Wednesday

April 23, 2014

April 23, 2014

Number of results: 22,477

**Chemistry**

Calculate moles H2O. Calculate moles EtOH. Calculate XH2O Calculate XEtOH. Calculate pH2O Calculate pEtOH. Total P = pH2O + pEtOH
*Sunday, February 19, 2012 at 6:45pm by DrBob222*

**Statistics for Business**

Consider the following sample of data: 11.2, 28.4, 32.6, 17, 13.5, 2.2, 38, 41.4, 1.9, 14.4, 21.8, 23.8 a) Calculate the max, min, Q1, median, and Q3 b) Calculate the average c) Calculate the standard deviation d) Calculate the variance
*Sunday, January 19, 2014 at 8:24pm by thomas*

**Math: Probablity**

A penny, a nickel, and a dime are flipped at the same time. Each coin can come out either heads (H) or tails (T). a. What name is given to the act of flipping the coins? b. There are eight elements in the sample space (i.e., HHH,THT, etc.). List all eight outcomes. c. How many...
*Saturday, February 15, 2014 at 6:14pm by Anonymous*

**Chem Lab**

Calculate the weight of the water lost by heating. Calculate the percentage of water in the hydrate. Calculate the number of moles of H2O lost by heating. Calculate the number of moles of anhydrous salt. Enter the formula of the hydrated salt. Calculate the theoretical ...
*Monday, October 8, 2012 at 10:37pm by Aliya*

**Chemistry**

You have the standard. Calculate the concn of the complex. Then use Beer's Law to calculate the constant a, in A = abc. You know A, you know b(the cell length) and you know c. Calculate the constant a. Then go to the unknown. You have A, you have a from the previous ...
*Thursday, April 10, 2008 at 12:42am by DrBob222*

**Chem Lab**

Calculate the weight of the water lost by heating. These are the other post lab questions Calculate the percentage of water in the hydrate. Calculate the number of moles of H2O lost by heating. Calculate the number of moles of anhydrous salt. Enter the formula of the hydrated ...
*Monday, October 8, 2012 at 9:52pm by Aliya*

**Chem Lab**

Calculate the weight of the water lost by heating. These are the other post lab questions Calculate the percentage of water in the hydrate. Calculate the number of moles of H2O lost by heating. Calculate the number of moles of anhydrous salt. Enter the formula of the hydrated ...
*Monday, October 8, 2012 at 9:52pm by Aliya*

**physics**

1. A student is dragging a 5 kg box along the floor. He pulls on the rope with a 25 Newton force. The rope is 37 degrees above horizontal. As the box slides 10 meters, it goes from a speed of 3 m/s to a speed of 7 m/s. a.) calculate the normal force on the box b.) calculate ...
*Wednesday, January 12, 2011 at 9:03pm by Energy*

**college;Envoronmental Economics**

For each set of parameter values: - Calculate the optimal time to extract the resource - Calculate the Extraction path (Q0, Q1, etc.) - Calculate the MUC in each period - Calculate the optimal price in each period. - Graph each of these over time. You can use the spreadsheet (...
*Monday, October 27, 2008 at 2:03pm by Kimberly*

**chemistry**

How to calculate PH 1.9 = 0.0126M Why? How to calculate PH 1.8 = ? How to calculate PH 20 = ? How to calculate PH 21 = ? Pls helps me
*Sunday, August 5, 2012 at 1:09pm by Fai*

**chemistry**

When 10.0 mL of 0.012 M Pb(No3)2 is mixed with 10.0 mL of 0.030M KI, a yellow precipitate of PbI2(s) forms. a. Calculate the molarity of [Pb2+] b. calculate the initial molarity of [I-] c. On measuring the equilibrium concentration of [I-] it cam out to be 8.0 x 10^-3 M. ...
*Thursday, August 19, 2010 at 4:10pm by Anonymous*

**college physics**

Consider two vectors A = 4i - 4j and B = -i - 8j . (a) Calculate A + B. (b) Calculate A - B. (c) Calculate absolute value(A + B). (d) Calculate absolute value(A - B). (e) What is the direction of A + B? (from the +x axis) (f) What is the direction of A - B? (from the +x axis)
*Tuesday, September 28, 2010 at 1:21pm by caitlin*

**physics**

A train accelarates uniformly in a straight line at 0.3m/s^2 from rest. Calculate the velocity 15 seconds after its departure. Calculate time taken to reach 30km/h and calculate Distance covered by the train
*Sunday, April 7, 2013 at 10:16am by leslie*

**Chemistry**

A sample of carbon monoxide gas whose mass is 6.37 g is heated from 25 oC to 192 oC at a constant pressure of 4.12 bar. Calculate q (in J) for this process. I got an answer of ~1110J Calculate w (in J) for this process. I am unsure how to calculate work considering there is no...
*Tuesday, January 24, 2012 at 11:35am by David*

**college**

For each set of parameter values: - Calculate the optimal time to extract the resource - How do you find switchpoint/ transition point? - Calculate the Extraction path (Q0, Q1, etc.) - Calculate the MUC in each period - HOW DO U FIND MUC? - Calculate the optimal price in each ...
*Monday, October 27, 2008 at 2:03pm by Kimberly*

**Chemisty**

It is not one question. It is a series of questions. First calculate the total volume of the atmosphere. Second calculate the total number of gas molecules in the atmosphere. Third calculate the number of gas molecules in Caesar's last breat. Fourth calculate what fraction of ...
*Thursday, November 1, 2012 at 9:05pm by Garcia*

**chemistry**

Write the acid/base equation. Calculate mols KOH. Calculate mols CH3COOH. Calculate mols salt formed. Calculate how much of the acid is unreacted. The salt and acid form a buffered solutin. Use the Henderson-Hasselbalch equation to solve for pH.
*Saturday, April 19, 2008 at 10:09pm by DrBob222*

**Chemistry - Solubility**

0.5 g of Ca(OH)2 was placed in a flask. 100mL of 0.05M NaOH was poured into the flask. 25mL aliquot was filtrated and used for titration. Suppose to calculate the OH^- equilibrium concentration from the titration data, as well as the OH^- from the original solution. Then ...
*Monday, March 31, 2014 at 10:45pm by PleaseHelpThankYou!*

**science (very important)!!!!**

calculate moles of H+ added: 1.000*.1=.1Mol calculate moles of Na: .5*.2+.5*.2*2 calculate moles of Cl : 1.0*.1+.5*.2 and so one with the sulfate ion. Finally, divide each by the total volume, 2liters.
*Saturday, June 23, 2012 at 12:37pm by bobpursley*

**math**

PQ is a vertical tower 95m high, the points R and S are on the same horizontal plane as Q, the angle of elevation of P from R is 35 if QS =155m and Q from RQS=48 1.Calculate the distance of QR 2.Calculate the distance of RS 3.Calculate the are of QRS
*Sunday, May 19, 2013 at 9:15am by victor*

**Chemistry!!!**

Won't the van't Hoff equation allow you to calculate dHo? Then use K to calculate dGo = -RTlnK, and use that for dGo = dH-TdS to calculate dS.
*Friday, April 20, 2012 at 6:57pm by DrBob222*

**math**

Calculate volume of locker V=L*W*H Calculate volume of books (given) B=1545 in³ Calculate volume left =V-B
*Friday, July 19, 2013 at 9:53am by MathMate*

**Chem**

I am unfamiliar with an absorbance of 0.40%. 0.40, yes, but not the percent. If it really is 0.4%, then I would use 0.004 for A. A = kc where A = absorbance, c is concn and k is a constant. You must calculate the k. Use any one of the data points, for example, the first one, ...
*Wednesday, March 31, 2010 at 1:52pm by DrBob222*

**Math**

n &isin N, so we are dealing with integers. This is a recurrence relation in which the nth term is defined as a function of the previous term, i.e. (n-1)th term. Take the Fibonacci sequence, which is defined as f(n)=f(n-1)+f(n-2) f(0)=0 f(1)=1 for n∈N. So f(2)=f(1)+f(0)=0...
*Thursday, April 14, 2011 at 5:37am by MathMate*

**Chemistry**

An electron ps from the 6th to te 3rd energy level in the hydrogen atom: a) calculate the wavelength b) calculate the frequency c) calculate te enrgy d) into which spectral series would the photon be grouped? (i really just need to formulas, then i could solve myself...)
*Monday, May 23, 2011 at 9:52pm by Ella*

**physics**

Consider N atoms con¯ned on a surface of area A at temperature T . The atoms form a two-dimensional (2D) gas of classical, noninteracting particles. (a) Calculate the partition function for the system. (b) Calculate the Helmholtz free energy, F , of the gas. Compare it with ...
*Monday, June 13, 2011 at 5:31pm by esmat*

**AP Chemistry**

In 1.33L container, 4.20 AB3, is heated to 400C, and 2.98x10-2(negative 2) moles of A is present at equilibrium. AB3(g) <----> A(g)+ 3B(g) (28.23amu) (a.) Write the expression for K (b.) Calculate the equilibrium concentration of the following gases (i.) B (ii.) AB3 (c...
*Thursday, March 25, 2010 at 12:03am by sheer*

**chemistry**

delta T = Kf*m calculate m m = moles/1 kg solvent calculate moles moles = grams/molar mass calculate grams. Use the density if you want to measure the ethanol by volume.
*Saturday, March 6, 2010 at 9:35am by DrBob222*

**Chemistry**

At 298 K, nitrous acid (HNO2) dissociates in water with a Ka of 0.00071. a)Calculate G° for the dissociation of HNO2. (Use Ka to calculate the answer.) b) Calculate G if [H3O+] = 0.00070 M, [NO2 - ] = 0.16 M, and [HNO2 ] = 0.21 M.
*Thursday, September 29, 2011 at 10:10am by Heather *

**Chemistry**

You don't have enough information posted to calculate concn. First you need to calculate molar absorptivity, which as your post says is e = A/c (that comes from A = e*c) If you used the diluted stock solution for that, you can calculate e by substituting the absorbance of the ...
*Thursday, April 25, 2013 at 5:59pm by DrBob222*

**Math check and question**

x is a binomial random variable. (Give your answers correct to three decimal places.) (a) Calculate the probability of x for: n = 1, x = 0, p = 0.15 P(x) = Correct: Your answer is correct. . (0.85) (b) Calculate the probability of x for: n = 3, x = 3, p = 0.15 P(x) = Incorrect...
*Thursday, June 6, 2013 at 6:03pm by Nora 57*

**Functions**

(a)Consider the function: f(x)=(7x+13)/(13x-1) (i)Calculate the exact values of the coordinates of the points of intersection of the graph of this function with the coordinate axes. (ii)Calculate the equations of the asymptotes (b)The line h(x)=ax+b passes through (-1,-3) and...
*Sunday, May 4, 2008 at 3:44pm by Anonymous*

**Functions**

(a)Consider the function: f(x)=(7x+13)/(13x-1) (i)Calculate the exact values of the coordinates of the points of intersection of the graph of this function with the coordinate axes. (ii)Calculate the equations of the asymptotes (b)The line h(x)=ax+b passes through (-1,-3) and...
*Sunday, May 18, 2008 at 9:13am by Anonymous*

**Chemistry**

moles = grams/molar mass. Calculate moles C6H12O6. m = moles/kg solvent. Calculate m of the solution. Delta T = kb*m Calculate delta T.
*Sunday, March 7, 2010 at 8:00pm by DrBob222*

**chemistry**

HC2H3O2 ==> H^+ + C2H3O2^- Ka = (H^+)(C2H3O2^-)/(HC2H3O2) Calculate (H^+) from pH = -log(H^+). Calculate (C2H3O2^-) from g of the trihydrate. That is moles = grams/molar mass and mole/L (L is 0.15) = M Calculate (HC2H3O2) from L x M = ? Plug in and calculate Ka. For part 2...
*Thursday, July 16, 2009 at 7:35pm by DrBob222*

**Chemistry**

E = hf. You have h and frequency. Calculate E (in Joules) for the transition. I think the easiest way to go about this is to calculate E for the energy levels of the H atom. It's a little work. E = 2.180 x 10^-18/N^2. Now substitute 1 for N and calculate E. Substitute 2 for N ...
*Sunday, September 21, 2008 at 9:13pm by DrBob222*

**Physics**

A 245 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 35.0 cm, as shown in Figure 5-21. (a) Calculate the gravitational potential energy at A relative to B. 1 . (b) Calculate the particle's kinetic energy at B. 2 (c) Calculate the ...
*Thursday, October 20, 2011 at 2:15pm by Brooks*

**college - Environmental Economics**

Subject for the question is from the subject Envoronmental Economics: For each set of parameter values: - Calculate the optimal time to extract the resource - How do you find transistion/switch point? - Calculate the Extraction path (Q0, Q1, etc.) - Calculate the MUC in each ...
*Monday, October 27, 2008 at 2:03pm by Kimberly*

**Chem**

In photosynthesis, plants form glucose and oxygen from carbon dioxide and water. 6CO_2+6H_2O --> C_6H_12_O_6+6O_2 a) Calculate deltaH rxn at 15 degree C b) Calculate deltaS rxn at 15 c) Calculate deltaG rxn at 15 thanks!
*Wednesday, April 7, 2010 at 10:42am by Beau*

**Chem**

In photosynthesis, plants form glucose and oxygen from carbon dioxide and water. 6CO_2+6H_2O --> C_6H_12_O_6+6O_2 a) Calculate deltaH rxn at 15 degree C b) Calculate deltaS rxn at 15 c) Calculate deltaG rxn at 15 thanks!
*Wednesday, April 7, 2010 at 10:43am by Beau*

**Physics**

A cannon ball is fired at 50 m/s at a 37 degree angle above the horizontal. Calculate the time the cannon ball in the air, calculate how high it rises and calculate how far from the cannon the ball lands? Answers: 6.14 s, 46.2 m, 245.2 m
*Tuesday, November 13, 2012 at 10:00pm by Victoria*

**Health Finance**

Question Details Consider the following 2007 data for Newark General Hospital (in millions of dollars): Static Flexible Actual Budget Budget Results Revenues $4.7 $4.8 $4.5 Costs 4.1 4.1 4.2 Pro?ts 0.6 0.7 0.3 a. Calculate and interpret the pro?t variance. b. Calculate and ...
*Thursday, January 26, 2012 at 10:05am by molamidi*

**Chemistry**

moles = grams/molar mass. Calculate moles. m = moles/kg solvent Calculate m delta T = Kb*m calculate delta T.
*Monday, June 7, 2010 at 11:08am by DrBob222*

**Chemistry**

If 12.50 grams of Pb(NO3)2 are reacted with 3.18 grams Nacl in a "typical double displacement" reaction, please calculate the following: a) What is the limiting reagent? b) what is the reagent in excess? c) Calculate the mass of the excess. d) Calculate the theoretical yield ...
*Sunday, April 6, 2008 at 1:16pm by Larissa*

**Physics**

Force F causes displacement d of a 20-Kg object starting from rest along a frictionless path. F= 10 N i + 50 N j + 15 N k and d= 10 m i + 60 m k A) Calculate the work done by the force. B) Calculate the angle between the vectors F and d. C) Calculate the final speed of the ...
*Wednesday, April 22, 2009 at 10:40pm by Sandhya*

**statistics**

Here is a hint for part a): Try a one-sample t-test. You will need to calculate mean and standard deviation to plug into the formula. Calculate, then determine the p-value from a t-table. The p-value is the actual level of the test statistic you calculate. I'll let you take it...
*Thursday, July 19, 2012 at 10:58am by MathGuru*

**Chemistry**

Mass of acetone = volume x density. Calculate mass. moles = grams/molar mass Calculate moles acetone. delta Hvap = 31.3 kJ/mol. Calculate heat transfer.
*Saturday, May 15, 2010 at 11:37pm by DrBob222*

**physics **

Rotating blade (body force in axial loading) A blade is fixed to a rigid rotor of radius R spinning at omega(w) rad/sec around the vertical z axis, neglect the effect of gravity, calculate the peak stress in the blade calculate the blade elongation. calculate the displacement ...
*Wednesday, May 1, 2013 at 6:59am by mehwish*

**chemistry**

delta T = Kf*m Calculate m m = mols/kg solvent. calculate moles. moles = grams/molar mass calculate molar mass.
*Tuesday, February 9, 2010 at 11:41pm by DrBob222*

**Chemistry(please help)**

I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation. 2S2O3^2- + I2 -> 2I^- + S4O6^2- So I got 6.6e-3 L*min for the amount of I2 produced. Now I have to calculate the rate for each ...
*Tuesday, February 28, 2012 at 1:03am by Hannah*

**Mathematics**

(in this question they did not give me any diagrams) use pie 22/7 (a) a piece of wire is bent to form a square of area 121cm squared Calculate the length of each side of the square. Calculate the perimeter of the square. (b) the same piece of wire was bent to form a circle. ...
*Tuesday, June 5, 2012 at 10:57am by INDIANA*

**AP chem**

Use PV = nRT You know P, V, R, and T, calculate n for oxygen. That allows you to calculate CH4 moles and from there moles CO2 and moles H2O. Then calculate total P from new conditions for PV = nRT.
*Saturday, April 11, 2009 at 11:33pm by DrBob222*

**chm**

Write the equation and balance it. NaOH + HCl ==> NaCl + H2O Calculate moles NaOH. Calculate moles HCl. Set up an ICE chart to see what you finish with. If the moles base and moles acid are the same, they exactly neutralize each other and the pH will be exactly neutral for ...
*Wednesday, March 31, 2010 at 4:20pm by DrBob222*

**Physics**

1. Planet X orbits the sun with a mean orbital radius that is 6200 times that of earth. Its diameter is twice that of earth, and its mass is 8 times that of earth. A) Calculate the year of the planet X. B) Calculate the acceleration due to gravity on planet X. C) Calculate the...
*Wednesday, April 22, 2009 at 10:35pm by Sandhya*

**chemistry**

moles = gram/molar mass calculate moles C4H10. molality = moles/kg solvent. calculate molality. delta T = Kf*m calculate delta T and from there freezing point.
*Sunday, March 7, 2010 at 5:28am by DrBob222*

**chemistry **

delta T = Kb*m Calculate m m = moles/kg solvent. Calculate moles moles = grams/molar mass calculate molar mass. Note the correct spelling of celsius.
*Sunday, June 6, 2010 at 6:53pm by DrBob222*

**math answer check**

x is a binomial random variable. (Give your answers correct to three decimal places.) (a) Calculate the probability of x for: n = 1, x = 0, p = 0.15 P(x) = Changed: Your submitted answer was incorrect. 0.15 x 0 = 0 . (b) Calculate the probability of x for: n = 3, x = 3, p = 0....
*Saturday, June 1, 2013 at 4:48pm by Nora 57*

**math115**

If you used the following formula to calculate the quartiles, the answers are correct. There are different ways to calculate quartiles. One that is widely used is to calculate the location of the sorted list, given by: i=(1/4)*(n+1) where n is the number of observations. ...
*Wednesday, October 14, 2009 at 12:47pm by MathMate*

**chem**

Consider the titration of 20 mL of .105M Butric Acid HBut, with .125M sodium Hydroxide? calculate the pH before titration calculate the volume of added base to reach the end point calculate the pH halfway to the equivalence point kb(But-)= 6.6x 10^-10 and ka(HBut)= 1.5x 10^-5 ...
*Monday, March 1, 2010 at 11:38pm by simi*

**physics**

On the first, calculate the time it takes for something to drop 5.24m, then subtract that time from the total time. depth lake=vf*time You can calculate vf from vf^2=2g h and calculate time to surface..5.24=1/2gt^2
*Monday, September 7, 2009 at 7:27pm by bobpursley*

**Chemistry**

Calculate moles NaBr initially. moles = M x L. Calculate moles Cl2 initially. Use PV = nRT or the fact that a gas at STP occupies 22.4 L. Determine the limiting reagent and from that the moles NaCl produced. Then moles = M x L. You know moles and M, calculate L and convert to ...
*Friday, February 12, 2010 at 6:32pm by DrBob222*

**Math**

B = C+2 = L-1 = G+3 B + C + L + G = 38 Express all in terms of B and calculate B. C = B-2 L = B+1 G = B-3 Then calculate other ages.
*Monday, May 6, 2013 at 7:23pm by PsyDAG*

**Chemistry**

Calculate the weight percent of water in NiSO4 6H2O, how to calculate it?
*Wednesday, December 8, 2010 at 5:42pm by Brittany*

**Chemistry**

Calculate the weight percent of water in NiSO4 6H2O, how to calculate it?
*Wednesday, December 8, 2010 at 5:42pm by Brittany*

**Chemistry**

Calculate the weight percent of water in NiSO4 6H2O, how to calculate it?
*Wednesday, December 8, 2010 at 6:28pm by Brittany*

**Physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
*Wednesday, November 30, 2011 at 8:30pm by Matt*

**physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
*Wednesday, November 30, 2011 at 8:36pm by Jordan*

**Physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...
*Monday, December 3, 2012 at 9:42pm by Caleb*

**physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...
*Thursday, December 6, 2012 at 3:34pm by Danny*

**Sara**

how did you calculate pKa because this is a practise question for my test and we won't be given the value. so how would you calculate it?
*Sunday, August 9, 2009 at 8:40pm by Chemistry*

**Chemistry**

I don't really know how to go about this, Please help 1. Calculate the number of moles of the gas. Calculate the volume the gas would occupy at 100.0 C and 15.0 atm. 10.8 g He 2. Given the volume of 54.0 C and 790 torr, calculate the number of moles and mass. 38.1 L CO
*Monday, March 11, 2013 at 1:11pm by Geoffrey*

**Science**

A boy exerts a force of 15N to push a motor bike which has flat tyre for a distance at 30m.calculate the mass of the motor bike. Calculate the density of the motor bike.calculate the work done by the boy.[take g=10m|sm2
*Monday, May 14, 2012 at 3:36am by Nicholas*

**Science**

A boy exerts a force of 15N to push a motor bike which has flat tyre for a distance at 30m.calculate the mass of the motor bike. Calculate the density of the motor bike.calculate the work done by the boy.[take g=10m|sm2
*Monday, May 14, 2012 at 3:38am by Nicholas*

**Physics**

A trunk of mass m = 1.100 kg is pushed a distance d = 32.0 cm up an incline with an angle of inclination theta = 26.0 ° by a constant horizontal force P = 150. N. The coefficient of kinetic friction between the trunk and the incline is 0.330. a) Calculate the work done on the ...
*Friday, October 19, 2012 at 5:30am by Steeve*

**Chemistry**

You so the stoichiometry and calculate the moles CO2 present, then use PV = nRT to calculate volume.
*Thursday, October 7, 2010 at 9:36pm by DrBob222*

**chemistry**

how do i calculate the [OH-] and [Ca2+] using the equivalence point? Then I have to calculate the Ksp for calcium hydroxide.
*Tuesday, November 1, 2011 at 10:07pm by Kris*

**algebra functions**

how do i calculate this if f(x)= 3x+1 and g(x)=x+2 find (f+g)(x) and calculate (f+g)(1) a little confused can some one please help me thank you
*Sunday, October 20, 2013 at 3:42pm by christin*

**Fractions**

Calculate the Following 2/3 + 1/6 + 1/6= I caluclated 2/3 x 2/2 = 4/6 So you would calculate 4/6 + 1/6 + 1/6= 6/6 which = 1 Is that correct
*Thursday, July 24, 2008 at 10:55am by Jennyv*

**physics !!**

how u calculate i calculate get 0.693m . can u explain to me ??how u did this ~ why the 3Hz /4Hz?
*Friday, August 30, 2013 at 11:26pm by kent*

**CHEMISTRY**

A mixture contains 5.00 g each of O2, N2, CO2, and Ne gas. Calculate the volume of this mixture at STP. Calculate the partial pressure of each gas in the mixture at STP. How do you calculate the mole fraction of each gas?
*Tuesday, May 11, 2010 at 9:08pm by ~anonymous*

**Chemistry**

Calculate the mass of CO2(g). I don't know your set up and you didn't explain but it appears mass CO2 is 26.600-25.300 = ? Calculate the number of moles of CO2(g). mols = grams/molar mass Calculate the density of CO2(g) in g/L. At what temperature? 287.4 K. You have grams and ...
*Sunday, October 21, 2012 at 6:33pm by DrBob222*

**physics**

Rotating blade (body force in axial loading) blade is fixed to a rigid rotor of radius R spinning at ω rad/sec around the vertical z-axis. Neglect the effects of gravity. Calculate the peak stress in the blade: σmaxn Calculate the blade elongation: δ Calculate ...
*Friday, May 3, 2013 at 3:28pm by rka*

**Chemistry**

You can use PV = nRT Plug in 1 atm and 1 L and 298 for T, calculate n, then n = g/molar mass to calculate grams.
*Wednesday, March 31, 2010 at 7:01pm by DrBob222*

**Grade 12 Advanced Functions**

One zero of f(x)=x^3+4x^2+x+c is -3. a) calculate the value of c. b)calculate the other zeros.
*Thursday, October 13, 2011 at 9:10am by Rebecca*

**chemistry**

How do I calculate the freezing point of 11.3g FeCl3 in 155g water? I know how to calculate i and m but how do you find Kf?
*Tuesday, December 4, 2012 at 9:19pm by Farah Massardi*

**Chemistry-Please help**

The volume of a sphere is (4/3)*pi*r^3. Knowing diameter calculate original volume. Use PV = nRT to calculate n. You don't have P but the problem states P is constant so just use a convenient number like 1 atm. Then calculate new volume for expanded balloon, plug in everything...
*Thursday, October 15, 2009 at 11:13pm by DrBob222*

**physics**

A 250. MW coal-fired power plant burns fuel with an energy density of 35.0 MJ kg-1. Water enters the temp reduction tower at 293 K and leaves at 350. K at a rate of 4200. kg s-1. 4. Calculate the energy removed by the water each second. 5. Calculate the energy produced by the ...
*Thursday, March 11, 2010 at 7:28pm by needs help*

**physics**

A 250. MW coal-fired power plant burns fuel with an energy density of 35.0 MJ kg-1. Water enters the temp reduction tower at 293 K and leaves at 350. K at a rate of 4200. kg s-1. 4. Calculate the energy removed by the water each second. 5. Calculate the energy produced by the ...
*Thursday, March 11, 2010 at 8:41pm by emily*

**Math**

The function g and h are defined by g(x) 4x+1/3x-2 and h(x)5x-2 Calculate g(0) 4(0)+1/3(0)-2 = -1/2 Calculate h(1/5) 5(1/5)-2 = -1 Determine the value of gh(1/5) 4(5(1/5)-2) (3(1/5)-2)= 4(-1/-1.4)= 2.85 is this right??
*Wednesday, September 9, 2009 at 1:21pm by Keisha*

**physics**

i found the the speed for (a) of when it was launch.. i calculate it from the formula .. v(t)= V+g(t) V=15+9.8(2)=34.6 but how do i calculate it for (b) i tried plugging in 4.2 but i didnt work
*Monday, February 7, 2011 at 11:37am by shaknocka*

**Chemistry**

Calculate whether or not a precipitate will form if 1.30 mL of 0.80 M NH3 are added to 2.2 L of 1.0 10-3 M FeSO4. Calculate Q.
*Friday, March 16, 2012 at 9:13pm by Tanya*

**Calculus 3**

Let u=j+k and v=i+jsqrt2. a) Calculate the length of the projection of v in the u direction. b) Calculate the cosine of the angle between u and v. Your help is very much appreciated!
*Wednesday, January 16, 2013 at 11:18pm by Heather*

**chemistry**

Is this all of the information you have? I think you need the pH at SOME point, or a way to calculate pH at the beginning or the end and I don't see a way to do it without other information. The usual way is to calculate moles of the acid (moles = grams/molar mass) and use ...
*Monday, November 22, 2010 at 12:32am by DrBob222*

**Chemistry**

Calculate Ag^+ in satd Ag2CrO4 from Ksp. Use Eo for Ag/Ag^+ and the Nernst equation to calculate E for the left half of the cell. Use the Nernst equation to calculate E for the right half of the cell. Use the values to determine which half is oxidized and which half is reduced...
*Saturday, March 28, 2009 at 10:45pm by DrBob222*

**College Chemistry**

The density of a 0.0122 M KMnO4 is 1.037 g/mL. Suppose 26.35 g of 0.0122 M KMnO4 are required to titrate 1.072 g of a household H2O2 solution. a)Calculate the mL of MnO4^- added to reach the endpoint. b)Calculate the moles of MnO4^- added to reach the endpoint. c)Calculate the...
*Tuesday, February 25, 2014 at 3:47pm by Kelsey*

**Chemistry**

4. A 5.309 g antacid tablet, with CaCO3 as the active ingredient, was mixed was 30.0 mL of 0.831 M HCl. It took 15.3 mL of 0.7034 M NaOH to neutralize the excess acid. a) Calculate the volume of HCl neutralized by the NaOH. b) Calculate the amount of HCl (in mL) neutralized by...
*Tuesday, April 2, 2013 at 9:53pm by Josh*

**Chemistry**

A 43.0 g sample of hydrated cobalt (II) sulfite is heated to drive off the water. The anhydrous cobalt (II) sulfite has a mass of 26.1 g. Calculate the mass of water. Calculate the moles of water. Calculate the moles of cobalt (II) sulfite. Calculate the mole ratio of water to...
*Friday, October 26, 2012 at 7:52pm by Elizabeth*

**chemistry**

Can one calculate the number of moles of air? If so, calculate the number of moles in 1 kg of air (making sure your calculation, units and assumptions are fully explained); If not, explain why it is not possible to calculate the number of moles of air.
*Wednesday, August 7, 2013 at 11:46pm by sarah*

**To Ms. Sue**

How do I calculate how much grain is required to feed you through the chicken you ate for dinner? And is it necessary to really try and calculate it?
*Tuesday, July 14, 2009 at 2:57pm by devon*

**Chemistry**

For a solution that is 0.20 M HCN(aq) with a Ka=4.9x10^-10 a. calculate the [H+] b. calculate the [OH-] c. what's the pH? Please show your work on how to solve it. Thank you
*Thursday, January 27, 2011 at 8:09pm by Sharon*

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