Year 11 Chemistry - Unit Three

Stoichiometry [print-friendly version]

1.    Explain the meaning of the following terms (give an example or mathematical formulae where appropriate).

a) Atomic Number                        

c) Solvent 

d) Solute

e) Solution

f) Concentration

g) Empirical formula         

h) Mass Number                                   

j) Isotope                                            

k) Mole                                       

l) Molar mass                                       

2.     Calculate the molar masses of the following covalent molecular substances

      (a) Carbon dioxide CO₂                  (b)  water H₂O                 (c)  ammonia NH₃       

      (d)  methane  CH₄                 (e)   sulfur trioxide SO₃         (f)   nitrous oxide N₂O   

      (g)  nitrogen   N₂                            (h)   phosphene PH₃                    (i)   methanol  CH₃OH             

      (j)  hydrogen chloride    HCl      (k)   sulfuric acid  H₂SO₄      (l)   nitric acid   HNO₃        

       (m)  carbon monoxide  CO

3.   Calculate the molar masses of the following ionic substances.

(a)  NaOH          (b)   CaCO3  (c)  NH4NO3          (d)    Cu SO4          (e)  Fe(OH)2       (f)  (NH4)2SO4

4.  Calculate the mass of the following

(a)  0.25 mol of NaOH  (b)    0.5 mol CaCO₃          (c)  0.001 mol  Cu SO₄        (d)    20 mol H₂O

(e)  0.125 mol of  H₂SO₄

5.   Calculate the amount of

(a)  25gof CaCO₃                   (b)  0.04g of NaOH                    (c)  1.4g CO           (d)   1kg H₂O   

6.   Calculate the concentration of

(a)  0.2 mol NaOH in 100mL water     (b)   0.05 mol HCl in 250mL water      

(c)   2mol  Cu SO₄  in 4L water                   (d)   0.125 mol of  H₂SO₄   in  100mL of water   

(e)   0.01 mol C₂H₅OH in 25 mL of water.

7.   Calculate the amount of the following substances

(a)  100 mL  of   0.04 mol/L NaOH   (b)   10mL of 0.01 mol/L  H₂SO₄     

(c)    25mL of 2 mol/L H₂SO₄                    (d)  200mL of  10mol/L HCl       

(e)    23.5 mL of 0.235 mol/L  KMnO₄

8.   Calculate the mass of the following solutes

(a)  100 mL  of   0.04 mol/L NaOH   (b)   10mL of 0.01 mol/L  H₂SO₄    

(c)    25mL of 2 mol/L H₂SO₄                    (d)  200mL of  10mol/L HCl                      

(e)    23.5 mL of 0.235 mol/L  KMnO₄

9.   How many molecules are in the following

(a)   0.01mol of CO₂          (b)  2 mol  H₂O  (c)   0.05 mol NH₃           (d)  3.01 mol    HCl

10.  How many atoms of hydrogen and oxygen are in the following

(a)  1 mol  H₂O   (b)  0.1 mol  C₂H₅OH

11.   Find the amount of sodium ions and hydroxide ions are in the following

(a)    1 mol NaOH            (b)    0.02 mol NaOH   (c) 2 mol NaOH

12.  Find the amount of Barium ions and hydroxide ions are in the following

(a)  1 mol Ba(OH)₂          (b)   0.02 mol Ba(OH)₂             (c)  0.1 mol Ba(OH)₂