Question

1)Determinați nr de molecule conținute intr o masă de 1 kg de hidrogen2 2)Sa se afle masa unei molecule de hidrogen (H2).​

Answer 1

[tex]1.\mu_{H_2}=2 g=0,002 kg\\ \nu=\frac{m_{H_2}}{\mu_{H_2}}=\frac{1}{0,002}=500 moli\\ N=\nu N_A=500*6,022*10^{23}=3*10^{26} molecule\\ \\ 2.\mu_{H_2}=2 g=0,002 kg\\ N=1 molecula\\ N=\nu N_A=>\nu=\frac{N}{N_A}=\frac{1}{6,022*10^{23}}=0,16*10^{-23}moli\\ \nu=\frac{m_{H_2}}{\mu_{H_2}}=>m_{H_2}=\nu\mu_{H_2}=0,16*10^{-23}*0,002=0,000332*10^{-23} kg [/tex]