Disilicon Trisulfide formula?

1.35 kg

Explanation:

The uncertainty allows us to know the interval where a measured value is found taking into account the errors that the measurements may have.

Uncertainty is calculated in different ways depending on the type of procedure that is followed. In this case, the value of it is already being given (3%), whose percentage should be applied to the value that the instrument gives us.

Therefore, since the indicated mass is 45 kg, the uncertainty value is calculated as:

45 kg x (3/100) = 1.35 kg