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@X@user.full_name@X@ @GMU: A gas mixture contains an unknown amount of He and 0.1944 mol of Xe. How many moles of He are there, if the total pressure is 1065.01 mm Hg and the partial pressure of He is 460.18 mm Hg?

@X@user.full_name@X@ @GMU: ACS-Using the given rate data what is the correct rate law for the reaction below?H2 + Br2 ⇋ 2HBr  Exp [H2]o [Br2]o Initial Rates, Ms-1 1 0.182 0.182 3.01 2 0.364 0.182 1.21e1 3 0.364 0.298 1.97e1

@X@user.full_name@X@ @GMU: What is the total concentration of ions in a solution consisting of 0.4784 M HClO4?

@X@user.full_name@X@ @GMU: Using bond energies from the table below, estimate ΔH for the reaction below:H2CO(g) → H2(g) + CO(g) Bond Energies, kJ/mol Single Bonds   H C N O S F Cl Br I H 432                 C 411 346               N 386 305 167             O 459 358 201 142           S 363 272 — — 286         F 565 485 283 190 284 155       Cl 428 327 313 218 255 249 240     Br 362 285 243 201 217 249 216 190   I 295 213 — 201 — 278 208 175 149   Multiple Bonds C=C 602 C=N 615 C=O 799 CºC 835 CºN 887 CºO 1072 N=N 418 N=O 607 S=O (in SO2) 532 NºN 942 O2 494 S=O (in SO3) 469

@X@user.full_name@X@ @GMU: ACS-What mass of gold would be plated on an electrode from a solution of Au(NO3)3 at a current of 5.00 A for 362.49 s?

@X@user.full_name@X@ @GMU: The density of a particular gas is 5.7721 g/L at 801.07 mm Hg and 19.01 °C. Which gas is it?

@X@user.full_name@X@ @GMU: What is the standard cell voltage at 25.0oC for the reaction below?Sn4+(aq) + Co(s) → Sn2+(aq) + Co2+(aq) K = 3.50e14

The complete combustion of cyclohexane, C6H12, yields carbon dioxide and water as products (see reaction below). __C6H12 + __O2 ↔ __CO2 + __H2O The ratio of the number of molecules of O2 required to molecules of cyclohexane is

@X@user.full_name@X@ @GMU: ACS-Using the given rate data what is the correct rate law for the reaction below?(CH3)3CBr(g) + OH- ⇋ (CH3)3COH + Br-  Exp [(CH3)3CBr]o [OH-]o Initial Rates, Ms-1 1 0.169 0.169 7.44e-5 2 0.338 0.169 1.49e-4 3 0.338 0.221 1.49e-4

@X@user.full_name@X@ @GMU: Determine the rate of formation of I2 if the initial concentration of IO3− was 0.4644 M and decreased to 0.3827 M after 0.2167 hours. Use the reaction below.IO3− + 5I− + 6H+ → 3I2 + 3H2O