Question
5. Correct subscripts are essential for correctly writing a chemical formula True False 6. How many atoms of oxygen are there in 5 mol of
5. Correct subscripts are essential for correctly writing a chemical formula
True
False
6. How many atoms of oxygen are there in 5 mol of CO2?
6 x 1024 atoms
10 atoms
6 x 1023 atoms
3 x 1024 atoms
5 atoms
7. Which has more atoms, 1 mol of helium or 1 mol of argon?
The number of atoms cannot be determined
The mol of He has more atoms
They both have the same number of atoms
The mol of Ar has more atoms
8. A 115 g sample of dry ice, CO2, contains how many moles?
4.11 mol
28.0 mol
2.61 mol
5.06 x 103 mol
44.0 mol
3.22 x 103 mol
9. Given a 6.25 mol sample of Ag, how many atoms are present? Give your answer to the correct number of sig figs and use e or *10^ for entering your answer in scientific notation.
10. Given the following imaginary elements and average atomic masses, calculate the molar mass of the compound AX2R3 to two decimal places.
Symbol | Ave. Atomic Mass |
A | 32.39 |
D | 93.80 |
R | 17.79 |
X | 22.68 |
11. How many nanomoles (nmol) is a 59.5 microgram (g) sample of sulfur? Give your answer to 3 sig figs AND in scientific notation.
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