A sample of hydrogen gas is collected and it is observed that it contains only H and D atoms in the atomic ratio . The number of neutrons in of such a sample should be nearly

Question

A sample of hydrogen gas is collected and it is observed that it contains only H and D atoms in the atomic ratio . The number of neutrons in  of such a sample should be nearly

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Strategy:
 In this isotopic mixture, only Deuterium () has a neutron, while Protium () has none. The total number of neutrons in the sample is simply the total number of Deuterium atoms present.

Step 1: Calculate total atoms in the sample
Assuming atomic mass  (since H dominates).
Moles of atoms in .
Total atoms .

Step 2: Find the number of D atoms
The ratio of  is .

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