MOLE CONCEPT AND STOICHIOMETRY

 PRACTICE SET -I

1. Define one mole?

2. A count of how many particles is known as one mole?

3. What is the atomic mass of Carbon atom?

4. What is the mass of 1 mole of Carbon atoms?

5. What is the mass of 1/12 of the mass of one atom of carbon?

6. Define one amu?

7. Deduce the relation between amu and gram.

8. How much amu is equal to 1-gram?

9. What is the value of standard temperature and pressure?

10. Convert 0 degree Celsius to Kelvin.

11. How much length of the mercury column of barometer equals to 1-atmospheric pressure?

12. Give the combined gas equation?

13. State whether the following statements are true or false?

1. Gay Lussac’s law states that at when gaseous reactants react to form gaseous products they do so bearing simple whole number ratio with each other and with the reactants. 

2. Avogadro’s law states that at similar condition of temperature and pressure equal volume of gases contains equal number of gaseous particles. 

3. Avogadro’s law states that at similar condition of temperature and pressure equal number of gases occupies equal volume.

4. At 1-atm. Pressure and 273 Kelvin temperature, 22.4L of any gas contains one mole gaseous particles.

5. Statement (b), (c) and (d) are related to each other and statement (d) is a specific case of the Avogadro’s law.

14. Fill in the blanks:-

a) Molar volume at S.T.P for any gas = _________

b) Molar volume at 100◦C and 10 atmospheric pressure = ___________

c) One mole = _______________ number of particles

d) Volume of O2 produced at STP if 10 moles of KClO3 is heated strongly = ___________

e) Volume of ammonia produced in Haber’s process if N2 is supplied excess but H2  supplied is 1 mole = ____

15. Define the following terms:-

(a) Gram atomic mass

(b) Gram molecular mass

(c) Relative molecular mass

(d) Relative atomic mass

(e) Vapour density

(f) Relative number of atoms in any molecule

16. Give relations :- 

 1 litre = ____ dm3 = ____cm3 = ______ cc

1 ppm = ____mg/L
1 amu = ____gram

Avogadro’s number = __________ = _________ mole.WORKSHEET –II

PRACTICE SET-II

1. What is the mass in grams of 1 mole of :

(i) Carbon dioxide

(ii) Ammonia

(iii) Potassium Chlorate

(iv) Calcium carbonate

(v) Water

(vi) Chlorine gas

(vii) Oxygen gas

(viii) Sulphur dioxide

(ix) Hydrogen chloride gas

(x) Hydrochloric acid

2. What is the mass in grams of 

(i) 8 moles of carbon dioxide

(ii) 0.75 mole of water

(iii) 0.01 mole of sugar

(iv) 0.1 moles of potassium hydroxide

(v) 0.05 moles of potassium dichromate

3. What is the number of moles in 

(i) 500grams of Ethane?

(ii) 250 grams of Methane?

(iii) 100 grams of Ethanol?

(iv) 50grams of Ethanoic acid?

(v) 25 gram of Silver nitrate?

4. What is the number of molecules in 

(i) 200 gram of calcium carbonate

(ii) 400 gram of sodium hydroxide

(iii) 980 gram of sulphuric acid

(iv) 3650 gram of hydrogen chloride

(v) 880 gram of carbon dioxide.

5. What is the mass in grams of the compounds in 

(i) 4.2161 X 1023 molecules of acetic acid ?

(ii) 6.023 X 1023 molecules of hydrogen peroxide ?

(iii) 1.2046 X 1021 molecules of calcium carbonate?

(iv) 3.0115 X 10 23 molecules of Nitrogen dioxide ?

(v) 4.8184 X 10 23 molecules of Acetic acid ?

6. What is the volume in litres at STP of 1 mole of

(i) Methane gas

(ii) Acetylene gas

(iii) Hydrogen Chloride gas

(iv) Ammonia gas

(v) Carbon monoxide

PRACTICE SET- III

1]. What is the volume at S.T.P:

(i)  in milliliters of 0.005 moles of hexane gas?

(ii) in litres of 5 moles of Butane gas ?

(iii) in milliliters of 0.2 moles of Benzene gas ?

2]. What is the number of moles in: 

(i) 22.4 litres of Ammonia gas at S.T.P?

(ii) 44.8 litres of Carbon dioxide at S.T.P?

(iii) 2.24 litres of Nitrous oxide at S.T.P?

(iv) 0.224 litres of Sulphur dioxide at S.T.P?

3]. What is the mass in grams of:

(i) 2.24 millilitres of propane at STP?

(ii) 448 millilitres of Nitric oxide at S.T.P?

4]. What is the mass in grams of:

(i) 5.6 litres of Propane at S.T.P. ?

(ii) 560 mL of Methane at S.T.P?

5]. What is the volume in litres at S.T.P of:

(i) 16 g of Methane gas ?

(ii) 0.14 g of Carbon monoxide gas ?

(iii) 1.8 g of Water vapour ?

6]. What is the volume (at S.T.P) occupied by: 

(i) 6.023 X 1023 molecules of Sulphur dioxide ?

(ii) 12.046 X 1023 molecules of Sulphur trioxide ?

7]. Calculate the percentage composition by weight of the following compounds :

(i) Water , (ii) Ammonia, (iii) Methane, (iv) Hydrochloric acid, (v) Ethane, (vi) Calcium nitrate

(vii) Nitric oxide, (viii) Magnesium chloride , (ix) Calcium Carbonate, (x) Sodium peroxide.

8].  5 moles of calcium carbonate are reacted with dilute hydrochloride acid.

(i) Write the equation for the reaction.

(ii) What is the mass of 5 moles of calcium carbonate ? 

(iii) What is the volume of carbon dioxide liberated at STP?

(iv) What mass of calcium chloride is formed ?

(v) How many moles of HCl are used in this reaction ?

9. What volume of NaOH solution of concentration 0.01 moles/L will be required to complete neutralize 25 mL of Phosphoric acid using phenolphthalein as an indication during a titration if the concentration of phosphoric acid is 0.05 moles/L.

10. How much dried and dessicated sample of pure Sodium carbonate should be dissolved in 250 mL of the water to prepare a solution of concentration 0.1 moles per litre?