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Chemistry, 22.02.2021 07:20 hay89

1. O butelie de oxigen folosită pentru sudura metalelor are un volum de 10L. Câţi moli de oxigen se găsesc în butelie dacă presiunea este de 200atm iar temperatura la care se află butelia este de 150C? 2. Intr-o butelie de gaz cu volumul de 0,75 L se gaseste gaz la presiunea de 300 atm si temperatura de 280C. Ce număr de moli se găseşte în butelie? Dacă s-a consumat 25% din cantitatea de gaz, ce presiune are acum gazul?
3. Calculaţi numărul de particule (molecule şi atomi) din:
1. 3 Kmoli Br2
2. 20 g O2
b. Câţi moli conţin 123,54 x1024 molecule de hidrogen?

1. Volumul unei butelii de gaz este de 100 mL. Butelia conţine 4 moli de gaz la presiunea de 0,05 atm. Ce temperatură (in grade Celsius) va avea gazul?
2. O sticlă de plastic de 2L conţine aer la temperatura de 100C şi presiunea de 0,2 atm. Sticla este răcită la temperatura de 20C în frigider. Câţi moli de aer sunt în sticlă? Ce se întâmplă cu presiunea aerului din sticlă?
3. Calculaţi numărul de particule (molecule şi atomi) din:
1. 2,4 Kmoli O2
2. 15 g N2
b. Câţi moli conţin 114,8 x1024 molecule de azot?

1. O minge de ping pong are volumul de 2 dm3. Ea este umplută cu aer la presiunea de 1 atm la temperatura camerei de 270C. Câţi moli de aer sunt în minge?
2. O butelie cu volumul de 1,5 L conţine aer la temperatura de 300C şi presiunea de 2 atm. Câţi moli de aer sunt în butelie? Din butelie se consumă 70% din aer. Dacă temperatura rămâne aceeaşi ce presiune va avea clorul în butelie?
3. Calculaţi numărul de particule (molecule şi atomi) din:
1. 1,9 moli Br2
2. 56 g He
b. Câţi moli conţin 4896 x1022 molecule de clor?

Sunt clasa a-9-a. Am precizat asta pentru a nu folosi alte formule

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