1. Copper has two naturally occurring isotopes. Cu-63 has an atomic mass of 62.9296 amu and an abundance of 69.17%.

a. What is the percent abundance of the second isotope?

b. What is the average atomic mass of copper?

c. What is the mass of the second isotope? SHOW YOUR WORK FOR CREDIT

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

Acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor how many grams of water are produced by the same amount of c2h2?