Data:

Electronic Scale

Triple Beam Balance

Mass each isotope

Number of each isotope

Average mass of each isotope Percent of each

Relative Abundance

Relative Weight

Large White Bean 27.1g ±0.1g 63

0.4302 ±0.015g 22.74% 0.2274 0.0978g

Round White Bean 10.7g ±0.1g 65 0.1646±0.015g 23.47% 0.2347 0.0386g

Small Green/Brown Bean 4.15g ±0.1g 70 0.0593±0.015g 25.27% 0.2527 0.015g

Small Red Bean 3.65g ±0.1g 47 0.0777±0.015g 16.97% 0.1697 0.0132g

Medium Black Bean 4.75g ±0.1g 26 0.1827±0.015g 9.39% 0.0939 0.0172g

Large Red Bean 3.1 g ±0.1g 6 0.5167±0.015g 2.17% 0.0217 0.0112g

Total 53.45g ±0.6g 277 1.4312±0.09g 100.01% 1.0001 0.193g

* The cup mass was 2.3g

Mass each isotope

Number of each isotope

Average mass of each Isotope

Percent of each

Relative Abundance

Relative Weight

Large White Bean 27.4g ±0.1g 63 0.4349 ±0.02g 22.74% 0.2274 0.0989g

Round White Bean 11.3g ±0.1g 65 0.1738±0.02g 23.47% 0.2347 0.0408g

Small Green/Brown Bean 4.2g ±0.1g 70 0.06±0.02g 25.27% 0.2527 0.0152g

Small Red Bean 3.8g ±0.1g 47 0.0809±0.02g 16.97% 0.1697 0.0137g

Medium Black Bean 4.9g ±0.1g 26 0.1885±0.02g 9.39% 0.0939 0.0177g

Large Red Bean 3.1g ±0.1g 6 0.5167±0.02g 2.17% 0.0217 0.0112g

Total 54.7g ±0.6g 277 1.4548±0.12g 100.01% 1.0001 0.1975g

Questions:

1.) Which of your data in Table 5.1 must be measured and which can be calculated?

a. Mass of each isotope and number of each isotope should be measured

because these factors are used to calculate average mass of each, percent

of each, relative abundance, and relative weight.

2.) In all expect Step 3 in Table 5.1, the numbers in the “Total” column can be

obtained by adding the numbers across each row. Step 3 is an exception because it

does not take into account the fact that there are different numbers of each kind of

particle. Rather than add across, calculate this number in the same way you

calculated the other numbers in row 3.

a. Electronic Scale: 1.4547g

b. Triple Beam Balance: 1.4311g

3.) What is the difference between percent and relative abundance?

a. Percentage abundance is comparing the total and relative abundance is

comparing each isotopes

4.) What is the result when you total the individual percentage? The individual

relative abundance?

a. The percentage should be 100%, but the result from this lab had extra 0.01%

added. Also, individual relative abundance should be 1, but from this data

collection, there are 0.0001 additions.

5.) The percentage of each vegetable tells you how many of each kind of vegetable

there are in every 100 particles. What does relative abundance tell you?

a. It tells me how much of each isotope is shown in certain amounts

6.) Compare the total values for Steps 3 and 6 on Table 5.1.

a. 1.4548g and 0.1975g

i. 1.2573g Differences

7.) Why can’t atomic masses be calculated the way the total for row 3 is calculated?

a. The reason is because it is mixed of certain number of isotopes. It seems

like nowhere to use it.

8.) Explain any differences between the atomic mass of your vegium sample and that

of your neighbor. Explain why the difference would be smaller if larger samples

were used,

a. It might be because there are numerous different weights of each isotope

and certain numbers. We don’t have same size and number of each isotope.

9.) Do the experiments to determine the atomic weight of a second sample of vegium.

How does it compare to the first? Why?

a. It can be difference because there are lots of type of objects and there are

more other results

10.) Select three beans from your sample – the largest, the smallest, and one

ben that appear to be average in size. Determine the mass of each of the three.

Compute the average mass of the largest and smallest, and compare this average

to the mass of the “average” bean and to the average mass of beans you

determined in Step 2 on Table 5.1. Which average mass do you think is most

reliable? Why?

a. The largest will be large red bean, smallest will be small green/brown

bean, and average size will be large white bean. The mass of largest was

0.49g, smallest was 0.06g, and average size is 0.44g. The average mass of

largest is 0.5167g, smallest is 0.06g, and average is 0.4349g. I think the

second one is more reliable since there are more beans used and gets better

accurate average mass by comparing certain numbers of beans.