Ok so we had a mass determinations lab in chemistry. We were supposed to use both a triple beam balance scale and an electronic scale to precision.

We first weigh our beaker on both scales (i did it on the electronic first), then record the weight. Then we have three objects, we put the first one in the beaker and record the weight of the beaker + the object...then we subtract the beaker weight by itself - the beaker + the object to get the weight of the object by itself. Then we do this for the other two objects until we have gotten this data for all three objects...then I did the same for the triple beam balance scale...

Here are my calculations:

Calculations:

Electronic Scale:

Mass of empty beaker: 49.112g

ID number of object Mass of beaker plus object – empty beaker Mass of object itself

Transparent Cube A
65.814g – 49.112g=16.702g

Cork B
49.695g - 49.112g=0.583g

Steel Cylinder C
78.026g – 49.112g=28.914g



Triple Beam Balance Scale:

Mass of empty beaker: 49.1g

ID number of object- Mass of beaker plus object – empty beaker- Mass of object itself

Transparent Cube A
65.95g – 49.1g=16.85g

Cork B
49.85g – 49.1g=.750g

Steel Cylinder C
78.2g – 49.1g=29.1g

This is my calculations. What I need to do now is something about translating my calculations to sig figs? I think in my case it's decimal points. But I'm not sure how to translate these calculations into the right decimal points or sig figs, please help?


I'm not sure which number is the exact number to not consider but I'm assuming it's the weight of the beaker. I am led to believe I am supposed to base the final calculations on the decimal points of the initial weight of the beaker + the object

Please just tell me the final numbers that I need to put on my lab book. People talked about precision and systematic error I don't get it I just need to write down the numbers on my lab book because I have two hours till class starts