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Standard IX
Chemistry
Molecular Mass
What is the f...
Question
What is the formula mass unit of
H
C
l
?
A
36.5
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B
35.5
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C
32.5
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D
34.5
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Solution
The correct option is
A
36.5
Formula mass unit of
H
C
l
is : Mass of hydrogen
(
1
)
+
mass of chlorine
(
35.5
)
=
(
35.5
+
1
)
=
36.5
Hence, option A is correct.
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Q.
In the HCl molecule, the separation between the nuclei of hydrogen and chlorine atoms is 1.27
∘
A
. If the mass of a chlorine atom is 35.5 times that of a hydrogen atom, the centre of mass of the HCl molecule is at a distance of
Q.
Calculate the formula unit mass (u) of
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[ Ca = 40 u, Cl = 35.5 u]
Q.
If the mean and median of a unimodal data are 34.5 and 32.5 respectively, then mode of the data is __________.
Q.
(a) Define 'formula unit' of an ionic compound. What is the formula unit of (i) sodium chloride, and (ii) magnesium chloride ?
(b) Calculate he formula masses of the following compounds :
(i) Calcium chloride
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