Monday
March 10, 2014

# Search: How many grams of CaCl2 would be dissolved in 1.9 L of a 0.19 M solution of CaCl2?

Number of results: 98,875

Probability
Agree that the numbers are enourmous, so I will leave answers in notation form a) prob of having ticket = 19/20 So prob that 200 people have a ticket = (19/20)^200 b) prob that at most 3 will have no tickets = prob(3 no ticket) + prob(2 no ticket) + prob(1 no ticket) + prob(0 ...
Friday, April 30, 2010 at 2:09am by Reiny

chemistry
When sulphur dioxide is dissolved in water and a drop of Universal Indicator was added the indicator, what colour would the indicator turn ?
Wednesday, April 24, 2013 at 5:28pm by Anonymous

Chemistry
You would use stoichiometry. Multiply the amps by the time (convert minutes to seconds, then you end up with Coulombs. The stoichiometry should look a little like this... (amps x time)(1 F/96,500 coulombs)(1 mol e-/1 F)(3 mol e-/1 mol Cr)(Molar Mass of Cr/1 mol Cr) ... I got ...
Friday, June 11, 2010 at 2:59am by Amanda

Chemistry
You would use stoichiometry. Multiply the amps by the time (convert minutes to seconds, then you end up with Coulombs. The stoichiometry should look a little like this... (amps x time)(1 F/96,500 coulombs)(1 mol e-/1 F)(3 mol e-/1 mol Cr)(Molar Mass of Cr/1 mol Cr) ... I got ...
Friday, June 11, 2010 at 2:59am by Amanda

Math
2 / 19 = x / 76 Multiply both sides by 76 2 * 76 / 19 = x 152 / 19 = x 8 = x x = 8 in
Wednesday, April 11, 2012 at 8:43pm by Bosnian

holy school
H2 S + HNO3 --------> NO + H2 O + S 150 g of hydrogen sulfide are dissolved in 3500 mL of water. a. What is the molarity of the hydrogen sulfide solution? b. How many grams of sulfur can be produced from 50 mL of this solution? c. 22.4 L of nitrogen monoxide gas are ...
Sunday, March 3, 2013 at 12:02am by mamta

Chemistry
Yes, total Q = sum of individual q1, q2 , q3. You have given the specific heats called heat capacity. The only thing you need to be careful about is that the mass of water etc is given as 18 grams, the unit for heat capacity is in kJ/mol so you must convert mass H2O to mols (...
Friday, December 16, 2011 at 3:47pm by DrBob222

chem
a 10.0% sucrose solution has a density of 2.00 g/mL. what is the mass of sucrose dissolved in 1.00 liter of this solution? thanks, mary Well, in a liter, there are 2000 grams (from density), and 200 of those are sucrose.
Saturday, April 21, 2007 at 3:42pm by mary

problem solving
T = RC = 3.9K * 5uF = 19.5 Milliseconds = Time Constant. t/T = 5ms / 19.5ms = 0.256. i = 105*e^-(t/T), i = 105*e^(-0.256) = 81.3mA. NOTE: If R was in ohms and C in Farads, the Time Constant would be in seconds.
Monday, April 18, 2011 at 9:35am by Henry

Chemistry Pretest
Last and final question: Consider the reaction 2KNO3 + 10K ---> 6K2O + N2. If 155 grams of K reacted with 122 grams of KNO3, what is the limiting reagent? a) KNO3 b) K c) Neither d) not enough information I would think it's d? Because it doesn't ask to know either the ...
Friday, September 28, 2012 at 7:19am by Sarah

Science
Chemistry Enthalpy Calculations? Given the equation: CaO + H2O ----> Ca(OH)2 A 1 g sample of CaO is dissolved in 100 ml water with density 1.00g/ml. The temperature rise is 3.7 degrees C. The specific heat is 4.00 J/g*deg. 1. Calculate the heat (in J) absorbed/given off by ...
Thursday, October 18, 2012 at 5:46pm by Pablo

Calculus
Assume A(1,1,2) B(3,-4,6) and C(-7,0,-1) will form the base of the tetrahedron So vector(AB) = (2,-5,4) and vector(AC) = (-8,-1,-3) the area of the parallelogram is the magnitude of the cross product of those two vectors, so the trianle would be 1/2 of that AB x AC = (19,-26,-...
Monday, May 24, 2010 at 8:00pm by Reiny

Chem
How many oxygen atoms do you have in 2.00 grams of calcium phosphate? Do you use avogadro's number and how? How many Ca^2+ ions do you have in 2.00 grams of calcium phosphate? Any help would be greatly appreciated.
Wednesday, August 5, 2009 at 9:45am by Josh

dr bob
I would convert volume to cc, use density to convert volume in cc to grams. Then q = mass in grams x specific heat x delta T where delta T is 1 = ??. Post your work if you get stuck.
Monday, January 24, 2011 at 11:33pm by DrBob222

Chemistry
If 152 g of a cyclohexyl bromide is dissolved in 932 g of benzene solvent, calculate the boiling temperature of the solution. Consider if the solute is an electrolyte. i kinda get it but im not really sure what the "i" would be equal to.
Tuesday, March 2, 2010 at 3:30pm by Kobe

Chemistry
If each of the salts listed in A through E were dissolved in water to make a 0.1 M solution, which solution would have the lowest pH? a. NaNO2 b. NaF c. AlCl3 d. KNO3 e. Na3PO4
Sunday, February 27, 2011 at 6:19pm by Brian

AP Chemistry
The question asked... Calculate the solubility of calcium sulfate in grams solute per 100 grams solvent. Assume that the volume occupied by the solute in the solution in negligibly small. I solved and got 4.9 x 10 ^-3 mol/L... how do I put this in grams solute per 100 grams ...
Wednesday, April 21, 2010 at 10:56pm by Allie

Physics
h = ho + (V^2-Vo^2)/2g h = 1.75 + (0-19^2)/19.6 = 20.17 m. Xo = 8 m/s = Hor. component of initial velocity. Yo = Ver. component of initial velocity. Vo = 19 m/s = Total initial velocity. cos A = Xo/Vo = 8/19 = 0.42105 A = 65.1o = Angle at which rock is thrown. Yo = Vo*sin A = ...
Thursday, January 16, 2014 at 8:56pm by Henry

math
cases: 6W0M 5W1M 4W2M 3W3M -- no good number of cases = C(19,6) x C(11,0) + C(19,5) x C(11,1) + C(19,4) x C(11,2) = 27132 + 127908 + 213180 = 368220
Wednesday, September 26, 2012 at 12:30am by Reiny

chemistry
A reaction is run in which dissolved silver ions are reduced in the presence of solid copper. THis reaction can be used to produce a silver coating on a copper wire frame. .249g of copper wire was placed in a 100 mL of a 0.500 M solution of silver nitrate. What is the maximum ...
Tuesday, April 19, 2011 at 10:06pm by mmmmm

trig
func(a) = cofunc(90 - a) so, sin(19) = cos(71) similarly, tan(19) = cot(71) sec(19) = csc(71) co-func is just short for "complementary"
Tuesday, September 27, 2011 at 5:55pm by Steve

calorimetry
if 158 grams of silver at a temperature of 98.5 degrees celcius is placed in a styrofoam cup of 85 grams of water at 13 degrees celcius, what would the final temperature of the water be in two minutes
Wednesday, February 25, 2009 at 4:19pm by moe

chem
How many grams of a stock solution that is 87.0 percent H2SO4 by mass would be needed to make 200 grams of a 35.5 percent by mass solution? Show all of the work needed to solve this problem
Tuesday, January 17, 2012 at 5:10pm by bryan

Chemistry
How many grams of a stock solution that is 87.0 percent H2SO4 by mass would be needed to make 200 grams of a 35.5 percent by mass solution? Show all of the work needed to solve this problem.
Monday, September 2, 2013 at 5:39pm by Stephanie

alg 1
Well, then each measurement has a possible error of .5" in either direction. So, the dimensions were 7x8x11 then the % errors roughly add up. .5/7 = 7% error .5/8 = 6% error .5/11 = 4% error So, I'd guess 19% as my choice. min/max dimensions would be 6.5 - 7.5 7.5 - 8.5 10.5...
Tuesday, April 16, 2013 at 2:47pm by Steve

Chemistry
I dissolved 4g of solid NaOH in 200mL of water. I converted grams of NaOH to moles by 4g/40g/moles= 0.1moles. I calculated the concentration of NaOH by 0.1/(200mL/1000L)= 0.5 moles/L. I now have to record the expected mass of benzoic acid required to react in stoichiometric ...
Wednesday, January 13, 2010 at 8:52pm by linda

Mat 116
E(0) = 0 + 64.7 E(4) = m(4)+64.7 = 68.4 m = (68.4-64.7)/4 = .925 or .93 to tenth so E(t) = .93 t + 64.7 2009 - 1990 = t = 19 E(19) = .93 (19) + 64.7 E(19) = 82.4
Saturday, August 2, 2008 at 2:15pm by Damon

Math
Assuming that the two packaging contain the same food, then 24oz bag costs 1.19/24 = 0.05 /oz 36oz bag costs 2.89/36 = 0.08 / oz So bigger packaging does not have to be cheaper. In the supermarket, this is what I would do: 24oz costs 1.19 36oz is 50% more, 50% more of 1.19 is ...
Tuesday, October 19, 2010 at 7:42pm by MathMate

Math
your equation p + 1/[(q+1)/r] = 25/19 reduces to p + r/(q+1) = 25/19 and you say that q = 3, so p + r/4 = 25/19 If p and r are whole numbers, looking at that last equation, there is no way this can happen. did you make a "typo" ?
Saturday, February 7, 2009 at 1:35am by Reiny

Statictics
For those samples, the rate is 19.2% for men and 16.7% for women. A higher rate for men is likley but no proven. You must also consider the sample size and standard deviation. If the male illiteracy probability were 19%, the expected standard deviation in the number of ...
Monday, October 29, 2007 at 11:06pm by drwls

math
y=5 is correct. To multiply by (21-y)(y+19), y must not equal 21 nor -19. Correct until 8(y+19) = 12(21-y) Expand: 8y+152=-12y+252 20y=100 y=5
Thursday, February 23, 2012 at 8:54am by MathMate

math
the sum of a number and 3 times that number is 76. what is that number? PLEASE HELP ME I DONT GET IT!!!!!!!! Mathematics is a language, so translate the English into "math" let the number be x "the sum of a number and 3 times that number is 76", .... what does "sum" mean? x + ...
Wednesday, April 18, 2007 at 3:56pm by Rebekka

Math
A house mouse has a mass of 12 grams. If you put a mouse on a scale, how many paper clips would be needed to balance it if a paper clip has a mass of 12 grams?
Friday, May 31, 2013 at 6:00pm by Anonymous

Physics
m = 14000 MT * 1000 kg/MT = 1.4*10^7 kg MT = Metric Tons. m = mass. F = ma, a = F/m = 6.45*10^5 / 1.4*10^7 = 0.0457m/s^2. V = 69.8 km/h * 1000 m/km * 1/3600 h/s =19.39 m/s. a = (Vf - Vo) / t = 0.0457, (19.39 - 0) / t = 0.0457, 19.39 / t = 0.0457, Cross multiply: 0.0457t = 19....
Monday, October 25, 2010 at 9:21pm by Henry

Chemistry
This is a regular stoichiometry problem. Most of them are worked the same way. Print this out and memorize it. 1. Write the equation and balance it. 2. Convert grams of what you have (in this case 10 g H2) to moles. moles = grams/molar mass. 3. Using the coefficients in the ...
Wednesday, March 31, 2010 at 3:01pm by DrBob222

Chemistry
see same question how many grams nitric acid HNO3 must be dissolved in 350 ml water to make a solution with pH of 4.5"? or "how many ml of a 4.2M nitric acid solution are required to make 500 ml of solution with pH of 2.9
Sunday, May 12, 2013 at 11:29am by kriti

AP Physics B
potential energy lost in fall = potential energy gained by our perfect cord m g (fall distance) = (1/2) k (stretch distance)^2 63.6(9.81)(fall) = (1/2)(67.8)(fall-9.54)^2 623.9 f = 33.9 (f-9.54)^2 18.4 f = f^2 - 19.1 f + 91.0 f^2 - 19.1 f + 72.6 = 0 f = [ 19.1 +/- sqrt (365 - ...
Thursday, November 29, 2012 at 3:48pm by Damon

Chemisty
What is the molarity of the hydrochloric acid solution used if 25mL of it reacted with excess calcium carbonate to produce 5.3g of calcium chloride? CaCo3(s) + 2HCl(aq)---> CaCl2(aq) + CO2(g) + H2O(l) I am really confused on even what this question is asking..any help would...
Sunday, November 20, 2011 at 8:22pm by Jenn

math check if right plz
your schools football team scored 49 points. your team score was 19 points more than your opponent scores. write and solve an equation to find the opponents score is this right. 49-19=s and s would be 30?
Sunday, September 8, 2013 at 4:57pm by scooby

Chemistry
I'll assume your value for n is correct. You need to solve for grams Al and grams Mg. Let X = grams Al then Y = grams Mg ================== X + Y = 0.250 X(2*molar mass Al/3*molar mass H2) + Y(molar mass Mg/molar mass H2) = moles H2. Solve the two equations simultaneously for ...
Sunday, October 9, 2011 at 8:59pm by DrBob222

Find the derivative of f(x)=7x-19 at x=2. I think that the derivative would be 7 and theb times 2 so 14. Is this correct or would it just be 7.
Sunday, January 30, 2011 at 12:03am by Hannah

Math
Based on the property that for any number multiplied by 9 the sum of the digits in the answer must be a multiple of 9 since 18 = 2x9, this still holds true. e.g. 23x18 = 414 and 414 is divisible by 9 suppose we had deleted a 4, the sum would now be 5. How much to the next ...
Sunday, October 4, 2009 at 7:10pm by Reiny

chemistry
Why divide by 4? Your answer of 0.09895 grams PbCl2 (the 3.55 x 10^-4 is M is in moles/L.) gives grams/liter of solution. The problem asks for the solubility of PbCl2 in grams/250 mL and 250 mL is 1/4 L. By the way, you have carried out the number of decimal places far to many...
Saturday, July 31, 2010 at 1:54pm by DrBob222

Chemistry
I am figuring out how many moles of CU2SO4 are in 485.6 grams. How would you set up the proportion for this? What would the answer then be. Thanks. I really need an example to jumpstart this worksheet.
Monday, April 6, 2009 at 9:04pm by Meghan

Chemistry
No, that formula is no good for calculating mass. I would go about it this way. moles needed = M x L = 0.442 x 0.800 = ?? Then moles = grams/molar mass. You know moles from the first calculation and you know molar mass, solve for grams.
Monday, October 11, 2010 at 4:35pm by DrBob222

Chem
For the following reaction, 77.9 grams of barium chloride are allowed to react with with 68.8 grams of potassium sulfate. What is the maximum amount of barium sulfate that can be formed in grams? What is the FORMULA for the limiting reagent? What amount of the excess reagent ...
Sunday, May 15, 2011 at 2:37pm by moose

chemistry
In the following reaction, how many grams of ferrous sulfide (FeS) will produce 0.56 grams of iron (III) oxide (Fe2O3)? 4FeS + 7O2 d 2Fe2O3 + 4SO2 The molar mass of ferrous sulfide is 87.92 grams and that of iron (III) oxide is 159.7 grams.
Saturday, April 13, 2013 at 2:58am by kerin

Chemistry! Test tomorrow, pls help !
This is a stoichiometry problem with an extra step of % thrown into the mix. C6H6 + Br2 ==> C6H5Br + HBr. mols bromobenzene in 50 g is 50/molar mass bromobenzene. Now you wan to convert mols bromobenzene to mols benzene. Since the equation shows you it is 1 mol benzene to 1...
Thursday, October 4, 2012 at 10:03pm by DrBob222

Physics
200 nm = 2 10 ^-8 m (! ! !) Einstein's photoelectric equation: ε =W + KE, ε = hc/λ = 6.6310^-34310^8/210^-7 =9.910^-19 J. W =hf= 6.6310^-349.710^14 =6.4310^-19 J. KE = ε  W = 9.910^-19 - 6.4310^-19 =3.4710^-19 J.
Sunday, May 27, 2012 at 5:58pm by Elena

Chemistry
1.005 grams of potassium iodate is reacted with .5 grams of potassium iodide. THe net ionic reaction is shown below. IO3-+8I-+6H+-->3I3-+3H2O How many grams of the L3- are produced?
Wednesday, June 3, 2009 at 1:54pm by Juggernaut

chemistry
If a student added 42.6 grams of sodium sulfite to 780.4 grams of water and determined that 3.40 grams of the new solution occupied 3.20ml, what is the weight percent, molality, and molarity of the solution produced?
Thursday, July 18, 2013 at 6:34pm by Sumaiyah

Chemistry II
Also note that units are missing and incorrect in places so that equations do not balance. Relative Atomic Mass (RAM) of Ca : 40 Cl : 35.5 Relative Molecular Mass of CaCl2=40+(35.5*2)=111 Moles=mass in grams/RAM =13.7 g/111 g mol^-1 = 0.1234 mol Molarity of solution = 0.1234 ...
Tuesday, September 1, 2009 at 6:43am by Dr Russ

Principles of Management - Strategic Management
4. Maybe right, but I would argue utilitarian. 19. You are on the wrong end of the scale. The number varies depending on differing language proficiency standards. 7. I am not certain, I would have used accommodation 17. Maybe, I would have leaned to trade protection.
Tuesday, July 10, 2012 at 12:21pm by bobpursley

Chem 2
You want 0.1 mol/L soln. The trick is in how you do it. How many mols do you want. That molos = M x L = 0.1 x 0.175 = 0.0175 mols. Then mols = grams/molar mass. With mols and molar mass you can calculate grams SnCl2. First let me tell you what NOT to do. You DON'T weigh out ...
Tuesday, November 27, 2012 at 7:17pm by DrBob222

Algebra 1b
(5g)^5 * (5g)^19 Distribute. = 5^5 * g^5 * 5^19 * g^19 Add exponents. = 5^24 * g^24
Thursday, December 17, 2009 at 3:08pm by Marth

Physics Help
x = 19.4 cos 235° y = 19.4 sin 235° multiply by -2 to get the x,y of -2r. multiply 19.4 by 2 to get the magnitude
Saturday, February 1, 2014 at 10:27pm by Steve

totally math
you plug/ substitute x and y in each equation start with A first x=1 y=1 1=(2x1)+1= 3 so not same x=1 y=7 7=(2x3)-1=5 x=5 y=13 13=(3x5)-13=2 x=7 y=19 19=(4x7)-3=19 it is the same because y=19 and then the answer you got when you plug in 7 is 19 now A equation x=1 y=1 1=(2x1)+1...
Wednesday, April 7, 2010 at 9:00pm by amy

chemistry
Ca(OH)2 + 2HCl = CaCl2 + 2H2O So, each mole of Ca(OH)2 neutralizes 2 moles of HCl 500mL of 1.00M Ca(OH)2 = 0.50 moles so, you need 1.00 moles of HCl That would be 200mL of 5.0M acid
Tuesday, April 9, 2013 at 9:37am by Steve

chem!
A common flaw in calorimetry experiments to determine the molar enthalpy of solution is to have a mass of solute that is inappropriate for the volume of water used resulting in a temperature change that is too small or too large. A temperature change of 5°C to 10°C is a good ...
Saturday, April 14, 2007 at 2:51pm by bob

Math[kind of]
First of all you would need to know the value of one question = one point, two points, etc. If each question were worth 1 point, on a base of 100, double the 50 = 100, either double 19 = 38 to subtract from 100 = 62 which is like a D- on most grading scales. At any rate you ...
Wednesday, May 13, 2009 at 11:58am by SraJMcGin

Physics
KE = 1.72 eV =1.721.610^-19 =2.7610^-19 J. ε = hc/λ = =6.6310^-34310^8 /39110^-9 = =5.0810^-19 J Einstein's photoelectric equation: ε =W + KE, Work function is W = ε  KE = = 5.0810^-19 - 2.7610^-19 = =2.3210^-19 J. W = hc/λₒ. λ...
Friday, May 11, 2012 at 10:02pm by Elena

math
so the area must be 48 square units, where the length and width are whole numbers so factors of 48 would be 1x48 2x24 3x16 4x12 6x8 the sums of these possibilites are 49,26,19,16, and 14 of these only 19 is a prime number so the length of Jennifer's triangle is 16 and its ...
Wednesday, August 27, 2008 at 7:33pm by Reiny

Chemistry
Calculate the solubility of LaF3 in grams per liter in the following solutions. The Ksp of LaF3 is 2.01 e-19. (a) pure water (b) 0.051 M KF solution (c) 0.065 M LaCl3 solution
Friday, October 1, 2010 at 10:38pm by Tiffany

math
An advertisement states that 8 thermometers cost \$12.42 minus a 3% discount. Dr wants to order a dozen to take advantage of the savings, sales tax is 5% What would the cost be? I divided 8 into \$12.42 with \$1.55 per thermometer. \$1.55 x 12 thermometer = \$18.60 \$18.60 x 5% tax...
Thursday, May 13, 2010 at 4:53pm by LASTDAYS

chemistry
How would set up a problem like this? A mass of 20.0 g of NaOH is dissolved in water to form 5.0 dm^3 of solution. What is the molarity of the hydrogen ion concentration if the temperature is 25 degrees Celsius?
Tuesday, January 11, 2011 at 10:53pm by Kathryn

chemistry
In a bottle of unopened cola, the CO2 dissolved in the liquid is in equilibrium with the CO2 gas above the liquid. The dissolved gas reacts with water molecules in the liquid to from carbonic acid, which also dissociates into carbon dioxide and water. Which chemical equation(s...
Tuesday, April 23, 2013 at 12:05pm by Angeline

Chemistry
A few questions...how many grams are in 48.7x10^24? I don't know how to convert atoms to grams. I can do moles to grams or moles to atoms, but not atoms to grams. My other problem is how do you convert moles to moles as in "how many moles of Cu2O are needed to produce 2.3 ...
Monday, April 20, 2009 at 5:35pm by Angeline

Math
A. Using algebra Let A=number of adults who attended, then 36-A = number of children who attended 19A + 17(36-A) = 646 Solve for A. B. Using arithmetic If only adults went, ticket sales would have collected 36*19=\$684 For every child who went, sales would reduce by \$2. So ...
Monday, December 7, 2009 at 12:29am by MathMate

Chem
I repeat. If you want moles, it is M x L. True, M is molarity and since M = moles/L, then M x L = moles. I assume you have the molarity of the Ca(OH)2. And of course you may convert mL Ca(OH)2 to grams but chemicals react by moles and not grams. By the way, that CaK2P2 I wrote...
Wednesday, July 22, 2009 at 9:49pm by DrBob222

English
1. Yes, "at the age of five" is better. 2. If the members of the group decided to break up their group, then "the group dissolved" is correct. If someone else broke them up, then "the group was dissolved by _____ " is correct. 3. What did the film director offer him? 4. He ...
Tuesday, January 5, 2010 at 5:27am by Writeacher

chem
What's the density of liquid Br2? 25 mL x density = grams. moles = grams/molar mass M = moles/L of soln. The technical answer is no one knows because we don't know that the volumes are additive; in fact, I suspect they are not additive. However, to make things simple I would ...
Monday, April 25, 2011 at 10:51pm by DrBob222

physics
This problem is more complicated than it looks, because the body is nowhere near 100% efficient in doing work. The actual work involved each time the barbell is lifted is 13 x 1.5 = 19.5 ft lb. 19.5 ft lb = 6.43 gram-calories = 0.00643 "food" Calories 100 Calories of actual ...
Saturday, November 22, 2008 at 9:58pm by drwls

chemistry
Note the correct spelling of caustic soda. Also, correct sentence structure helps us read these problems better. How many mols HCl did you use? That's M x L = 0.4M x 0.015L = 0.006. How many grams were in the solution you titrated. That's 8.58 x 50/500 = 0.858 g. Then mols = ...
Tuesday, December 18, 2012 at 9:45pm by DrBob222

Chemistry
Which radioactive sample would contain the greatest remaining mass of the radioactive isotope after 10 years? A. 2.0 grams of 198 Au B. 2.0 grams of 42 K C. 4.0 grams of 32 P D. 4.0 grams of 60 Co By the way the numbers next to the elements are their atomic masses. thanks ...
Saturday, March 3, 2007 at 8:50pm by Sanjay

statistics
the birth of healthy, full term infants in the United States is nearly normally distributed. The mean weight is 3,500 grams, and the standard deeviation is 500 grams. (a) what percentage of the healthy newborns will weigh more than 3,250 grams? (b) what weightswould 95% of all...
Sunday, April 24, 2011 at 6:56pm by ryee

Chemistry
pi = MRT Use pi in atm; i.e., 340/760 = ?atm. Solve for M = molarity. Then M = mols/L soln. You know L and you know M, solve for mols. Then mol = grams/molar mass. You know grams and mols, solve for molar mass. b. delta T = Kf*m You know M, you want m. Use density to convert ...
Saturday, February 16, 2013 at 4:55pm by DrBob222

General Chemistry
What volume of 1.0 M HCl would react completely with 0.20 grams of NaC2H3O2*3H2O? It sounds like an equation I would set up as this and would use mole ratios to calculate the answer: HCl + NaC2H3O2*3H2O --> But I am confused as to what I would put as the products, let alone...
Sunday, April 7, 2013 at 8:18pm by Emily

Physiology
Pure gold has a density of 19 g/ml. If you bought a gold ring and found it had a volume of 0.3 ml and it weighed 5.7 grams, is it real gold? Show me your calculation
Thursday, January 27, 2011 at 2:45am by Jerome

math correct or not?
1. 19 is what percent of 40 a. 19=n x 40;47.5% b. 40=19 x n;2.1% c. 40=19 x n;40.4% d. 19=n x 40;52.3% is it a? 2.64 is 80% of what? a.64 x n=80; 0.8 b.0.64 x n=80; 125 c.60= 0.80 x n;80 d.80=64 x n;1.3 is it c?
Sunday, November 14, 2010 at 6:32pm by Lilly

Chemistry
Convert g CO2 to g C and g H2O to g H. Add grams C and grams H and subtract from total mass to find grams oxygen. Convert g C, g H, g O to moles. moles = grams/molar mass Then find the ratio of the elements to each other. I worked the Na2S2O3 problem for you earlier; this one ...
Monday, October 17, 2011 at 9:21pm by DrBob222

chemistry
For a 10 w/v% solution, we want 10 g solute in 100 mL solution. To obtain 10 g HCl from 37% solution, we need to take 10/(0.37*1.19) = 22.7 g of the concd solution. (Check: 22.7 mL x 1.19 g/mL x 0.37 = 10 grams.) Make the final volume to 100 mL and you will have 10 g/100 mL ...
Monday, June 22, 2009 at 5:10am by DrBob222

Chemistry 1
How many grams of a stock solution that is 92.5 percent H2SO4 by mass would be needed to make 250 grams of a 35.0 percent by mass solution? Can you please teach me how to do this? I get the other stoichiometry stuff, but this one tripped me up because I don't know how to set ...
Tuesday, February 1, 2011 at 8:10am by Brittany

When you subtract the second equation fromthe first, you have B-B which is zero, so B disappears. Solving for A? 100-81=A(100-63), 19=A*37 A=19/37 Now put that into any equation.. 100=100A+B 100=100(19/37) + B B= 100(1-19/37)=100(18/37) and you have A and B check my arithmetic
Wednesday, December 17, 2008 at 3:42pm by bobpursley

chemistry
I will assume you mean 24 grams of carbon burned C + O2 --> CO2 C is about 12 grams/mol O2 = 2*16 = 32 grams/mol CO2 = 12+32 = 44 grams/mol therefore 24/2 = 2 mols carbon that means 2 mols O2 and 2 mols CO2 2 mols CO2 = 88 grams --- answer they also gave you redundant ...
Friday, September 17, 2010 at 4:11pm by Damon

math
the half life of the carbon isotope C14 is about 5700 years. A. about how many years does it take 1000 grams of this substance to decay to 500 grams? B. about what percent of the original amount would you expect to find after 1000 years?
Wednesday, October 9, 2013 at 10:10pm by becky

Chemistry
What's the charge on the electron? I think 1.6 x 10^-19 So 8 x 10^-19/1.6 x 10^-19 = ??
Thursday, March 4, 2010 at 10:44pm by DrBob222

Physics
Hmmmm. Are you certain you want to take physics? Here is an example: a*T+ 19= b*T - 24 subtract b*T from both sides... a*T-b*T+19=-24 subtract 19 from both sides.. T(a-b)=-24-19 then T= -43/(a-b)
Friday, October 2, 2009 at 4:55pm by bobpursley

Solubility of a Salt - Chemistry
a) How many grams of potassium nitrate (KNO_3) can be dissolved in 100 mL of water at 30°C, 60°C, and 70°C? b) How many grams of potassium nitrate should be added to 100 mL of water at 25°C to make a saturated solution? c) The solubility of potassium nitrate increases as ...
Tuesday, October 10, 2006 at 9:52pm by J.M.

chemistry
How many moles do you need in the final solution? That is moles = M x L = ?? How many grams is that? moles = grams/molar mass. Solve for grams.
Monday, June 13, 2011 at 8:51am by DrBob222

Chemistry
A 5.00-gram sample of glucose, C6H12O6, [molar mass = 180.] is dissolved 10.0 grams of water What is the molality of the glucose solution? Calculate the boiling(BP) and freezing points(FP) of this solution to the nearest 0.1 C°. The vapor pressure of pure water at 30ēC is 25.0...
Saturday, January 15, 2011 at 10:26pm by Mark

math
The "reference angle" is arctan 1.2 = 50.19 degrees. You must add 180 to that for the third quadrant. theta = 180 + 50.19 = 230.19 degrees
Saturday, August 25, 2012 at 1:37am by drwls

CHEMISTRY
1) find the mole of NaBr in from the solution you want to prepare using c=n/v where c is concentration in mol/L, v is the total volume in mL. 2). find the mass in grams using m=nMr where the mole is in step 1. the mass in step 2 is the mass of NaBr needed to be weighed on ...
Thursday, May 9, 2013 at 4:21am by bonjo

Chemistry
How would you prepare 455 g of aqueous solution that is 6.50% sodium sulfate Na2SO4 by mass? percent by mass = grams/100 g solution. X grams/455 = 0.065 solve for X. Subtract 455-X to calculate how much water must be added. ok i got -454.935 is this right
Wednesday, February 6, 2008 at 9:33pm by Lauren

algebra
let the integers be n, n+1, n+2, and n+3 n+n+1+n+2+n+3 = -72 4n = -78 n = - 19.5 , but n has to be an integer Four consecutive integers CANNOT add up to -72 check: -16-17-18-19 = -70 -17-18-19-20 = -74 -18-19-20-21 = -78 no way to get -72
Sunday, August 4, 2013 at 8:23pm by Reiny

physics ! HELP !
When fully stretched X = 19 m beyond the unstretched length, the stored potential energy (k/2)*19^2 in the cord equals the gravitational potential energy loss, (M*g*30 m). Therefore, k/2 = M*g*30/(19)^2 = 52.9 k = 105.8 N/m
Wednesday, May 23, 2012 at 10:22pm by drwls

Chemistry
I would do this although it may be the long way around. I would convert all of the "moles" to grams. 1300 kJ/mol = 1300000/46.069 = ??J/g for the heat of combustion. 65.6 J/mol = 65.6/46.00 = xx J/g for the heat capacity (specific heat) of ethanol. 1.00 L ethanol = 1000 mL and...
Tuesday, November 9, 2010 at 7:34pm by DrBob222

physics
Given that the mass of an electron is 9.1 x 10^-28 grams and the charge on an electron is 1.6 x 10^-19 Coulombs, calculate the voltage required to lift an electron 5 cm. not quite sure how to do this.
Saturday, May 19, 2012 at 7:04pm by Martin

chemistry
How would you prepare 1 L of a 1.15 M aqueous solution of MgCl2? What grams of MgCl2 would be used?
Wednesday, June 15, 2011 at 1:30am by Anonymous

precal
The smaller of 2 numbers is 10 less than 4 times the greater number. The bigger number is 19 more than the smaller one. If x is the smaller number one equation is: a)x+y=19 b)x=19-y c)y=x+19 d)x=y+19 I'm almost positive it is c I just want to check. A second equation is: a)x=...
Wednesday, January 17, 2007 at 12:15pm by eragon

science --- grams???
hey, me again... can u please inform me of the following? its important i know this since its very hard to find on google... how long does it take to freeze 1 gram of water? and how long does it take to freeze 2 grams of water? help asap would be greatly appreciated thanx in ...
Monday, February 24, 2014 at 2:23pm by TTR+S<3

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