Yes,it's true ok? So how have you been doing
So base on your question that as if the vapors volume were to incorrectly recorded as 125ml, the effect of the error to calculate the molar mass is the same as the error in measuring the volume of the vapor. I hope you are satisfied with my answer and feel free to ask for more
Answer:
if one bulb burns out the other bulbs will also turn off because they are connected to each other.