Într-o butelie cu volumul de 500 litri se gasesc 2 kg de oxigen molecular, considerat gaz ideal. Se consumă o parte din gaz și rămân in butelie 0,5 kg. Temperatura este menținută constantă la 27 grade Celsius. Masa molară a oxigenului este 32kg/kmol. Se cere:a) masa unei molecule de oxigen; b) presiunea inițială din butelie; c)densitatea gazului rămas în butelie; d)numărul de molecule care au ieșit din butelie
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