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. How many liters of NH3, at STP, will react with 5.3 g O2 to form NO2 and water? 4NH3(g) +7O2(g) à 4NO2 + 6H2O(g) A. 0.00423 L B. 3.03 L C.
2.12 L D. 6.49 L
use molar mass to finf moles of O2: 5.3 g O2 @ 32.0 g/mol = 0.1656 moles of O2 use this ratio: 4NH3(g) + 7O2(g) - > , [ to find moles of NH3: 0.1656 mol O2 @ 4 mole NH3 / 7 mol O2 = 0.09464 moles of NH3 using the "molar volume " ratio for gases @ STP, find the litres of NH3: 0.09464 moles NH3 @ 22.4 litres / mole STP = 2.12 litres the answer is 2.1 litres ]
Expert answered|jbgingz|Points 199|
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Asked 5/19/2013 7:25:11 AM
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What causes Brownian motion in colloids? A. Coagulation of particles of the dispersed phase B. Erratic flashes of light C. There is no Brownian motion in colloids. D. Molecules of the dispersion medium colliding with dispersed phase particles
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Asked 5/19/2013 6:56:38 AM
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. Which of the following materials is NOT a colloid? A. alloy B. smoke C. glue D. muddy water
Weegy: Alloy is not a colloid. (More)
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Asked 5/19/2013 6:55:10 AM
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. In any physical or chemical change, mass is not conserved. A. True B. False
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Updated 5/19/2013 2:36:23 PM
1 Answer/Comment
In any physical or chemical change, mass is not conserved. This statement is B. False. According to the law of conservation of mass, mass can neither be created nor destroyed in any physical change or chemical reaction.
Added 5/19/2013 2:36:23 PM
If the percent (mass/mass) for a solute is 4% and the mass of the solution is 200 g, what is the mass of solute in solution? A. 50 g B. 80 g C. 800 g D. 8.0 g
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Updated 1/4/2015 7:29:26 PM
1 Answer/Comment
If the percent (mass/mass) for a solute is 4% and the mass of the solution is 200 g, the mass of solute in solution is 4%*200 g = 8.0 g
Added 1/4/2015 7:29:26 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by andrewpallarca [1/4/2015 7:33:40 PM]
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