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Byju's Answer
Standard XII
Chemistry
Molarity
The molarity ...
Question
The molarity of heavy water
D
2
O
is :[ assume,density of
D
2
O
is 1 g/ml]
A
55.55M
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B
50.78M
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C
48M
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D
50M
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Solution
The correct option is
B
50.78M
Heavy water (deuterium oxide, D2O).
To calculate its molarity you need two costants. Its density at 25C and its molar mass. These are 1.0 g/cm3 and 20.0276 g/mol
Molarity = (density / molar mass ) x 1000 moles per litre
= 50.78 Molar
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