Consider the ideal gas law equation used to calculate the moles of H_2 Referring

Question

Consider the ideal gas law equation used to calculate the moles of H_2 Referring back to this equation, explain what effect (increase, decrease, no change) the following procedural errors have on the value of n (moles of hydrogen gas): The Mg did not react completely because a small piece floated out of the tube. The pressure of the hydrogen gas was recorded without subtracting the vapor pressure of water. Some of the water in the tube was allowed to leak out through the hole in the stopper before measuring the volume. The pressure was recorded based on the room temperature only, rather than averaging the three different temperatures.

Explanation / Answer

For the given reaction,

a. If not al Mg has reacted, moles of H2 produced would be lower.

b. If pressure of hydrogen gas was recorded subtracting vapor pressure of water, no change in moles of H2 has will be seen.

c. If some water is leaked out, the moles of H2 gas would be lower than actual value,

d. If pressure was recorded at room temperature and not averaged out at different temperatures, the moles of H2 gas would be higher than actual value.

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