1. Fill in the blanks
2. Compute the difference in masses of 103 moles each of magnesium atoms and magnesium ions.
4. Compute the number of ions present in 5.85 g of sodium chloride.
5. A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?
6. What are ionic and molecular compounds? Give examples.
7. Compute the difference in masses of one mole each of aluminum atoms and one mole of its ions. (Mass of an electron is (9.1×10–28 g). which one is heavier?
8. A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.
9. A sample of ethane (C2H6) gas has the same mass as 1.5 ×1020
10. What is the fraction of the mass of water due to neutrons?
11. Does the solubility of a substance change with temperature? Explain with the help of an example.
12. Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol-1
13. Verify by calculating that
14. A sample of vitamin C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
15.If bromine atom is available in the form of, say, two isotopes 7935Br (49.7%) and 8135Br (50.3%), calculate the average atomic mass of bromine atom.