1.

Calculate the relative molecular masses of : (a). (NH4)2Cr2O7(b). CuSO4.5H2O(c). (NH4)2SO4(d). CH3COONa(e). Potassium chlorate

Answer» Hello Dear.

Here is the answer---

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For calculating the Relative Molecular mass, we need to know the atomic masses the of the ELEMENTS mentioned in the given Chemical Formula.

Thus, the atomic masses of some of  the elements which are in the question are----

Atomic Mass of NITROGEN = 14 
----------------------------Hydrogen = 1 .
------------------------------ CR = 52 
-----------------------------Oxygen = 16 
-------------------------------Copper = 64 
-------------------------------Sulphur = 32 
-----------------------------------Sodium = 23
---------------------------------Potassium = 40 
-------------------------------Chlorine = 35.5
-------------------------------CARBON = 14

Now, the Relative atomic masses of the given compounds are---- 

(a)

For Relative Molecular Mass,
 (NH₄)₂Cr₂O₇ = 2(14 + 4 × 1) + 2 × 52 + 7 × 16
                       = 2 × 18 + 104 + 112
                      = 36 + 216
                      = 252 

(b) CuSO₄.5H₂O = 64 + 32 + 16 × 4 + 5(2 × 1 + 16)
                            = 96 + 64 + 90
                            = 160 + 90
                            = 250 


(c) (NH₄)₂SO₄ = 2(14 + 4 × 1) + 32 + 4 × 16
                       = 2 × 18 + 32 + 64
                       = 36 + 96
                       = 132 

(d) CH₃COONa = 14 + 3 × 1 + 14 + 16 + 16 + 23
                          = 28 + 3 + 32 + 23
                          = 60 + 26
                          = 86

(e) Potassium Chlorate.
Chemical Formula of Potassium Chlorate = KClO₃

KClO₃ = 40 + 35.5 + 3 × 16
           = 75.5 + 48
           = 123.5


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Hope it helps.

Have a Nice day.


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