Class 9 Exam > Class 9 Questions > Calculate the formula unit mass of ZnCl2?a)13...
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Calculate the formula unit mass of ZnCl2?
- a)136.3 u
- b)124 u
- c)123 u
- d)111 u
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Calculate the formula unit mass of ZnCl2?a)136.3 ub)124 uc)123 ud)111 ...
Formula mass unit is calculatedin same way as molecular mass.
so,zncl2= 65.3+35.5 x 2
= 65.3+71
=136.3
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Calculate the formula unit mass of ZnCl2?a)136.3 ub)124 uc)123 ud)111 ...
Formula Unit Mass of ZnCl2
Formula unit mass is the sum of the atomic masses of all the atoms present in a formula unit of a compound. To calculate the formula unit mass of ZnCl2, we need to know the atomic masses of zinc (Zn) and chlorine (Cl).
Atomic masses:
- Zn = 65.38 u
- Cl = 35.45 u
Formula unit mass calculation:
- ZnCl2 = Zn + 2Cl (since there are two chlorine atoms in one molecule of ZnCl2)
- Formula unit mass of ZnCl2 = atomic mass of Zn + (2 x atomic mass of Cl)
- Formula unit mass of ZnCl2 = 65.38 u + (2 x 35.45 u)
- Formula unit mass of ZnCl2 = 65.38 u + 70.9 u
- Formula unit mass of ZnCl2 = 136.28 u
Therefore, the correct answer is option A (137 u).
Formula unit mass is the sum of the atomic masses of all the atoms present in a formula unit of a compound. To calculate the formula unit mass of ZnCl2, we need to know the atomic masses of zinc (Zn) and chlorine (Cl).
Atomic masses:
- Zn = 65.38 u
- Cl = 35.45 u
Formula unit mass calculation:
- ZnCl2 = Zn + 2Cl (since there are two chlorine atoms in one molecule of ZnCl2)
- Formula unit mass of ZnCl2 = atomic mass of Zn + (2 x atomic mass of Cl)
- Formula unit mass of ZnCl2 = 65.38 u + (2 x 35.45 u)
- Formula unit mass of ZnCl2 = 65.38 u + 70.9 u
- Formula unit mass of ZnCl2 = 136.28 u
Therefore, the correct answer is option A (137 u).
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Community Answer
Calculate the formula unit mass of ZnCl2?a)136.3 ub)124 uc)123 ud)111 ...
Formula mass unit is calculatedin same way as molecular mass.
so,zncl2
= 65.3 + 35.5 x 2
= 65.3 + 35.5 x 2
= 65.3 + 71
= 136.3
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Calculate the formula unit mass of ZnCl2?a)136.3 ub)124 uc)123 ud)111 uCorrect answer is option 'A'. Can you explain this answer?
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