Friday

February 12, 2016
Number of results: 21,391

**ut**

The acidity constant of acetic acid is 1.8 × 10-5. Calculate the % error of the measured Ka value.
*October 31, 2013 by Anonymous*

**brief calc**

p = 8 − 2q1/3; p = 6 same as before calculate surplus
*December 4, 2013 by kyle *

**chemistry**

calculate the percentages by mass of the component element in sodium trioxonitrate(v)
*January 28, 2014 by sam*

**Chemistry**

How do I calculate moles from the given litres and mass of the substance (in grams)?
*February 23, 2014 by Anonymous*

**Chemistry**

How do I calculate moles from the given litres and mass of the substance (in grams)?
*February 23, 2014 by Anonymous*

**Chemistry**

Calculate [OH−] for 1.90mL of 0.190M NaOH diluted to 1.50L .
*February 25, 2014 by JJ*

**Algebra**

what is the formula used to calculate the surface area for a square pyramid?
*March 4, 2014 by Steve*

**Algebra**

what is the formula used to calculate the lateral area for a square pyramid?
*March 4, 2014 by Steve*

**Chemistry**

The Ksp of manganese (II) hydroxide, Mn(OH)2 is 2.00x10^-13. Calculate the solubility of this compound in g/L?
*March 25, 2014 by Joe*

**Chemistry**

he Ksp of mercury(II) hydroxide, Hg(OH)2, is 3.60 × 10-26. Calculate the solubility of this compound in g/L. I came up with x=2.8*10^-13
*March 26, 2014 by Nickcole Jackson*

**Chem Help!**

use the solubility product for Fe(OH)3 to calculate the pH at which Fe(OH)3 begins to precipitate from a 0.20 M Fe^3+ solution
*April 9, 2014 by Anonymous.*

**chemistry**

Calculate the amount of CO2 formed when 50 grams of CaCO3 decomposes?
*May 2, 2014 by jill*

**Chemistry**

calculate the heat liberated when 15.0 g glucoseis metabolized to CO2 and H2O
*May 14, 2014 by Anonymous*

**assessment**

What statistical technique is often used to calculate an estimate of reliability?
*June 4, 2014 by Anonymous*

**chem school**

calculate the volume of 2.04 m al l oh 3 needed to neutralize 22.0 ml of 880m h2so4
*June 24, 2014 by Ali*

**Math**

The first three terms of an arithmetic progression are t, 2t-1, 2t+4. Calculate the value of t.
*July 2, 2014 by Christopher*

**math**

A section of the highway rises 15 feet in a mile, calculate the grade.
*July 13, 2014 by Diane*

**science**

Calculate the volume of a graduated cyclinder that has a radius of 10 mm and a height of 120 mm.
*July 15, 2014 by Ben*

**Chemistry**

Calculate the maximun=m mass of ethanol that can be made from 5.6 tonnes of ethen
*July 28, 2014 by Alex*

**Economics**

can someone teach me how to calculate per unit opportunity cost
*August 23, 2014 by jake*

**chemistry**

Calculate the number of moles of O atoms in a 2.5x10(-6)kg sample of C8H10N4O2
*September 20, 2014 by frank*

**Gonzaga**

Calculate the amount of heat released when 65.6 g of water at 55.5°C cools to ice at 0.0°C.
*September 22, 2014 by Brendan*

**chem**

mole fraction of CHOHCH in H2O calculate molality of solution
*October 23, 2014 by beza*

**Physics **

If the speed of the wave is 330 per sec calculate the wavelength
*November 15, 2014 by Sech*

**Chemistry **

Calculate the energy (kJ) required to raise the temperature of 22g of water from 12 C to 90 C.
*November 23, 2014 by Amanda*

**Chemestry**

Calculate the density of an object with a mass of 2.14g and a volume of 11.40mL.
*December 1, 2014 by Ashlee*

**Chemistry**

'calculate the mass in amu of 2.879 1023 xenon atoms'
*December 6, 2014 by Teresa*

**chemistry(ppm parts per million)**

How would i calculate 2.34 mg x 10^6 divided by 3.50 kg
*December 15, 2014 by winnie*

**chemistry**

calculate the mass of Pbl2 produced by reacting of 30.0g Kl with excess Pb( NO3)2
*January 15, 2015 by jorie*

**Chemistry**

Calculate the mass of a 0.253-mL sample of a liquid with density 0.789 g/mL
*January 21, 2015 by Drea*

**Chemistry**

Calculate the pH and concentration of H3O+ of a 0.285M oxalic acid solution.
*January 22, 2015 by Kat*

**Physics **

Calculate the acceleration of a plane when it changes its speed from 0m/s to 250m/s in 12 seconds
*February 16, 2015 by Jinish*

**AP CHEM**

A solution formed by mixing 13.0 mL of 0.013 M Ba(OH)2 with 31.0 mL of 7.0 ✕ 10-3 M NaOH. Calculate [OH-]
*February 17, 2015 by Jordyn*

**science**

Calculate the ph of a buffer solution containing 0.2M NH4OH and 0.25M NH4Cl kb=1.8×10
*February 18, 2015 by rupesh*

**chemistry**

how do I calculate rate velocity using absorbence at 412/ min-1.
*February 22, 2015 by de1*

**biochemistry**

how do I calculate rate velocity using absorbence at 412/ min-1.
*February 22, 2015 by de1*

**chemistry**

how to calculate nuclidic mass of 3He when its binding energy is 0.76 MeV
*February 23, 2015 by nithya*

**Economics**

Calculate the mean, median, mode of the following set of numbers:21,22,23,24,25,26,23,28,29,30,,24,31,34,28
*February 25, 2015 by Tutu*

**science**

Calculate the concentration of all species in a 0.145M solution of H2CO3
*March 18, 2015 by Kris*

**Chemistry**

Calculate the solubility of silver chloride in a solution that is .170M in NH3
*March 30, 2015 by Gabby*

**Chemistry**

Calculate the value of ΔS when 1.10mol of Br2(l) is vaporized at 58.8 ∘C
*April 2, 2015 by Austin*

**chemistry **

calculate the solubility in grams of KCL3(s) per 100 ml of water
*May 10, 2015 by emily *

**chemistry**

109% of carbon,18,2% of hydrogen and 73% of oxygen how do i calculate emperical formular?
*May 27, 2015 by happy*

**Science**

Calculate the energy of a photon of ultraviolet light of wavelength 200nm
*June 1, 2015 by Tebogo*

**college chemistry**

Calculate the molarity (M) of 156.2g of H2SO4 in 1.275L of solution.
*June 16, 2015 by Alicia Estrada*

**Science**

mg +2Hcl --MgCl2. + h2 Calculate minimum volume of 0.1ml\L Please help
*June 19, 2015 by Sarah*

**Science**

mg +2Hcl --MgCl2. + h2 Calculate minimum volume of 0.1ml\L Please help
*June 19, 2015 by Sarah*

**eua high school**

How can i calculate the surface area of a graph with the equation y=2x^2-8
*August 11, 2015 by ūiūķ*

**algebra**

How do you calculate the rate of 40 cars parked in 6 rows in a parking lot
*September 1, 2015 by Anonymous*

**nnkc**

Calculate the amount of heat required to convert 15 gm water at 100
*September 5, 2015 by Anonymous*

**Chemistry**

Calculate the amount of hydrochloric acid in 25cm3 of 0.100M HCl
*September 14, 2015 by Jess*

**PIMA**

Calculate Cholestyramine 20% ointment to make 100 gm. Base: Petroleum
*September 28, 2015 by Johnson*

**barberton tvet ,science **

calculate the maximum height reached by the bullet
*October 18, 2015 by sipho*

**swagodimo**

Calculate the number of moles of hcl(aq)added to sodium thiosulphate
*November 15, 2015 by peter*

**chemistry**

Calculate the energy difference for the transition of n=6 to n=2 for 1.00 mol of hydrogen atom?
*October 25, 2015 by gega*

**science**

Calculate 1A.U.if it takes 8,3 minutes for light to travel that far (c=300000 km/s)
*October 27, 2015 by Duncan fourie *

**Chemisty**

the Keq of Mg(OH)2 is 2(10^-11). calculate the concentration of Mg ions in a saturated solution of this compound
*November 19, 2015 by Julian*

**conversions**

How to calculate the square meters of a roll that is 30500 LF x 117" x 75 gauge
*November 20, 2015 by Kevin*

**phyics**

Calculate the specific gravity of a liquid given the following information: m = 59.30 g, mA = 33.78 g, mL = 43.60 g.
*November 23, 2015 by Kim*

**math**

calculate the mass of cube which has a density of ,1000kg/m^3 and side of length 2m
*December 1, 2015 by mamusu*

**Biochem**

Calculate the pH of the buffer system of 0.20M K2HPO4/0.25M KH2PO4
*December 3, 2015 by Yeah*

**chemistry**

Calculate the molarity of a 6% solution of ammoniun nitrate of density 1.025 g/mL
*December 7, 2015 by derek*

**HILLSIDE**

Calculate the price elasticity of demand between $110 and $130.
*December 7, 2015 by RASHAWN*

**Chemistry**

the ka value of 0.001moldm-3 solution of a weak acid is 1.6*10-6 calculate the ph and the pka
*February 9, 2016 by Archie*

**Chemistry, #7**

The pH of a 1.00 x 10^-3 M solution of pyrrolidine is 10.82. Calculate Kb. I know pyrrolidine is acidic because of the pH, and I know that tells me something about the Ka which in turn tells me something about the Kb. What does it tell me? Where should I begin this problem? Do...
*August 5, 2007 by Taasha*

**Chemistry**

I'm working on a problem that says: A 4.00 gram sample of a mixture of CaO and BaO is placed in a 1.00 L vessel containing Co2 at a pressure of 730 torr and a temperature of 25C. The CO2 reacts with the CaO and BaO forming CaCO3 and BaCO3. When the reaction is complete, the ...
*August 12, 2015 by Zara*

**Chemistry Lab **

I need help with the third part The chemical method of analysis in determination of the blood alcohol content (%BAC) is: K2Cr2O7 + H2SO4 + C2H5OH → Cr2(SO4)3 + K2SO4 + CH3COOH + H2O What are the stoichiometric coefficients for the reaction above? (please enter the ...
*December 4, 2012 by Terry*

**Chemistry**

The kinetic energy of a rolling billiard ball is given by {\rm{KE}} = 1/2\,mv^2 . Suppose a 0.17-{\rm kg} billiard ball is rolling down a pool table with an initial speed of 4.5 m/s. As it travels, it loses some of its energy as heat. The ball slows down to 4.0 m/s and then ...
*October 9, 2009 by Katherine*

**Bule hora preparatory school**

An ideal gas is sealed within a container at a tempreture of 17 degree celcies and a pressure of 101KPa. The container is heated until the tempreture of the gas reaches 100 degree celcies. A valve in the container is then opened to allow gas to escape until the pressure falls ...
*October 14, 2015 by Bilisuma hussein*

**chemistry**

Can you check what I did below? On the first problem, I am not sure if I am suppose to add a negative to the first part of the heat loss of water like so -[C(sp)m(w)deltaT(w)]. On the second problem, part(a), I am not sure if I am using the mass from the first problem, 135g, ...
*July 19, 2008 by Anonymous*

**Microeconomics**

A sporting goods store has estimated the demand curve for a popular brand of running shoes as a function of price. Use the diagram to answer the questions that follow. a. Calculate demand elasticity using the midpoint formula between points A and B, between points C and D, and...
*August 7, 2010 by Monica*

**chemistry**

A drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of "40m2". Assume that the oil film has a uniform thickness equal to the diameter of a oil molecule. Calculate the diameter of an oil ...
*March 9, 2007 by angel*

**E.I.S.J**

An ideal gas is sealed within a container at a tempreture of 17 degree celcies and a pressure of 101KPa. The container is heated until the tempreture of the gas reaches 100 degree celcies. A valve in the container is then opened to allow gas to escape until the pressure falls ...
*October 31, 2015 by zizo breezy*

**statistics**

You randomly choose 16 unfurnished one-bedroom apartments from a large number of advertisements in your local newspaper. You calculate that their mean monthly rent is $613 and their standard deviation is $96. Does this SRS give good reason to believe that the mean rent of all ...
*November 19, 2013 by arshi*

**math**

You randomly choose 16 unfurnished one-bedroom apartments from a large number of advertisements in your local newspaper. You calculate that their mean monthly rent is $613 and their standard deviation is $96. Does this SRS give good reason to believe that the mean rent of all ...
*November 19, 2013 by arshi*

**CHEMISTRY**

You mix 40.0 g of ethanol (C2H5OH, molecular weight = 46.1 g/mol) and 60.0 g of water (molecular weight = 18.0 g/mol) The resulting solution has a density of 920 g/L. a)Calculate the molarity of ethanol in this solution? Answer : 0.06 kg of H2O This is correct. b) At what ...
*March 18, 2012 by Jen*

**A2 Chemistry**

This question is about the unnecessary production of carbon dioxide Outdoor flames, such as patio heaters and the Olympic flame, contribute to global warming. This is not only due to the heat released, but also due to the carbon dioxide produced from the combustion of ...
*February 11, 2013 by Chris*

**Physics**

The bacterium Escherichia coli (or E. coli) is a single-celled organism that lives in the gut of healthy humans and animals. When grown in a uniform medium rich in salts and amino acids, these bacteria swim along zig-zag paths at a constant speed of 20 um/s. The figure shows ...
*September 11, 2012 by Cassie*

**Chemistry**

I have a few question for my review. 1) How would you prepare 30.0 ml of 0.600M HNO3 From a stock solution of 4.00M HNO3? What volume in ML of the 4.00 M HNo3 will you need? 2) if a 83.5 & was repoarted for a reaction that could have produced 12.1 g of product? what was the ...
*October 10, 2013 by Matt*

**PHYSICS**

A nuclear reactor contains nuclei that fission when bombarded by slow neutrons. The fission reaction produces fast neutrons which need to be moderated (i.e. slowed down) in collisions before they can cause further fissions. In this problem we consider a reactor which uses ...
*March 28, 2011 by Megan*

**Physics- drwls please help**

(a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year is about 9.33 109 J. (...
*March 28, 2007 by Jim*

**Chemistry**

An element has bcc packing with a body-centered cubic unit cell. Its density is 19300 kg/m3 and the unit cell volume is 3.17 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures. The element rubidium has bcc packing with a body-centered cubic...
*February 8, 2010 by Dan*

**Chemistry**

I am stuggling with my chemistry experiment. I am given thr following: The reaction of citric acid and sodium bicarbonate is written as H3C6H5O7(aq) + 3NaHCO3(aq) --> Na3C6H5O7(aq) + 3H2O(l) + 3CO2(g) 1.) Mass of cup A, water, and stirrer = 54.3 g 2.) Mass of sodium ...
*November 7, 2012 by Bailey*

**Chemistry (please help me!)**

H2(g) + CO2(g)<-> H20(g) + CO(g) When H2(g) is mixed with CO2(g) at 2,000K, equilibrium is achieved according to the equation above. In one experiment, the following equilibrium concentrations were measured: [H2]=0.20 M [CO2]=0.30 M [H2O]=[CO]=0.55M a) What is the mole ...
*February 25, 2007 by sara*

**chemistry**

Calculate the pH from the addition of 10 mL of a 0.10 M NaOH solution to 90 mL of 0.10 M HCl. okay so i understand how to do most of it but i get messed up at one part.. so i made my equation: NaOH + HCl -> H2O + NaCl (strong base, strong acid= complete dissociation) so net...
*November 8, 2011 by BOB PLEASE HELP!:)*

**Math**

The speedometer of John's truck uses the revolutions of his tires to calculate the speed of the truck. How many revolutions per minute do the tires make when the truck is traveling at 55 miles per hour? (picture with tires with diameter of 26 in.) Suppose John buys tires with ...
*May 11, 2011 by Gabi*

**PLEASE HELP!**

A city planner is working on the redesign of a hilly portion of a city. An important consideration is how steep the roads can be so that even low-powered cars can get up the hills without slowing down. It is given that a particular small car, with a mass of 1110 kg, can ...
*October 1, 2006 by Haley*

**Chemistry**

I am a bit lost as to how to go about answering this question. Any help will be appreciated. When 1.40g of hydrated magnesium sulphate is heated to constant mass, 0.68g of the anhydrous salt remains. Find the formula for the hydrated magnesium sulphate. Write the balanced ...
*March 21, 2007 by Nona*

**Finance**

2.Calculate the growth rate of Asset J dividends, we have to assume that future dividend payments will grow at a constant rate into the future forever. This constant rate can be estimated by calculating the average growth rate from the past dividends. Calculate Asset J’s ...
*September 19, 2014 by no name*

**Geometry**

Within an orthonormal system consider points A(1,4) B(5,1) C(4,8) (a)Calculate the angle ABC (b)Show that 3x+4y-19=0 is an equation for line L which passes through A and B (c)Find a vector equation for line L (d)(i)give an equation for the circle with the line segment AB as ...
*May 4, 2008 by Anonymous*

**Physics - Quidditch**

A light rope passing over a frictionless pulley connects two objects. One object has a mass of 10kg. The tension in the rope is 90N. Calculate the acceleration and the mass of the second object. Object 1 Fg-Ft = ma 100 - 90 - 10*a 10/10 = a a = 1m/s^2 Object 2 Ft-Fg = ma 90-...
*April 2, 2008 by Alex*

**Math 141**

You find that a small business loan in the amount of 50,000 is the amount you need to purchase the restaurant location. After researching banks to find the best interest rate, you find that banks for small businesses offer the best interest rate of 9% interest that compounds ...
*March 27, 2012 by Sherry*

**CTU**

Part IV: You find that a small business loan in the amount of 50,000 is the amount you need to purchase the restaurant location. After researching banks to find the best interest rate, you find that banks for small businesses offer the best interest rate of 9% interest that ...
*August 13, 2012 by Johjoh*

**computer science**

Can you find the reason that the following pseudocode function does not return the value indicated in the comments? // The calcDiscountPrice function accepts an item’s price and // the discount percentage as arguments. It use those // values to calculate and return the ...
*November 21, 2012 by Terry*

**College (Enthalpy) - College**

S(rhombic)+O2(g)--->SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)--->SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)-->S(monoclinic) Our goal is to calculate the enthalpy change for the ...
*October 31, 2010 by Lucy*

**math**

In a factory of electronic items, the total cost of production, expressed in thousands of dollars, is given by the function C(x)= (x^2-x+2)/x+1 where x belongs to [0;5] and expressed in hundrends of items produced. 1) calculate in dollars the total cost of production of 400 ...
*January 1, 2011 by Jessy*

**Physics**

3) a) Calculate the unstretched length of a spring, which has a Hooke's constant of 40N/m and is 56cm long when supporting a stationary 800g object. I did mag = kx (0.800)(9.81) = 40x x = 0.20m l-x = u 56-20 = u u = 36cm Is that right? b) The period with which the object would...
*May 19, 2008 by Alex*

**mechanics**

Use a sketch to illustrate what cantilever bending is and give an everyday example of it. (b) use a sketch to illustrate what three-point bending is and give an everyday example of it. (c) For each of the two beams shown below: (i) calculate the maximum magnitude of the ...
*February 24, 2013 by dmkp*

**physics HELP!!**

3. A rocket car is traveling on a linear horizontal frictionless track when it suddenly runs out of fuel. The car has achieved a speed of 100 meters per second at the very moment the fuel is completely spent. The track then suddenly changes to a 30-degree incline from the ...
*February 20, 2007 by Katrina*

**Programming**

1.Do the planning and write an algorithm to solve the following problem. Prepare test data for the example to test all possibilities and draw a trace table. Sam works at a coffee company where all the employees receive a bonus of R700, except the employees in the coffee ...
*March 30, 2015 by Anonymous*