Explain why the spectrum produced by a 1-gram sample of element z would have the same spectral lines at the same wavelengths as the spectrum produced by a 2gram
sample of element z.

The reason why the spectrum produced by a 1 gram sample of element z would have the same spectral lines at the same wavelengths as the spectrum produced by a 2gram is because  Mass does not determine the spectral lines

hope this helps

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2