شرح للكيمياء و أسئلة مراجعة

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نكمل .....

6. What is the molar mass of Freon-11 gas if its density is 6.13 g/L at STP?
A. 0.274 g/mol
B. 3.64 g/mol
C. 78.2 g/mol
D. 137 g/mol
E. 365 g/mol

طالب المولار ماس لغاز الفريون

7. A mixture of three gases has a total pressure of 1,380 mmHg at 298 K. The mixture is analyzed and is found to contain 1.27 mol CO2, 3.04 mol CO, and 1.50 mol Ar. What is the partial pressure of Ar?
A. 0.258 atm
B. 301 mmHg
C. 356 mmHg
D. 5,345 mmHg
E. 8,020 mmHg

تقريبا حلينا زيها في الأسئلة اللي فاتت ... جربوا بنفسكم

8. A sample of hydrogen gas was collected over water at 21C and 685 mmHg. The volume of the container was 7.80 L. Calculate the mass of H2(g) collected. (Vapor pressure of water = 18.6 mmHg at 21 C.)
A. 0.283 g
B. 0.572 g
C. 0.589 g
D. 7.14 g
E. 435 g

هذه شبه سؤال 14 و التمرين اللي في الكتاب ....


9. A 0.271 g sample of an unknown vapor occupies 294 mL at 140C and 847 mmHg. The empirical formula of the compound is CH2. What is the molecular formula of the compound?
A. CH2
B. C2H4
C. C3H6
D. C4H8
E. C6H12

شبه سؤال سابق بس الفرق أنه ريحنا من حساب الصيغة الأولية

10. How many liters of chlorine gas at 25C and 0.950 atm can be produced by the reaction of 12.0 g of MnO2?
MnO2(s) + 4HCl(aq)  MnCl2(aq) + 2H2O(l) + Cl2(g)

A. 5.36  10-3 L
B. 0.138 L
C. 0.282 L
D. 3.09 L
E. 3.55 L

مثل مسألة حليناها قبل ....