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However, the measurement of the volume of hydrogen gas was inconsistent because magnesium was still in the process of reacting due to missed opportunity inability to obtain percentage error and theoretical values were not calculated this can affect the overall consistency of the results.

However, the measurement of the volume of hydrogen gas was inconsistent because magnesium was still in the process of reacting. This was due to a missed opportunity to obtain the percentage error, and theoretical values were not calculated. This can affect the overall consistency of the results.

To fix the grammar in the provided sentence, you can make the following revisions:

"However, the measurement of the volume of hydrogen gas was inconsistent because magnesium was still in the process of reacting. This inconsistency arose due to the missed opportunity to obtain a percentage error and the failure to calculate theoretical values. These factors can greatly affect the overall consistency of the results."