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How many moles of chloroethylene (C2H3Cl) contain 5.47 × 1026 molecules?
Vienna
The capital city of Austria, known for its cultural contributions, historical significance in European politics, and as the host of major international diplomatic events.
Cuban Missile Crisis
A 13-day confrontation in October 1962 between the United States and the Soviet Union over Soviet ballistic missiles deployed in Cuba, marking the peak of Cold War tensions.
Hotline
A direct and immediate telephone line for emergency communication or for obtaining information.
Kremlin
A fortified complex in the heart of Moscow, Russia, historically the residence of the tsars and now the official residence of the President of Russia.
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