Question

1. A flask contains 4.4 g of CO2 gas.
a. Calculate how many moles of CO2 does it contains
b. How many molecules of CO2 present.
c. How many atoms of oxygen present.
2. Calculate the number of SO3 molecule present in 44 g.
3. Calculate the number of molecules of sulphur (S8) present in 128 g of sulphur.
4. Which has more molecule
a. 10 g of N2
b. 10 g of O2
5. Which has more atoms
a. 10 g of C
b. 10 g of CO2
6. Calculate the number of oxygen atoms present in 120 g of Nitric acid.
7. Calculate the number of aluminium ion in 0.051 g of aluminium oxide.
8. Calculate mass of 1 oxygen atom.
9.
10. Calculate the mass of 1.2044 x 1023 –molecules of O2.
11. How many grams of sodium will have3 the same number of atoms as 6 g of magnesium?
12. The mass of one molecule of a substance is 4.65 x 10-23 g. what is its molecular mass? What
could this substance be?

Answer 1

Answer:

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Answer 2

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