Calculate the relative molecular masses of : (a). (NH4)2Cr2O7
(b). CuSO4.5H2O
(c). (NH4)2SO4
(d). CH3COONa
(e). Potassium chlorate
Answers
Answered by
31
Hello Dear.
Here is the answer---
→→→→→→→→→→
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
→→→→→→→→→→→
Hope it helps.
Have a Nice day.
Here is the answer---
→→→→→→→→→→
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
→→→→→→→→→→→
Hope it helps.
Have a Nice day.
danielochich:
Part (d) and (e) not correct
My answer is accurately Correct. In part 4, We know, the Carbon has 3 Isotopes, C-12,C-13, and C-14. Since the Value is not given in the Question, Thus we can take any of the value. I have taken the Value of the Carbon as 14 so You can calculate the answers.
In Part 5, I have taken the Value of Potassium as 40, which is is nearest. This can also be taken, you must know that. Thus, the answers is Right. If you still have any doubts, Please one Confirm it again. I will not be prove wrong.
In Part 5, I have taken the Value of Potassium as 40, which is is nearest. This can also be taken, you must know that. Thus, the answers is Right. If you still have any doubts, Please one Confirm it again. I will not be prove wrong.
Answered by
11
The relative atomic masses (RAM) are:
N=14, H=1, Cr=52, Cu=63.5, S=32,O=16, C=12, Na=23, K=39, CL= 35.5
(a). (NH4)2Cr2O7 = 2(14+1x4) + 2x52 + 7x16 = 252(b). CuSO4.5H2O = 63.5 + 32 + 16x4 + 5(1x2 + 16) = 249.5
(c). (NH4)2SO4 = 2(14 + 1x4) + 32 + 16x4 = 132
(d). CH3COONa = 12 + 1x3 + 12 + 16 + 16 + 23 = 82
(e). Potassium chlorate (KClO3) = 39 + 35.5 + 16x3 = 122.5
My answer is accurately Correct. In part 4, We know, the Carbon has 3 Isotopes, C-12,C-13, and C-14. Since the Value is not given in the Question, Thus we can take any of the value. I have taken the Value of the Carbon as 14 so You can calculate the answers. In Part 5, I have taken the Value of Potassium as 40, which is is nearest. This can also be taken, you must know that. Thus, the answers is Right. If you still have any doubts, Please one Confirm it again. I will not be prove wrong.
Are u there Sir? Have u comfirmed that?
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