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The amount of nitrogen in an organic subsxtance can be determined by an anlytical method called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammonia. The ammonia, which is a weak base, can be neutralized with hydrocholoric acid, as described in the equation. NH3(aq) + HCl(aq) arrow NH4Cl(aq) If 22.0 mL of 0.150 M HCL (aq) is needed to neutralize all the NH3(g) from a 2.25 g sample of organic material, calculate the mass percentage of nitrogen in the sample.
A cook wants to heat 1.89 kg of water from 31.0 C to 100.0 C If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 kJ of heat per gram. (For the sake ..
What does ozone do that oxygen (or any other molecule) do? How? Ozone is created in what is believed to be a two-step process. It is destroyed naturally in one of two pathways. What are those reactions? On Your Own: What is the role of UV in the d..
If a solution containing 63.411 g of mercury(II) chlorate is allowed to react completely with a solution containing 16.642 g of sodium sulfate, how many grams of solid precipitate will be formed. How many grams of the reactant in excess will remai..
F the volume of ocean water (calculated above) contains 3.3 percent sodium chloride ("salt") by mass and the density of the water is 1.76 g/mL, calculate the total mass of sodium chloride. (1 ton = 2000 lb, 1 lb = 453.6 g)
identify the stronger acid in each of the following pairs a)NH4^+ or H3O^+ b)H2SO4 or HCN c)H2O or H2CO3
A gas mixture contains each of the following gases at the indicated partial pressures: N2, 221 torr; O2, 131 torr; and He, 131 torr.
What is the partial pressure of SO2(g) in the larger container. What is the partial pressure of N2(g) in this vessel. What is the total pressure in the vessel
A piece of dry ice (solid carbon dioxide) with a mass of 28.5 g is allowed to sublime (convert from solid to gas) into a large balloon. Assuming that all of the carbon dioxide ends up in the balloon, what will be the volume of the balloon at a tem..
Calculate the pH of 1.00 L of a buffer that is 0.130 M HNO2 and 0.190 M NaNO2. What is the pH of the same buffer after the addition of 1.00 mL of 12.0 M HCl. (pKa of HNO2 = 3.40)
the pH of a neutral solution is 7.83. What is the value of Kw at that temperature?
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places.
A balloon is floating around outside your window. The temperature outside is 1\, ^{\circ}C , and the air pressure is 0.700atm . Your neighbor, who released the balloon, tells you that he filled it with 3.20moles of gas. What is the volume of gas i..
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