The calculated yield for iron sulfide was 16.8 grams but the measured yield was 11.6 g what is the percent yield?
2febr3+3na2s=fe2s3 + 6nabr

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Why is the melting of ice a physical change ?