Let 4 moles of methanol (liquid) combust in 3 moles of gaseous oxygen to form gaseous carbon dioxide and water vapor. Suppose this occurs in a chamber of fixed volume and fixed temperature. If the original pressure is 1.0 atm, what is the final pressure in the chamber. Express your answer in atm. Enter only a numerical value, do not enter units. Assume liquids take up negligible volume.
In: Chemistry
Materiality (AU-C 320, AS 2105) – Materiality in Planning and Performing an Audit Using the 12/31/14 Apollo trial balances calculate preliminary materiality for the financial statements as a whole using the following approaches: 5.0% of pre-tax income 0.5% of total assets 1.0% of equity 0.5% of total revenues Based on your engagement planning analysis, which preliminary materiality measure would you recommend?
In: Accounting
A cylinder of height 10 cm and cross sectional area of 1 cm2 is submerged inside two immiscible liquids of specific gravity 1.1 and 1.0 respectively.
The cylinder is in equilibrium in such a way that 5 cm of its height is submerged in the bottom liquid and 2 cm above the surface of the two liquids.
In order the cylinder to be completely submerged inside the two liquids find the value of the mass of an object that needs to be kept on the cylinder.
In: Physics
to a 100.0 mL volumetric flask are added 1.00 mL volumes of three solutions: .0100 M AgNO3, .205 M NaBr, and .100 M NaCN. The mixture is diluted with deionized water to the mark and shaken vigerously. What mass of AgBr would precipitate from this mixture? Hint: The Ksp of AgBr is 5.4 x 10-13 and the Kf of Ag(CN)2- is 1.0 x 10^21
In: Chemistry
| reagent | Molecular Weight | Gram | mmol | equivalents | d | mL |
| hydroquinone | 110 | 1.0 | xxxx | xxx | ||
| acetic anhydride | 102 | 1 | 3.1 | 1.08 | ||
| phosphoric acid | 98 | 1.85 | 0.05 | |||
| THEORETICAL PRODUCT | XXXXXXXXXXX | XXXX | XXX | XXXXXXXX | xxxxx | XX |
| 4-(acetyloxy) phenylacetate | xxxxxxxxxx | xxxx | xxxx | |||
| acetic acid | xxxxxxxxxx | 1.049 |
Please show step by step solution. Thanks!
In: Chemistry
Many different ways have been proposed to make batteries. One cell is set up with copper and lead electrodes in contact with CuSO4(aq) and Pb(NO3)2 (aq), respectively. If the Pb2+ and Cu2+ concentrations are each 1.0 M, what is the overall cell potential?
Pb2+ + 2e- ---> Pb E = -0.22 V
Cu2+ + 2e- ----> Cu E = +0.34 V
answer: 0.56 V. how?
In: Chemistry
You are 9.0 m from the door of your bus, behind the bus, when it pulls away with an acceleration of 1.0 m/s2. You instantly start running toward the still-open door at 5.1 m/s.
A)How long does it take for you to reach the open door and jump in?
B) What is the maximum time you can wait before starting to run and still catch the bus?
In: Physics
Dinitrogen pentoxide (N2O5) decomposes in chloroform as a solvent to yield NO2 and O2. The decomposition is first order with a rate constant at 45 ∘C of 1.0×10−5s−1.
Calculate the partial pressure, in atm, of O2 produced from 1.15 L of 0.592 M N2O5 solution at 45 ∘C over a period of 24.3 h if the gas is collected in a 12.1-L container. (Assume that the products do not dissolve in chloroform.)
In: Chemistry
A battery is constructed based on the oxidation of magnesium and the reduction of Cu2+. The initial concentrations of Mg2+ and Cu2+ are 1.1×10−4 M and 1.6 M , respectively, in 1.0-liter half-cells.
PART A: What is the initial voltage of the battery?
PART B: What is the voltage of the battery after delivering 4.7 A for 8.0 h ?
PART C: How long can the battery deliver 4.7 A before going dead?
In: Chemistry
Imagine you are the orbital engineer for the first NASA space shot to Ceres, the largest known asteroid. Ceres’s nearly circular orbit around the sun has a radius of R = 2.77 AU. After being launched from the earth, the probe will initially be in a circular orbit around the sun with the same radius (r_{c} = 1.0 AU) and the same orbital speed (|\vec{v}_{c}| = 6.28 AU/y) as the earth’s orbit. The probe’s rocket engines will then fire briefly to increase the probe’s speed to that speed |\vec{v}_{c}| needed to put the probe into an elliptical orbit whose initial (and minimum) distance from the sun is r_{c} = 1.0 AU and whose final (and largest) distance from the sun is R = 2.77 AU (this is a Hohmann transfer orbit).(a) How long will it take the probe to get from the earth to Ceres in such an orbit? (b) What is the speed |\vec{v}_{c}| that the probe has to have just after firing its engines to be inserted into this orbit? (Assume the duration of the boost is short enough that its distance from the sun is still nearly r_{c} just after the engines have been fired.)
In: Physics