A sample of liquid with a mass of 8.657g was decomposed into its elements and are 5.217g of carbon, 0.9620g of hydrogen, and 2.478g of oxygen. Calculate the % composition. how do you work this out please help ​

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.