celsius.

weight of empty jar: 144.001g

ml of water in jar: 159.5ml

weight of contents after heating: 2.479g

3 jars empty + 1 jar filled with oxygen and ml of water left in 4th jar : 143.9 ml

Trial 2:

Weight of KClO3: 2.06g

Temp of water in Trough: 24.5 degrees Celsius.

weight of empty jar: 151.329g

ml of water in jar: 159.5ml

weight of contents after heating: 2.143g

3 jars empty + 1 jar filled with oxygen, volume of water in jar::155.9ml

atm pressure: 100.5kpa

with MnO4 a catalyst was heated while joined with a pneumatic trough that had 4 jars in the first and second trial filled with water. The point is to produce gas in the jars.

Trial 1:

Weight of KClO3:1.754g

Temp of water in Trough: 38.8 degrees Celsius.

weight of empty jar: 144.001g

ml of water in jar: 159.5ml

weight of contents after heating: 2.479g

3 jars empty + 1 jar filled with oxygen and ml of water left in 4th jar : 143.9 ml

Trial 2:

Weight of KClO3: 2.06g

Temp of water in Trough: 24.5 degrees Celsius.

weight of empty jar: 151.329g

ml of water in jar: 159.5ml

weight of contents after heating: 2.143g

3 jars empty + 1 jar filled with oxygen, volume of water in jar::155.9ml

atm pressure: 100.5kpa

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