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83. An electron tube was sealed off during manufacture at a pressure of

1.2×10-7 mm of mercury at 27°C. Its volume is 100 cm3. The number of molecules that remain in the tube is

(a)  2×1016                                        (b) 3×1015

(c)  3.86×1011                                  (d) 5×1011

Answer-c

(9)

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