Basic Concepts of Chemistry
Basic Concepts of Chemistry
Basic Concepts of Chemistry
ASSIGNMENT 2022
BASIC CONCEPTS OF CHEMISTRY
Q1. a) How many atoms and molecules of Phosphorus are present in 124 g of P4?
b) How many atoms and molecules of oxygen are present in 5.6 L of Ozone?
Q3. What is the mass of (i) single atom of sulphur and (ii) single molecule of carbon dioxide?
Q6. Calculate the mass of Carbon dioxide gas which contains the same no of molecules as are contained in
40g oxygen gas.
Q7. If the density of Methanol (CH3OH) is 0.793 g/cc, how many molecules of it are present in 5 mL of it?
Q8. Calculate the number of Silver atoms in a silver bangle which has 90% purity and has a weight of 20g.
Q9.Density of CCl4 vapour is 6.87 g/L at STP. What is the number of chlorine atoms present in 100 mL of it at
the same temperature and pressure ?
Q10 What is the total number of Sodium ions present in a sample of washing soda Na2CO3.10H2O weighing
14.3 mg ?
Q11. What is the molar mass of a gas whose 4.4 g occupies a volume of 2.24 L at STP?
Q12. Haemoglobin contains 3.5 mg of Iron in 1 g of it. What will be the number of Iron atoms present in 2 g of
Haemoglobin ? Atomic mass of Iron is 56 u.
Q13 Density of Aluminium metal is 2.7 g/cc. If a 2 mm thick layer of Al is deposited on a metal piece which has
an area of 9 cm² , how many moles of Aluminum will be deposited? Also calculate the number of atoms.
Q14. What mass of Magnesium nitrate will have 0.25 moles of Oxygen atoms?
Q15. Calculate the volume of Hydrogen gas in litres which has as many molecules as are present 56 g of
Ozone at STP.