Posts by gloria
Total # Posts: 273
At 3745°C, K = 0.093 for the following reaction. N2(g) + O2(g) equilibrium reaction arrow 2 NO(g) Calculate the concentrations of all species at equilibrium for each of the following cases. (a) 2.0 g N2 and 3.0 g O2 are mixed in a 1.3-L flask. [N2] [O2] [NO] (b) 1.5 mol ...
February 27, 2017
U.S. History (help)
In the U.S. House of Reps. When California gains a representative, then another state must have what? How often can the number of representatives be adjusted? After a what?
February 15, 2017
A spherical balloon is inflated so that its volume is increasing at the rate of 3.2 ft3/min. How rapidly is the diameter of the balloon increasing when the diameter is 1.1 feet?
January 25, 2017
English,sepedi,agriculture,economics,lifesciences,maths literacy & life orientation
Identify 3human rights violations or discrimination and explain in an introductory paragraph why you choose the specific human rights violation or discrimination
April 16, 2016
A block is attached to a spring and set in motion on a horizontal frictionless surface by pulling the block back a distance 10cm from equilibrium. Now, replace the block with one double the mass and set the block into motion again by pulling the block a distance 10cm from ...
April 13, 2016
Write a 700- to 1,050-word essay in which you complete the following: Give a brief introduction that identifies the issue you have chosen and why.Describe in three separate paragraphs how each perspective would view or explain the issue.Include in your analysis elements ...
December 6, 2015
The mean age at which men in the United States marry for the first time follows the normal distribution with a mean of 24.4 years. The standard deviation of the distribution is 2.6 years. For a random sample of 57 men, what is the likelihood that the age at which they were ...
July 18, 2015
you walk west for 52 m, then you walk 33.2° north of west for 44 m, and finally you walk due north for 25 m. Find the components of your final displacement, from your initial to final point, along the north and west directions.
May 21, 2015
The following unbalanced equation describes the reaction that can occur when (II) sulfide reacts with oxygen gas to produce lead (Il) oxide and sulfur dioxide gas: PbS+O2---> PbO + SO2 Balance the equation and describe in words the electron transfers that takes place.
May 8, 2015
Consider this statement: "QuickBooks records revenue when an invoice is generated, even though cash has not been received." Is this practice acceptable? Why or why not? What are noncash investing and financing activities, and how are they recorded in QuickBooks?
March 9, 2015
A grocery store sells four different jars of peanut butter. Determine which is the best? buy, based on the cost per unit. 14 ounce for$1.71 28 ounce for $2.94 24ounce for $2.57 34 ounce for$3.30
June 3, 2014
you have a metal tank containing 74.0moles of nitrogen gas at a pressure of 15.0atm.If the pressure is measured at a temperature of 20.0c,then the volume of the tank must be how many liters(Round answer to one decimal place.
February 12, 2014
Patterns,Algebra ans Functions
This line represents the line on a graph tha shows how long it took Khalil to walk to school.The horizontal axis shows the time and the vertical axis shows blocks covered.Explain what you think happened on Khalil's way to school?
January 22, 2014
mary smith purchased a new car for $28,750. she made a 15% down payment and financed the balance at her bank for 3 years. what payments are required at the end of every month, at 18% interest, to pay off the loan?
December 16, 2013
asking for a teacher's opinion
Do you think rounding borderline letter grades up or down is a fair practice? Or should they just stay where they are? For example, I think that an 89.5% should round up to a 90%. I have one instructor right now who considers an 89.99% to still be a B plus. It seems a bit ...
December 6, 2013
If motor M exerts a force of F=(10t2+100)N on the cable, where t is in seconds, determine the velocity of the 25kg crate when t=4s . The coefficients of static and kinetic friction between the crate and the plane are μs=0.3 and 0.25 μk=0.25 . The crate is initially ...
November 7, 2013
I am trying to help my grandson with a fraction problem, Mary has 12 marbles 3/12 are yellow,2/12 are blue and the rest are green, I need to explain how many of them are green where he will understand
October 28, 2013
I did the next problem, i don't have the results for it and i just want to know if i calculated the mass for Fe2O3 the right? A sample is a mixture of iron oxides (Fe2O3 and FeOOH). It's known that at 200°C this reaction occurs: 2FeOOH(s)-> Fe2O3(s) + H2O(g) A 0...
September 7, 2013
What is a pH of 20 mL of 0.08 M NH3 added to 40 mL of 0.04 M HCl? NH3 + HCl = NH4+ + Cl- c(NH3)=(0.02L * 0.08M)/0.06L= 0.02667 M c(HCl)=(0.04L * 0.04M)/0.06L= 0.02667 M c(NH4+)=c(HCl) Kb=[NH4+][OH-]/[NH3] Kb=1.76*10^(-5) So i tried to calculate it like this: Kb=[OH-] pOH=4....
September 2, 2013
you will have to use this two formulas p*V=n*R*T n=m/M p*V=(m/M)*R*T p*V*M=m*R*T M=(m*R*T)/P*V then just make sure you convert units right (i hope i did convert them right, if not then correct me) M=(0.311g*8.314L kPa*328.15K)/(mol*K*118.124 kPa*0.225L) M=31.924 g/mol
August 4, 2013
First of all, thank you so much for answering and i'm sorry for writting all the problems at once. I won't do that anymore in the future. #5 i was looking at the different problem with my result, that's why i wrote the concentration :S #9 thank you, i just realized...
August 3, 2013
Below i wrote a few problems, i did them all but in the book i don't have results, so i don't know if i did them right or not. I would really appreciate if someone would go through the problems and tell me if i got the right results. If i made a mistake somewhere ...
August 3, 2013
The iron in a 0.6656 g ore sample was reduced quantitatively to the +2 state and then titrated with 26.753 g of KMnO4 solution. Calculate the percent Fe2O3 in the sample. the mass i get for fe2o3 is too big, but i don't know how else to do this problem, someone please help...
August 3, 2013
A Kjeldahl analysis was preformed upon a 0.055 g sample of impure biguanide (C2H7N5, fw=101.1). The liberated ammonia, collected in 40 mL of 4% boric acid was titrated with 19.51 mL of 0.1060 M HCl. Calculate the percentage of biguanide in the sample. (Result: 76%) This is how...
August 1, 2013
A dilute perchloric acid solution was standardized by dissolving 0.2445 g of primary standard sodium carbonate in 50 mL of the acid, boiling to eliminate CO2, and back-titrating with 4.13mL of dilute NaOH. In a separate titration a 25mL portion of the acid required 26.88 mL of...
August 1, 2013
A 5ml portion of table wine was diluted to 100 ml in a volumetric flask. The ethanol in a 20 ml aliquot was distilled into 100 ml of 0.05151M K2Cr2O7. heating completed oxidation of the alcohol to acetic acid: Ch3Ch2OH + 2Cr2O7(2-) +16H(+) -> 3Ch3COOH + 4Cr(3+) + 11H2O ...
July 30, 2013
A 25 ml sample of household bleach was diluted to 500 ml in a volumetric flask. An unmeasured excess of potassium iodide was aded to a 20 ml aliquot of the diluted sample; the iodine liberated in the reaction: OCl- + 2I- -> I2 + Cl- + H2O required 34.5 ml of 0.0409 M ...
July 30, 2013
.working almost 50 hours per week. .working on holidays without extra remuneration. .working during lunch break in order not to lag behind with the work. .going to work when you are ill. .giving some employees a work wich is not their duties.
March 7, 2013
When 50.0g of silicon dioxide is heated with an excess of carbon 32.2 g of silicon carbide I'd produced. SiO2(s) + 3C(s) → SiC(s) + 2CO(g) A. What is the percent yield of this reaction? B. How many grams of CO gas are made?
January 7, 2013
Nitric acid and zinc react to form zinc nitrate, ammonium nitrate, and water. 4Zn(s) + 10HNO3(aq)→ 4Zn(NO3)2(aq) + NH4NO3(aq) + 3H2O(l) A. How many atoms of zinc react with 1.49g HNO3? B. Calculate the number of grams of zinc that must react with an excess of HNO3 to ...
January 7, 2013
Three people who work full-time are to work together on a project, but their total time on the project is to be equivalent to that of only one person working full-time. If one of the people is budgeted for one-half of this time to the project and a second person for one-third ...
December 8, 2012
a car that weights 15000 N is initially moving at 60 km/hour when the brakes are applied. The car is brought to a stop at 30 meters. Determine the magnitude of the braking force
November 14, 2012
adverbs and other parts of speech
This question is based on the following paragraph. (1) Brenda would have liked to have taken her vacation at the beach. (2) However, the weather forecast on the television called for rain. (3) Also, her fiancé, Max, wanted to vacation in the mountains. (4) After a ...
November 14, 2012