A sample of phosphorus was isolated and analyzed to determine the percent abundance of each isotope. The results are recorded in the table. Isotope

Mass (amu)

Percent Abundance

Phosphorus-29

29

5%

Phosphorus-31

31

71%

Phosphorus-32

32

24%

Based on the data, which statement gives the best reasoning to support that the average atomic mass for the sample of phosphorus based on its isotopes is 31.14 amu?

A.
Phosphorus-31 makes up the majority of the sample so the average atomic mass should be close to 31.

B.
It is the sum of neutrons and electrons in the isotopes found in a sample.

C.
It is the total number of neutrons, protons, and electrons in the isotopes found in a sample of phosphorus.

D.
It is the mean of all of the different isotopes of phosphorus present in the sample.

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Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water