is there any gramar errors

However, the volume of hydrogen gas measured was inconsistent since the reaction was ended, before limiting reagent magnesium dissolve fully, resulting in a missed opportunity, inability to obtain percentage error and theoretical values were not calculated; this can affect the overall consistency. Furthermore, neither of the concentration had clear outliers or averages, thus additional trials were required to overcome this constraint.

No, there are no grammar errors in this sentence. However, there are some punctuation and structure issues that can be improved:

However, the volume of hydrogen gas measured was inconsistent since the reaction was ended before the limiting reagent magnesium dissolved fully. This resulted in a missed opportunity and an inability to obtain percentage error and calculate theoretical values. These factors can affect the overall consistency. Furthermore, neither of the concentrations had clear outliers or averages, thus additional trials were required to overcome this constraint.

Yes, there are a few grammar errors in the given text. Here is the corrected version:

However, the volume of hydrogen gas measured was inconsistent since the reaction was ended before the limiting reagent magnesium fully dissolved, resulting in a missed opportunity. The inability to obtain percentage error and calculate theoretical values can affect the overall consistency. Furthermore, neither of the concentrations had clear outliers or averages, thus additional trials were required to overcome this constraint.