Which of the following gases occupies 22.4 L at STP? A) 1 mol hydrogen, H_2 B) 1

Question

Which of the following gases occupies 22.4 L at STP? A) 1 mol hydrogen, H_2 B) 1 mol nitrogen, N_2 C) 1 mol of oxygen, O_2 D) all of the above E) none of the above How many ethane molecules are in 22.4 liters of C_2H_6 gas at STP? A) 1.20 times 10^24 B) 1.35 times 10^25 C) 1.81 times 10^24 D) 6.02 times 10^23 E) 2.69 times 10^22 What is the mass of 5.00 liters of oxygen gas, O_2, at STP? A) 0.286 g B) 3.50 g C) 6.40 g D) 7.14 g E) 112 g What is the density of nitrogen gas, N_2, at STP? A) 0.625 g/L B) 0.800 g/L C) 1.25 g/L D) 1.60 g/L E) 22.4 g/L What is the volume occupied by 0.750 g of nitrogen gas, N_2, at STP? A) 0.600 L B) 0.938 L C) 16.8 L D) 37.3 L E) 836 L

Explanation / Answer

42) D) all the above (1 mole of any gas at NTP occupies 22.4 liters of volume)

43) D) 6.02*1023 (1 mole = 6.02*1023)

44) D) 7.14 g    ( n = PV/RT = 0.22 mol = 7.14 g)

45) C) 1.25 g/L (density = mw x P / RT, (28.0 g/ mole) x (1 atm) / (0.0821 Latm/moleK x 273 K) = 1.25 g/L)

46) A) 0.600 L (V = (nRT)/P, V = (0.026)(0.08206)(273.15)/(1))

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