A gas mixture with a total pressure of 745 mbar contains each of the following gases at the indicated partial pressures: CO2, 125 mbar; Ar, 214 mbar; and O2, 187 mbar. The mixture also contains helium gas. What is the partial pressure of the helium gas? What mass of helium gas is present in a 12.0 L sample of this mixture at 273 K?

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A: Let P = 1 atm V = 0.058 L T = 40oC = 313.15 K R = 0.0821 L atm mol-1K-1 Molar mass of O2 = 32 g/mol

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Q: 2. A chemist reacts 0.51 mole H₂ with 0.36 moles of N₂ to make NH, If the total pressure before the…

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Q: Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right).…

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Q: 2 Co (s) + O2 (g) --> 2 CoO (s) If 8.18 grams of solid cobalt react in a 3.21 L vessel at -34.80 oC…

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Q: What volume of oxygen gas is produced

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Q: When excess water is added to 10.3 grams of magnesium nitride, what volume of ammonia gas would be…

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Q: Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right).…

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Q: None

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Q: Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right).…

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Q: A mixture of xenon and argon gases, in a 5.91 L flask at 13 °C, contains 43.3 grams of xenon and…

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Q: Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right).…

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Q: An old 0.500 L lecture bottle of hydrogen chloride (HCI) was found in a lab and needed for a…

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