Hi. I\'m taking my finals online and I have 6 more questions but Ihave NO idea o

Question

Hi. I'm taking my finals online and I have 6 more questions but Ihave NO idea on how to answer them... Can you guys help me?

1Find the average atomic mass of the element,
given the isotopic percentage of 75.0% for Cl-
35 and 25.0% for Cl-37.
1. 37.0 u
2. 35.5 u
3. 35.0 u
4. 36.5 u

2.Calculate the molar mass of sulfur in a sample
that consists of 92.32% 32S (molar mass 31.97
g/mol), 3.05% 33S (molar mass 32.97 g/mol),
4.63% 34S (molar mass 33.97 g/mol).
Answer in units of g/mol.

3.The atomic weight of a newly discovered el-
ement is 10.600 amu. It has two naturally
occuring isotopes. One has a mass of 10.000
and a natural abundance of 70.000%. What
is the isotopic mass of the other isotope?
1. 10.000
2. 11.200
3. 10.600
4. 11.500
5. 9.0000
6. 10.500
7. 11.000
8. 9.5000
9. 12.000

4.The number of moles in 12.0 g of C2H6O
(molar mass of 46.1 g/mol) is calculated as
follows:
1. 12.0 times 24.0.
2. 12.0 divided by 24.0.
3. 12.0 divided by 46.1.
4. 12.0 times 46.1.

5.A compound is 69.9% iron and 30.1% oxygen
by mass. How much iron could by obtained
from 5.41 grams of the compound?
1. 3.78 mol
2. 0.0292 mol
3. 0.865 mol
4. 0.0677 mol
5. 0.0969 mol
6. 211 mol

6.What is the % carbon by weight in a beaker
containing 89.5 mL of CH3OH? The density
of methanol is 0.811 g/mL.
1. 13.4%
2. 37.5%
3. 81.1%
4. 16.5%
5. Not enough information is given
6. 10.9%

Thanks.

Explanation / Answer

1)2. 35.5 u

2)32.0931

3)9. 12.000

4). 12.0 divided by 46.1.

5)3.78 mol

6)27.2191875(pl verify)

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