A gas-flask-A has twice the volume as flask-B. Flask-A is filled with nitrogen, while flask-B is filled with nitrous oxide, N2O. If flask-A contains 30.4 g of N2, how many grams of N2O is in flask-B? Both gases are at the same temperature and pressure.        (A) 15.2 g                              (B) 47.8 g       (C) 20.3 g                  (D) 23.9 g

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