Sunday

April 20, 2014

April 20, 2014

Number of results: 14,569

**Physics**

While standing on a frictionless ice surface, a 50 kg skater pushes against a wall with an average force of 150 N west for 0.210 s. Calculate the velocity of the skater at 0.210 s. This was what i did: m = 50 kg Fnet = 150 N t = 0.210 s Vf =? Fnet = ma Fnet/m = a 150 N/50 kg...
*Monday, March 28, 2011 at 5:08pm by bram*

**chemistry**

Calculate the molarity of NaI in a soultion obtained by adding 5.0 mL of 0.2 M NaI to a mixture of 5.0 mL of 0.2 M K2SO4,5.0 mL K2S2O8, 4.0 mL of H2O and 1.0 mL of Starch
*Thursday, October 13, 2011 at 7:13pm by krista*

**Chemistry**

c1v1 = c2v2 50*?mL = 0.5 x 500 mL Solve for ?mL. Add ?ml stock to a 500 mL volumetric flask and make to the mark.
*Friday, October 12, 2012 at 5:15pm by DrBob222*

**Math**

50+60+95=205 not 210 Further, the 60 Mil. people not working also aren't looking for work, so they would not be counted (at least in the American system), making the answer 0% which is imposable. If they were counted, the only ones you are looking at are them. SO... 205/60 = 3...
*Saturday, February 23, 2013 at 3:56pm by Ken*

**Chemistry**

mL x M = mL x M 500 mL x 0.200 M = mL x 12 M solve for mL.
*Tuesday, June 8, 2010 at 1:42am by DrBob222*

**Trig**

t = -7(pi)/6. -7(pi)/6 * 180/(pi) = -210 deg. -210 is 210 deg CW from the + x-axis and is in the 2nd quadrant. Ar = [-210] - 180, Ar = 210 - 180 = 30 deg. A = 180 - 30 = 150 DEG CW FROM +X AXIS.
*Tuesday, October 5, 2010 at 12:09am by Henry*

**chemistry**

using this method i calculated 1.03 mL, but this was not one of the options the options were: a. ) 1.28 mL b. ) 1.41 mL c. ) 0.15 mL d. ) 2.18 mL
*Saturday, March 7, 2009 at 11:44pm by Anonymous*

**Science**

An object weighing 90 N has a volume of 45 mL and a mass of 9.0 g. What is its density? A. 0.10 g/mL B. 0.20 g/mL C. 5.0 g/mL d. 10 g/mL Please and Thank YOU
*Tuesday, November 26, 2013 at 11:19pm by Help Scienee*

**chemistry**

A 40.0 mL sample of 0.150 M Ba(OH)2 is titrated with 0.400 M HNO3. Calculate the pH after the addtion of the following volumes of acid, and plot the pH versus millimeters of HNO3 added. a. 0.00 mL b. 10.2 mL c. 19.9 mL d. 30.0 mL e. 39.8 mL
*Monday, June 27, 2011 at 9:02pm by Cindy*

**chemistry**

mL x M = mL x M 35.0 mL x 23.0M = mL x 3.00M Solve for mL which will be the TOTAL volume. The volume to be added will be 35.0 mL less than that.
*Wednesday, April 13, 2011 at 10:16pm by DrBob222*

**Chemistry 151**

Use the dilution formula for these. c1v1 = c2v2 c = concn v = volume for a. 100 mL x 0.1M = ? mL x 1M Solve for ?mL of the 1M. b. 250 mL x 0.5M = ? mL x 1 M Solve for ?mL of 1 M.
*Sunday, March 16, 2014 at 5:18pm by DrBob222*

**Chemisty - urgent**

95/x = 30 x = 3.167 1 mL to 3.167 mL or 10 mL to 31.67 mL or 100 mL to 316.7 mL or 1000 mL to 3167 mL. 95% x (100/3.167) = 30%
*Wednesday, September 15, 2010 at 6:02pm by DrBob222*

**Chemistry Lab**

5.00 mL x 0.005 M = 0.025 millimoles Fe^+3. What is the volume? I see 5 mL + 5 mL + 10 mL = 20 mL. So the initial concn is 0.025 millimoles/20 mL = ?? M If you would rather work as a dilution, it can be done this way: 0.005 M has been diluted by a factor of 5.00 mL/20.00 mL...
*Monday, February 22, 2010 at 9:01am by DrBob222*

**Pre Algebra**

75% increase over 100% is 175% Use direct proportion: 175% : 210 100% : ? Cross multiply to get: 100%*210/175% = 120 Check: 120*(100%+75%)=210, OK
*Tuesday, March 8, 2011 at 11:57pm by MathMate*

**Chemistry**

almost 1.80M x (59.0 mL/268 mL) = about 0.4 but that is not exact. Then 0.4 x [134 mL/(134 mL + 171 mL)]
*Tuesday, March 19, 2013 at 9:49pm by DrBob222*

**Chemistry***

The following equation is given: S2O3 -2 + 2H +1 ---> S + SO2 + H2O [HCl] = 2 mol/L [Na2S2O3]= 0.3 mol/L what is the concentration (mol/L) of H+ if you were to add: a) 20 mL of HCL with 5 mL Na2S2O3 & with 5 mL H2O b) 15 mL of HCl with 5 mL Na2S2O3 & 10 mL H2O c) 7.50 mL of...
*Thursday, November 4, 2010 at 5:38pm by Stephanies*

**Chemistry**

Find the pH during the titration of 20.00 mL of 0.1000 M butanoic acid, CH3CH2CH2COOH (Ka = 1.54e-5), with 0.1000 M NaOH solution after the following additions of titrant: 0 mL, 14.00 mL, 19.95 mL, 20.00 mL, 20.05 mL, 24.00 mL.
*Wednesday, November 23, 2011 at 12:50am by James*

**Chemistry**

Just follow Bob Pursley's advice. Add 1 part concentrated solution to 9 parts water. If you took your 10 mL and added 89 mL water, what would be the final concentration and how much would you have? Another way to look at it is M x mL = M x mL 0.01 x 100 mL = 0.1 x ? solve for...
*Thursday, February 28, 2008 at 4:09pm by DrBob222*

**Algebra 2**

210= 84/(R1/2+R1/3) Multiply both sides by the denominator, assuming that R1 ≠ 0: 210(R1/2+R1/3)=84 Now find the common denominator of 2 and 3 to get: 210(3R1+2R1)/6 = 84 Multiply both sides by 6/210 and simplify: 5R1 = 12/5 R1 = 12/25
*Wednesday, July 22, 2009 at 12:55am by MathMate*

**Math**

3x+5y+3(30)=1770 x=y 3x+5x=1680 x=210 210 adult 240 student
*Sunday, March 2, 2014 at 8:50pm by Java*

**Chemistry**

How accurately is the acetic acid solution to be made? mL x M = mL x M 80 mL x 0.1M = mL x 6.0M mL = (80*0.1/6.0) = 1.33 Technically, the way you do it is to dispense 1.33 mL of the stock solution into an 80 mL volumetric flask, then make the solution to the mark with ...
*Thursday, February 24, 2011 at 12:48am by DrBob222*

**chemistry dilution**

Typos Add 6.67 x 10^1 mL of solvent to 1mL of stock. Converting everything to ug/mL, 200/3 =6.67 x 10^1 mL 200ug/(6.67 x 10^1 mL +1 mL)= 2.96ug/mL
*Wednesday, February 27, 2013 at 8:54pm by Devron*

**integrated math**

Suppose a laboratory has a 26 g sample of polonium-210. The half-life of polonium-210 is about 138 days.?
*Tuesday, January 15, 2013 at 11:22pm by sara*

**math/probability**

You are choosing 4 from 10 or C(10,4) = 210 (why are you multiplying 210 by 4! ? then the order would be important. )
*Friday, July 30, 2010 at 8:35pm by Reiny*

**chemistry**

13 mL is diluted to 56 mL so everything in the original sample is now in 56 mL. If we take 25 mL of that and the M is 2.21M, the the amount in the 56 mL is 2.21M x (56 mL/25 mL) = ?
*Thursday, February 16, 2012 at 8:28pm by DrBob222*

**chemistry**

I got 23...but the answers available are a. 10 mL b. 30 mL c. 50 mL d. 100 mL ... is there something that I am doing incorrectly?
*Thursday, February 13, 2014 at 9:37pm by Jamie*

**chemistry**

210 210 Pb --> Bi + ? 82 83 60 0 Co --> ? + e 27 -1 I need an explanation on how to find the missing product.
*Wednesday, April 6, 2011 at 10:24pm by andrew*

**Chemistry**

You want to use about 40 mL of the titrant which is 1 mg/mL. That means 1 mg/mL x 40 mL = about 40 mg sample. To get 40 mg of the sample, which is 600 mg/L (600 mg/1000 mL = 0.600 mg/mL) means 0.600 mg/mL x ?mL = 40 mg and solve for mL. I get about 66.7 mL. That isn't ...
*Wednesday, November 30, 2011 at 5:10pm by DrBob222*

**Pharmacy Calculaions**

I can't get this right! Please help... Based on the formula below, what quantities of each are needed to make 180 ml of this lotion? Benzyl Benzoate 250 ml Triethanolamine 5 ml Oleic Acid 20 ml Purified water to make 1000 ml
*Thursday, February 21, 2013 at 2:06pm by Elle*

**chemistry**

Can't you use the dilution formula of mL x % = mL x % mL x 25 = 500 x 10 Solve for mL.
*Tuesday, February 15, 2011 at 4:32pm by DrBob222*

**Science math**

Suppose a laboratory has a 38 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 1104 days? How much polonium is in the sample 1104 days later?
*Monday, January 7, 2013 at 2:57pm by Joshua*

**Chemistry**

How do the following solutions show the properties of a buffer? 1) 50 ml 0.10 M NH3 + 50 ml 0.10 M NH4NO3 2) 10 ml solution #1 + 5 ml H2O + 1 ml 0.10 M HCl 3) 10 ml solution #1 + 6 ml 0.10 M HCl 4) 10 ml solution #1 + 5 ml H2O + 1 ml 0.10 M NaOH
*Wednesday, March 20, 2013 at 2:27pm by Jeremy*

**Chemistry-urgent!**

Think it through. If you DILUTE something by a factor of 2, you take 125 mL and make it 250 mL. That makes it weaker, right? How much weaker? 250/125 = 2 x weaker so if it were 5.00% before, now it is 2.50%. If you ended up with 63 mL, the same grams in less volume is MORE ...
*Tuesday, November 30, 2010 at 4:51pm by DrBob222*

**Chemistry**

1. mL x M = mL x M 500 x 4.5 = mL x 18.0 Solve for mL of the 18.0. Remember volumes are not additive; therefore, you can't use 125 mL of the 18.0 M stuff and add 375 mL water. The way you do it is to place 125 mL of the 18.0 stuff in a 500 mL volumetric flask and add water to ...
*Tuesday, August 17, 2010 at 11:14pm by DrBob222*

**advanced math**

If 0°<= 360°, solve the equation, sec x=-2 a. 150° and 210 ° b. 210° and 330° c. 120° and 240° d. 240° and 300° I believe it is C. am i right?
*Thursday, May 28, 2009 at 4:11pm by sophie*

**7th grade math Ms. Sue please help I have no idea!**

actually i got #12 its 6/3 = 70/h 6 x h = 3 x 70 6h = 210 6 ÷ 6 = 210 ÷ 6 h = 35
*Monday, November 5, 2012 at 10:19pm by Savannah*

**Math check**

No. How can you round 210 billion to 9 million? 210,029,000,000
*Wednesday, October 23, 2013 at 9:22pm by Ms. Sue*

**physics**

time 34.9+12.8+50.4+18.8=116.9/60=19.483hrs distance 76.5+96.7+37.7=210.9 210.9km/1.1083hrs=190.2914km/h ?????? done it so many times am so confuse!!!
*Tuesday, September 13, 2011 at 6:28am by Anonymous*

**college chemistry**

What's the solvent? Water? 9% v/v means 9.0 mL propyl alcohol in 100 mL solution. You want 4 mL propyl aocohol. (9 mL/100 mL) x ? = 4 mL ? = 4*100/9 = ?
*Monday, November 12, 2012 at 8:58pm by DrBob222*

**Algebra**

anticipated cost/doz --- x anticipated number of dozen bought = 210/x actual cost/doz = x+3 number of dozen he bought = 210/(x+3) 210/x - 210/(x+3) = 1/2 multiply each term by 2x(x+3) 420(x+3) - 420x = x^2 + 3x x^2 + 3x - 1260 = 0 x = appr 34.03 or some negative value 210/34...
*Thursday, April 17, 2014 at 9:46am by Reiny*

**Chemistry**

What are the units for crying out loud? Are all of them 100 mL. I will assume that is what you meant except for the dilution which I assume is 0.500 L or 500 mL. 14 g/100 = 0.14 g/mL You took 55 mL of that so you have in the aliquot of 55 mL exactly 0.14 g/mL x 55 mL = 7.70 g...
*Monday, February 8, 2010 at 10:54pm by DrBob222*

**Chemistry**

A 30.00mL sample of 0.150M KOH is titrated with 0.125M HClO4 solution. Calculate the pH after the following volumes of acid have been added: 30.0 mL, 35.0 mL, 36.0 mL, 37.0 mL, 40.0 mL
*Thursday, November 17, 2011 at 4:12pm by Shana*

**Physics**

-195.8 deg C = nitrogen boils -210 deg C = nitrogen melts so 0 to 100 X is -210 C to -195.6 C 14.4 deg C is 100 X so change of 1 deg C is change of 6.94 X relation is linear X = k C + b we already know the slope k = 6.94 X = 6.94 C + b when C = -210, X = 0 0 = 6.94 (-210) + b ...
*Tuesday, January 14, 2014 at 5:28pm by Damon*

**science**

Suppose a laboratory has a 31 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 966 days? How much polonium is in the sample 966 days later?
*Tuesday, March 19, 2013 at 12:19pm by Anonymous*

**sciencemath**

Suppose a laboratory has a 31 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of polonium-210 occur in 966 days? How much polonium is in the sample 966 days later?
*Tuesday, March 19, 2013 at 12:19pm by Anonymous*

**math plzzzzzzz help **

perimeter=2*5feet3inch + 2*3feet6inch =17feet6inch (1feet=12inch) total inches = 17*12+6 = 210 inches 210*0.32=67.20
*Thursday, July 7, 2011 at 8:43pm by jnani*

**math plzzzzzzz help **

perimeter=2*5feet3inch + 2*3feet6inch =17feet6inch (1feet=12inch) total inches = 17*12+6 = 210 inches 210*0.32=67.20
*Thursday, July 7, 2011 at 8:43pm by jnani*

**math algebra**

the distance between the trains grows at 115+95 = 210 mi/hr So, it will take 504/210 hours to get 504 miles apart.
*Thursday, February 27, 2014 at 8:58pm by Steve*

**Chemistry**

Isn't this the same as the above? 0.225 x mL = 0.1667 x 750 mL. mL = ? The problem asks for "how many mL of 0.225M must ......." so you have the v (unknown) in the wrong place.
*Thursday, October 25, 2012 at 11:22pm by DrBob222*

**chemistry**

Divide my the density (g/mL)! Notice that the units cancel out! (g)/(g/mL) =(g)*(mL/g) =mL
*Thursday, November 25, 2010 at 7:42am by TutorCat*

**chemistry**

Use the dilution formula. mL x M = mL x M mL x 1M = 100 mL x 0.400 M
*Wednesday, March 23, 2011 at 5:24pm by DrBob222*

**Chemistry**

corrections for the data 1.00 atm 150 mL 1.15 atm 130 mL 1.36 atm 110 mL 1.67 atm 90 mL 2.14 atm 70 mL 3.00 atm 50 mL
*Thursday, April 17, 2014 at 1:18pm by Ally*

**what volume of 0.4 M HCl is required to neutralize**

For a 1:1 ratio of acid to base, which you have, mL x M = mL x M. mL(HCl) x 0.4 M = mL(LiOH) x 0.3 M Solve for mL(HCl).
*Tuesday, July 28, 2009 at 9:57pm by DrBob222*

**Chemistry**

0.0143% v/v means 0.0143 mL/100 mL. mass = volume x density = 0.0143 mL x 0.785 g/mL = 0.011 g/100 mL = 11 mg/100 mL. Compare to 80 mg/100 mL.
*Sunday, October 21, 2012 at 2:48am by DrBob222*

**algebra2**

CD: $X Savings: $4X Mutual: $(15,000-5X) 0.02X + 0.01*4X + 0.1(15000-5x) = 210 0.06X + 1500 - 0.5X = 210 -0.44X = 210-1500 = -1290 X = 2931.82 4X = 4*2931.82 = $11,727.27 = Savings.
*Monday, November 18, 2013 at 11:59am by Henry *

**chemistry**

How many milliliters of NH3 (at STP) are needed to react with 45.0 mL of NO2 (at STP) according to the equation. Can someone please... help me? a) 45.0 mL b) 27.5 mL c) 33.8 mL d) 60.0 mL
*Thursday, April 15, 2010 at 8:59am by Diana*

**Chem3**

A solution is prepared by dissolving 22.8 mL of methanol (d = 0.782 g/mL) in 100 mL of water (d = 1.00 g/mL) so that the final volume of solution is 118 mL. What is the percent methanol by mass?
*Monday, May 2, 2011 at 10:12pm by Ryan*

**Chemistry**

How would I graph this: (I dont understand the whole with [1/volume] (units=1/mL) on the X-axis ) According to Boyle's Law, pressure is inversely proportional to volume, so prepare a graph of the data, with [1/volume] (units=1/mL) on the X-axis and pressure (atm) on the Y-axis...
*Thursday, April 17, 2014 at 1:18pm by Ally*

**chemistry**

No, but thanks for asking. It shows you are thinking about it. 3.25 is L. density is given in g/mL (1 cc = 1 mL) so the units must match. 3.25 L = 3,250 mL and 3,250 mL x 0.97 g/mL = ??grams.
*Sunday, February 13, 2011 at 1:21pm by DrBob222*

**Physics (URGENT)**

total R = 210 ohms, so current is 240/210 = 8/7 amps E=IR so if any R is over 100*7/8=87.5Ω it will experience a voltage drop of over 100V.
*Tuesday, September 24, 2013 at 11:01pm by Steve*

**college physics**

(a) use d=vi*t+0.5*a*t^2 manipulate the equation to solve for t 210 m = (23 m/s)t+0.5(0.150 m/s^2)*t^2 t = 9.41 s (b) v = d/t = 210 m/ 9.41 s = 22.3 m/s I'm still trying to figure out the rest...
*Saturday, January 25, 2014 at 2:10am by Lydia*

**CHEMISTRY**

Please don't use caps. It makes the question difficult to read. mL x M = mL x M mL x 4.00 = 30.0 x 0.800 mL HNO3 stock = (30.0 x 0.800/4.00) = 6.00 mL. So, measure 6.0 mL of the stock 4.00 M HNO3 and add enough water to make 30.0 mL final volume. That will be very close to 24 ...
*Sunday, April 10, 2011 at 9:00pm by DrBob222*

**Maths**

There were 3 glasses containing the same volume of liquid. Mr Lee poured 210 ml of the liquid from Glass A into Glass C, and 150 ml of the liquid from Glass B into Glass C. In the end, the ratio of the volume of liquid in Glass A to the volume of liquid in Glass B was 3:8. A...
*Sunday, September 30, 2012 at 7:12am by Zayn*

**Math 208**

0.7 * 300 = 210 65 + 82 = 147 210 - 147 = ?
*Saturday, February 11, 2012 at 3:27pm by Ms. Sue*

**Chemistry(URGENT, PLEASE HELP!)**

the volume of alcohol present in 620 mL of a 40% (v/v) solution of alcohol is ______? A. 372 mL B. 40 mL C. 248 mL D. 580 mL
*Tuesday, May 4, 2010 at 5:16pm by Kathie*

**chemistry**

What volume of a 7.00 M solution of Ca(OH)2 is needed to neutralize 37.2 mL of a 3 M solution of nitric acid? 1. 15.9 mL 2. 37.2 mL 3. 7.97 mL 4. 24.2 mL
*Tuesday, November 29, 2011 at 3:13am by katie*

**math**

X = the total # of t-shirts. 3x/7 = the # of red t-shirts. x/3 = the # of blue t-shirts. (3x/7-20)=The # of blue t-shirts,also. x/3 = 3x/7 - 20, x/3 - 3x/7 = -20, Multiply both sides by 21: 7x - 9x = -420, -2x = -420, X = 210. 3x/7 = 3*210 / 7 = 90 Red t-shirts. x/3 = 210 / 3...
*Sunday, September 18, 2011 at 2:23pm by Henry*

**statistics**

if a test has a mean of 150 and a standard deviation of 30, we know that: a)50% of the respondents scored between 180 and 210 b)68% of the responents scored above 120 c)50% of the respondents scored between 120 and 210 d) 96% of the respondents scored between 90 and 210
*Wednesday, November 21, 2012 at 2:52pm by carly*

**Chemistry**

M of the 75 mL = 58.2 mL x 6M/75 mL = 4.656M So the initial solution must have been 6M NaOH x 310 mL = 4.656M x ? mL Solve for ? mL, then subract 310 from it to see how much water was added.
*Monday, March 19, 2012 at 12:27am by DrBob222*

**chemistry**

The dilution formula is c1v1 = c2v2 c = concn v = volume 12.0M x 60mL = 1.85M x ?mL Solve for ? mL Actually, I think it is easier to remember mL x M = mL x M
*Tuesday, April 8, 2014 at 11:36pm by DrBob222*

**chemistry**

#1, calculate the M of the commercial solution. 1000 mL x 1.20 g/mL x 0.37 = grams HCl/1L grams/molar mass HCl = ?M since that will be moles/L. Then Mconcd x ?mL concd = 0.500M x 2,500 mL Solve for ?mL.
*Sunday, November 6, 2011 at 1:16am by DrBob222*

**Chemistry**

Would that be 200 mL? 20% x 10 mL = 1% x ?mL ?mL = xx
*Saturday, May 4, 2013 at 4:21pm by DrBob222*

**Chemistry**

The standard solution were prepared by transferring exactly 1.00 mL, 2.00 mL, 3.00 mL, 4.00 ml, and 5.00 ml, respectively, of stock solution to clean 100 ml vol flads, diluting to the mark with FeCl3 solution, and then filling the aoorioruatekt kabeked cuvette. Calculate the ...
*Sunday, February 3, 2008 at 11:03pm by Anonymous*

**algebra**

You could appoach this one of two ways. First, it could be a two equation solution. You know that the product of the two numbers is 210 so your first equation would be x * y = 210 You also know that X and Y will only be one number apart, so your second equation could be y = x...
*Monday, March 29, 2010 at 5:39pm by Anonymous*

**Chemistry**

Consider 51.5 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.210. What volume of water must be added to make the pH = 5.000 I've tried everything but I am not getting the right answer!
*Sunday, January 26, 2014 at 1:36pm by M*

**chemistry**

How many milliliters of NH3 (at STP) are needed to react with 45.0 mL of NO2 (at STP) according to the equation. Can someone please... help me? 8NO2 (g) + 6NH3 (g) --> 7N2) (g) + 9H2O (g) IS this help? a) 45.0 mL b) 27.5 mL c) 33.8 mL d) 60.0 mL
*Thursday, April 15, 2010 at 9:00pm by Diana*

**AP chem**

Consider the titration of 50.00 ml .250 M HBr with .100 M Ba(OH)2. What is the pH after the following additions of Ba(OH)2 to the 50 ml of hydrobromic acid? 0 ml. 15 ml. 25 ml. 50ml. 51ml.
*Wednesday, February 5, 2014 at 11:04pm by Dan*

**chemistry**

I have no idea. You didn't give a mass of AgNO3 used. I can give you a template to use, however, if we assume the mass AgNO3 used initially was 1 gram. Then the original concn was 1 g/10 mL = 0.1 g/mL. Then you took 3 mL of that and diluted to 1000 mL so the new concn is 0.1 g...
*Monday, October 5, 2009 at 3:47pm by DrBob222*

**chemistry**

how much energy in calories, will be required to evaporate 125.0ml of ethanol at its boiling point? Density=0.818g/ml boiling point=78.5C heat of vaporization=210 cal/g
*Wednesday, January 27, 2010 at 12:36pm by Ashley*

**chemsitry **

I usually do too much work to do these dilution problems but I go about it this way. The first one. 1000 ug/mL x 100 mL = 100,000 ug in the 100 mL flask. We want 30 ug/mL x 50 mL = 1500 ug in the 50 mL flask. (100,000/100 mL) x ? = 1500 and ? = 1500 x 100/100,000 = 1.5 mL. To ...
*Sunday, January 31, 2010 at 12:10pm by DrBob222*

**chemistry dilution**

Add 6.67 x 10^1 mL of solvent to 1mL of stock. Converting everything to ug/mL, 200/3 =6.67 x 10^5 uL or 6.67 x 10^1 mL 200ug/(6.67 x 10^5 mL +1 mL)= 2.96ug/mL
*Wednesday, February 27, 2013 at 8:54pm by Devron*

**Chemistry**

Assignment Calculate the pH, pOH, [H+], and [OH] for each of the following solutions. Show all work. (10 Points) Solution Composition of Starting Materials 1 0.10 M acetic acid 2. 5 mL 0.10 M acetic acid + 5 mL wa 3 1 mL 0.10 M acetic acid + 99 mL water 4 5 mL...
*Monday, October 11, 2010 at 12:24pm by Brian*

**college chemistry**

Just pick a number like 100 mL mL x M = mL x M 100 x 0.6 = mL x 0.1 Solve for mL and I get 100*0.6/0.1 = 600 600 mL is what times 100?
*Thursday, November 18, 2010 at 12:16pm by DrBob222*

**corrected repost chemistry**

molar mass CuCl2 = 134.45 8.00M x 0.125L = 1.00 mole CuCl2 in 125 mL. This is 134.45g/125 mL = 1.0756 g/mL in hand. We want 5.9g/50 mL or 0.118 g/mL. We want to dilute by a factor of 1.0756/0.118 = 9.11625 (I know that's too many significant figures). Then 9.11525 x 125 mL = ...
*Sunday, November 6, 2011 at 8:39pm by DrBob222*

**chemistry**

0.475 g aspirin x 0.682 = g ASA. That amount was placed in 250 mL beaker so the concn (in grams) = g ASA/250 mL. Perform that division and you have g ASA/mL. Now you dilute it 3:100; therefore, the new concn is g ASA/mL x (3 mL/100 mL) = g ASA/mL in the new solution. If you ...
*Monday, January 26, 2009 at 1:27am by DrBob222*

**Math**

3 tbsp =3*15 ml = 45 ml. 250 ml base Total volume = 250+45 ml = 295 ml. Concentration =45 ml / 295 ml = 15% approx. (note: 1 tsp=5ml, 1 tbsp=15ml)
*Sunday, August 19, 2012 at 1:46am by MathMate*

**IT 210 Fundamentals of Programming with Algorithms**

If your seriously looking for help in IT 210 or any other AAIT degree class, then do a search on Google for AxiaTutorials all one word and I guarantee that you will get the answers or help that you need. They have helped me countless times especially with the hard classes like...
*Wednesday, June 24, 2009 at 7:02pm by Paul*

**chemistry**

The synthesis of urea by Frederich Wöhler in 1825 began the decline of the idea that "organic" chemicals could only be made by living organisms as part of their biological processes. AgOCN(aq) + NH4Cl(aq) → AgCl(s) + NH2CONH2(aq) If you perform this reaction and collect ...
*Sunday, October 16, 2011 at 10:04pm by Anonymous*

**Chemistry**

Close but no cigar. 6 mL x 0.05 = xmL*0.02 x mL = 15.0 mL which is the final volume. Therefore, you must add 9 mL to the 6 to make 15.0. Technically, you want the final volume to be 15.0 mL; the amount you add may NOT be EXACTLY 9.0 mL since volumes are not additive.
*Thursday, April 18, 2013 at 10:53pm by DrBob222*

**maths-binomial theorem--plse help**

Hmmm. seems like a pointless waste of time. Any exercise to see whether you understand Pascal's Triangle could involve much less work. Anyway, the coefficients of (1+x)^10 are 1 10 45 120 210 252 210 120 45 10 1 The trailing terms get less and less when x<1, so we just have...
*Friday, December 7, 2012 at 11:53am by Steve*

**chemistry **

mL x M = mL x M 50.0 x 0.250M = mL x 1.00M Solve for mL.
*Wednesday, May 25, 2011 at 4:54pm by DrBob222*

**percentage**

Start with 780 mL milk. Placed 221 mL in glass + 130 mL in cup = 351 mL removed from the jug. How much is left in the jug? That will be 780 mL - 351 mL = 429 % remaining = (429/780)*100 = ?
*Saturday, February 11, 2012 at 9:16pm by DrBob222*

**Chemistry**

What is the molality of a solution prepared by dissolving 2.00 mL of bromine (d = 3.103 g/mL) in 125 mL acelic acid, HC2H3O2 (d = 1.05 g/mL) Choose one answer. a. 0.301 b. 0.335 c. 0.296 d. 0.593
*Wednesday, February 10, 2010 at 1:32pm by CC*

**chemistry**

mL x M = mL x M 105 mL x 0.25 M = ??mL x 8 M. So you take ??mL of the 8 M and make it to a total volume of 105. The resulting solution will be 0.25 M.
*Monday, January 25, 2010 at 7:10pm by DrBob222*

**Chemistry**

If that is 21.6%(v/v), it means 21.6 mL EtOH/100 mL soln; therefore, 20 mL will contain 21.6 mL EtOH x (20 mL/100 mL) = ?? mL EtOH. Then mass = volume x density.
*Saturday, July 24, 2010 at 12:24am by DrBob222*

**Physics**

Vo = 210m/s[70o] Xo = 210*cos70 = 71.82 m/s. Yo = 210*sin70 = 197.3 m/s. 1. h = (Y^2-Yo^2)/2g=(0-197.3^2)/-19.6 = 1986 m.
*Friday, April 11, 2014 at 3:06pm by Henry*

**Physics please check**

Use the density of water as 210*10^-6 so (210*10^-6)(0.5*10^-3)(90-19) = 7.455*10^-6 or 0.000007455
*Friday, April 13, 2007 at 10:17pm by Summer*

**math**

A local photocopying store advertises as follows. " We charge 9 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 210 , and 3 cents per copy for each copy 210 and above. " Let x be the number of copies ordered and C(x) be the cost of ...
*Wednesday, February 12, 2014 at 9:51pm by Clara*

**Chemistry**

200 mcg/mL protein x 0.10 mL = 20 mcg protein. You place that into a total volume of 0.10 mL + 0.90 mL + 2.00 mL so that 20 mcg is now in 3.00 mL (assuming the volumes are additive. Technically they are not but with such dilute solutions the difference is not enough to worry ...
*Tuesday, October 8, 2013 at 4:53pm by DrBob222*

**chemistry**

First calculate the molarity of the HCl furnished. That will be 1000 mL x 1.18 g/mL x 0.34 = about 400 g moles HCl = grams/molar mass = about 400/36.5 = about 11M Then you need to decide how much of the 0.50M soln you want. If you want 1000 mL, then you want mL x M = mL x M mL...
*Sunday, November 6, 2011 at 7:48pm by DrBob222*

Pages: <<Prev | 1 | **2** | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Next>>