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- pls help asap on all asked questions.3. Balloons are filled with equal volumes of different gases and are allowed to sit at room temperature. The balloon filled with which gas will last the longest (deflate the slowest)? (a) HCl (b) Ne (c) Xe (d) Ar (e) they will deflate at the same rate 4.If gas A has a MW of 20 and gas B has a MW of 80 which of the following is true. (a) A will diffuse four times as fast as B (b) A will diffuse twice as fast as B (c) B will diffuse four times as fast as A (d) B will diffuse twice as fast as A (e) since diffusion rates depend only on temperature, they will diffuse at the same rate lon woight (c)The gas in the discharge cell of a laser contains (in mole percent) 11% CO2, 5.3% N2, and 84% He. (a) What is the molar mass of this mixture? (b) Calculate the density of this gas mixture at 328C and 758 mm Hg. (c) What is the ratio of the density of this gas to that of air (MM air = 29.0 g/mol) at the same conditions
- In Part B, you used a similar procedure to that of Part A to determine the mass percent of CaCO3 in an antacid tablet. The commercially accepted range of CaCO3 in an antacid tablet is 25–35% by mass. Miranda obtained the data below from her Part B trial: TRIAL PRESSURE (torr) MASS OF TABLET (g) TEMPERATURE (°C) VOLUME CO2 RECOVERED (mL) 1 750.5 0.5702 21.3 69.6 2 750.5 0.5622 21.2 68.2 Miranda determined her average % Recovery of CO2 to be 65.0% from Part A. Based on her data collected from Part A, was the average percent mass of CaCO3 in her antacid tablet within the commercially accepted range? Yes, her mass percent does fall within the commercially accepted range. No, her mass percent does not fall within the commercially accepted range.In a certain experiment, magnesium boride (Mg₃B₂) reactedwith acid to form a mixture of four boron hydrides (BₓHᵧ), threeas liquids (labeled I, II, and III) and one as a gas (IV).(a) When a 0.1000-g sample of each liquid was transferred to anevacuated 750.0-mL container and volatilized at 70.00C, sam-ple I had a pressure of 0.05951 atm; sample II, 0.07045 atm; and sample III, 0.05767 atm. What is the molar mass of each liquid?(b) Boron is 85.63% by mass in sample I, 81.10% in II, and 82.98% in III. What is the molecular formula of each sample?(c) Sample IV was found to be 78.14% boron. Its rate of effusion was compared to that of sulfur dioxide and under identicalconditions, 350.0 mL of sample IV effused in 12.00 min and250.0 mL of sulfur dioxide effused in 13.04 min. What is the mo-lecular formula of sample IV?"Nitric acid reacts with S to give H2SO4 and nitrogen monoxide. 30 ml of acid at 25% by mass and a density of 1.08 g/ml with 5 g of S. a) Adjust the reaction. b) Calculate limiting reactant and its excess. c) Calculate mass of unreacted reactant. d) Determine volume of NO at 600 mm Hg and 20°C. 20% yield"THE EQUATION THEY PROVIDE IS:2HNO3 + S → H2SO4 +2NOYOU DONT NEED TO ADD H20 IN THE EQUATION
- The best laboratory vacuum pump can generate a vacuum of about 1 x 10⁹ Torr. At 25° C and assuming that air consists of N₂ (MW = 28 g/mol) molecules with a collision diameter of 3.95 x 10-¹0 m, calculate: 18912 (1) (ii) (iii) the mean speed of the molecules, the mean free path, the collision frequency in the gas.Why do some small bridges have weight limits that depend on how many wheels or axles the crossing vehicle has?One of the chemical controversies of the nineteenth century concerned the element beryllium (Be). Berzelius originally claimed that beryllium was a trivalent element (forming Be3+ ions) and that it gave an oxide with the formula Be2O3. This resulted in a calculated atomic mass of 13.5 for beryllium. In formulating his periodic table, Mendeleev proposed that beryllium was divalent (forming Be2+ ions) and that it gave an oxide with the formula Be2O3. This assumption gives an atomic mass of 9.0. In 1894, A. Combes (Comptes Rendus 1894, p. 1221) reacted beryllium with the anion C5H7O2and measured the density of the gaseous product. Combess data for two different experiments are as follows: I II Mass 0.2022 g 0.2224 g Volume 22.6 cm3 26.0 cm3 Temperature 13C 17C Pressure 765.2 mm Hg 764.6 mm If beryllium is a divalent metal, the molecular formula of the product will be Be(C5H7O2)2; if it is trivalent, the formula will be Be(C5H7O2)3. Show how Combess data help to confirm that beryllium is a divalent metal.
- 6 Hayden-McNeil Login C What Is The Volume (in L) Of Ca x 101edu.co Question 31 of 59 When chromium metal is added to nitric acid, the following reaction takes place Cr (s) + 6 HNO, (aq) Cr(NO,)a (aq) + 3 H,0 (1) + 3 NO, (g) Calculate the volume of NO, gas collected over water at 40.0 °C when 37.5 g of chromium is added to excess nitric acid if the total pressure is 675 torr. The vapor pressure of water at 40.0 °C is 55.3 torr. 042.) It’s a bad day in the lab! Two students are doing experiments. Each is 20 feet away from the professor. At the same time, each of them lets the same amount of a smelly gas into the room. One of them releases ammonia, NH3, and the other releases SO2. NH3 has a pungent odor, and SO2 smells like rotten eggs. The professor has no idea that this has happened, until she smell the first gas. Which chemical will the professor smell first? (NH3 or SO2) . If the professor starts to smell the first gas 42. seconds after the gas is released, how long will it take her to smell the second gas? sec. * Note: It is unsafe practice to work with these chemicals in an open lab.10:31 PM Tue Oct 12 AA www-awn.aleks.com G periodic table - Goo... Favorites - YouTube... XA ALEKS - Caliyah Hel... G kno3 acid or base -... G linear programming... G write formulas for t... C Solved A. Objective Knowledge Check Question 6 Caliyah A chemistry student weighs out 0.259 g of ascorbic acid (H,C,H,O,), a diprotic acid, into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1400M NAOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Be sure your answer has the correct number of significant digits. mL x10 Privacy Center Accessibility
