Saturday
April 19, 2014

Search: 12. How many grams of CO are needed to react with an excess of Fe2O3 to produce 209.7 g Fe?

Number of results: 64,344

Physics (vectors)
I'll do one of them, they are all the same and very easy b) (11,c) + (d,5) = (-12,-3) (11+d , c+5 ) = (-12,-3 so 11+d = -12 d = -23 and c+5 = -3 c = -8
Wednesday, February 13, 2013 at 11:18am by Reiny

math
1. 2 ( x - 3 ) = 2 x 2 * x - 2 * 3 = 2 x 2 x - 6 = 2 x subtract 2 x to both sides 2 x - 6 - 2 x = 2 x - 2 x - 6 = 0 False. No solutions 2. 3 ( y - 3 ) = 2 y - 9 + y 3 * y - 3 * 3 = 2 y - 9 + y 3 y - 9 = 3 y - 9 True for all values of y. infinitely many solutions 3. 10 x - 2 - ...
Thursday, January 2, 2014 at 9:43pm by Bosnian

algebra
The instructions appear quite explicit so you have two ordered pairs (42,22) and (52,12) slope = (12-22)/(52-42) = -10 / 10 = -1 so p = -x + b sub in one of the points, say (42,22) 22 = -42 + b b = 64 p = -x + 64 test with the above point not used, that is , (52,12) LS = 12 RS...
Sunday, January 8, 2012 at 10:17am by Reiny

physics
well, if the 12.4m/s per second was measured by a ground observer, then that is the actual velocity. vertical: 12.4sin50 horizontal: 12.4cos50 Normally, I would have assumed the 12.4m/s was relative to the launching rocket, so that the actual velocity would be added to the ...
Wednesday, November 17, 2010 at 8:38pm by bobpursley

chemistry
Compute the vapor pressure of water above a solution formed by dissolving 25.00 grams of magnesium sulfate, MgSO4 (MM=120.3) in 95.00 grams of water at 338K. The vapor pressure of pure water at 338K is 188.0 torr.
Monday, February 23, 2009 at 7:27pm by Aimee

Chemistry II
How much heat is required? Convert 1.50 moles to grams if heat of vaporization you use is in J/grams or leave it in mols if heat of vaporization you use is in J/mole. q = mass x heat of vaporization. Then q x (1 sec/16.0 J) = ?? sec. Check me out on a little over an hour?
Thursday, February 4, 2010 at 9:27pm by DrBob222

chemistry laboratory
1. You don't say what the pH must be. Decide that, use pH = pKa + log(base)/(acid) and calculate the base/acied ratio, then convert to mass. 2. How many mols NaOH do you need? mols NaOH = M x L = ? mols = grams/molar mass.Solve for grams.
Thursday, May 31, 2012 at 11:48pm by DrBob222

Chem 151
A CaCO3 mixture weighing 2.75 grams was treated with 9.75 mL of 3.00 M HCl to liberate CO2. After the CO2 was liberated, the mass of the mixture decreased to 2.621 grams. Determine the mass of CaCO3 present in the mixture.
Thursday, March 21, 2013 at 10:23pm by Double checking ans

Chem 151
I assume the T of the mixture is 40 C. If pO2 = 0.200 atm and Ptotal = 3.0 atm, then pHe must be 2.8 atm. Use PV = nRT to solve for n = number of mols, then n = grams/atomic mass. You know n and atomic mass; solve for grams. Don't forget that T must be in kelvin.
Thursday, March 21, 2013 at 9:50pm by DrBob222

HELP
Use PV = nRT and solve for n = total mols. nToptal = nN2 + nO2 + nHe. nHe is the only unknown, solve for that. Then nHe = grams/molar mass You know nHe and molar mass, solve for grams. BTW, help is not the subject. Usually I pass these up because they don't say chemistry.
Thursday, July 18, 2013 at 1:17am by DrBob222

chemistry
The problem: Nitrogen can react with steam to form ammonia and nitrogen monoxide gas. A 20.0L sample of nitrogen at 173C and 772mmHg is made to react with an excess of steam. The products are collected at room temperature (25C) into an evacuated flask with a volume of 15.0 A. ...
Wednesday, June 17, 2009 at 7:54pm by Gweedo

English
The comma after "family" is correct. 1. comma needed 2. "playing piano at church" 3. Better: I like pizza, but I don't like kiwi. I don't like milkshakes either. 4. "people who..." -- comma needed after "rains" -- delete "the" before "spiders" 5. delete "music" and "musical...
Tuesday, September 20, 2011 at 4:22pm by Writeacher

math
2,000 / 50 = 6,000 / x Cross multiply and solve for x to find the total number of instructors needed. Then subtract 50 from the total to find the number of new instructors needed.
Monday, March 18, 2013 at 12:39pm by Ms. Sue

Chem
delta T = Kf*molality. Solve for molality. molality = moles/kg solvent. Solve for moles. moles = grams/molar mass. Solve for grams.
Wednesday, March 31, 2010 at 5:48pm by DrBob222

chemistry
delta T = Kf*molality Solve for molality molality = moles/kg solvent Solve for moles. moles = grams/molar mass Solve for grams.
Sunday, December 5, 2010 at 5:09pm by DrBob222

chemistry
delta T = i*Kb*molality i = 2. Solve for molality. molality = moles/kg solvent Solve for moles. moles = grams/molar mass Solve for grams.
Friday, January 28, 2011 at 1:58pm by DrBob222

Chemistry
delta T = Kf*molality Solve for molality. molality = moles/kg solvent. Solve for moles. moles = grams/molar mass. Solve for grams.
Tuesday, March 29, 2011 at 10:27pm by DrBob222

Chemistry
delta T = Kf*m Substitute and solve for m m = mols/kg solvent Substitute and solve for mols. mols = grams/molar mass. Substitute and solve for grams.
Tuesday, January 29, 2013 at 9:40pm by DrBob222

physics
V = i R + L di/dt i will be of form i = I (1-e^kt) where I is the current after a long time determined only by the battery and the resistance because the inductor has no resistance once steady stage is reached. at t = infinity, i =V/R so I = V/R and at t = 0 , V = L di/dt and ...
Wednesday, December 4, 2013 at 1:55am by Damon

calculus
Since the two tangents are mutually perpendicular and intersect on the y-axis they have gradients 1 and -1 The gradient function is y = 6x Hence x = 1/6, -1/6 So y = 1/12 both times So the coordinate of the intercept can be calculated using the equation of the tangents: Equate...
Sunday, October 3, 2010 at 2:22pm by Louis

math
TILING A decroative floor pattern has one red square tile surrounded by 12 blue tiles. Write and evaluate an expression to show how many total tiles (red and blue) are needed if there are 15 red tiles. Then make a table showing the total number of tiles if there are 15,20,25, ...
Wednesday, September 14, 2011 at 7:28pm by cassandra

Chemisty
How much will dissolve in 240 g H2O at 100 C? That will be 25.2 x (240/100) = ? How much will dissolve when cooled? That will be 11.4 x 240/100 = ? g in solution. Then grams at 100 (from above calcn) - g in soln at 20 = grams that will crystallize.
Thursday, January 19, 2012 at 8:36pm by DrBob222

science 7 grade
You place 75 mL sea wter in a graduated cylinder with a mass of 55 grams mass of sea water and cylinder together is 140 grams what is the density of the sea water g/mL
Sunday, September 23, 2012 at 12:35pm by mary

Gen Chem II
delta T = Kf*m. Substitute and solve for molality. Then m = mols/kg solvent. Sustitute and solve for mols. Then mol = grams/molar mass. You know mol and grams, solve for molar mass.
Sunday, February 10, 2013 at 2:44pm by DrBob222

Chemistry
CH4 + 2O2 ==> CO2 + 2H2O + heat So you get 55.5 kJ for 1 gram CH4. You want how many grams to produce 2578 kJ. 1 gram x (2578/55.5) = ? grams CH4 required. Convert that to pounds.
Wednesday, June 19, 2013 at 11:33pm by DrBob222

Chemistry
Is that mass percent? You want [x grams MeOH/(x g MeOH + 35g H2O)] = 0.25 Solve for x = grams methanol. Then mass = volume x density. Substitute mass and density and solve for volume. Post your work if you get stuck.
Saturday, September 7, 2013 at 6:43pm by DrBob222

physics
For a scene in a movie, a stunt driver drives a 1.5010^3kg SUV with a length of 4.00m around a circular curve with a radius of curvature of 0.333 km. The vehicle is to be driven off the edge of a gully 10.0 m wide, and land on the other side 2.96 m below the initial side. ...
Friday, October 11, 2013 at 12:58am by Jen

Chemistry
This is a limiting reagent problem. How do I know that? Because BOTH reactants are given, not just one. 1. You have the equation and it is balanced. 2a. Convert 12.4 g Li to moles. moles = grams/molar mass. 2b. Convert 33.9 g N2 to moles the same way. 3a. Using the ...
Saturday, June 12, 2010 at 10:23pm by DrBob222

Chemistry
mols N2 = grams/molar mass = 14/28 = 0.5 Using the coefficients in the balanced equation, convert mols N2 to mols NO2. That's 0.5 mol N2 x (2 mols NO2/1 mol N2) = 0.5 x 2/1 = 1 mol NO2 Now convert mols NO2 to grams. g = mols x molar mass = 1 mol x 46 = 46 grams NO2
Wednesday, October 16, 2013 at 2:48pm by DrBob222

Chemistry
C + O2 ==> CO2 392 kJ/mol x ? mol = 100 kJ Then ?mol = grams/molar mass. You know mol and you know molar mass; solve for grams.
Friday, April 27, 2012 at 9:04am by DrBob222

chemistry
mols H2O = grams/molar mass mols glycerin = grams/molar mass XH2O = nH2O/total mols Xglycerin = nglycerin/total mols.
Monday, April 15, 2013 at 11:41am by DrBob222

Science
See if any of the following links will help: http://www.google.com/search?q=How+many+grams+of+hydrogen+are+produced+from+the+decomposition+of+100+grams+of+hydrogen+peroxide%3F+&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a Sra
Tuesday, December 6, 2011 at 9:26pm by SraJMcGin

math
First, distribute. Basically, multiply the 2 by 4 and by the -6. That makes it be: 5x + 8x + -12 + 2x Then, you can add all of the x's together to make it simplified, getting: 15x + 12 < 10 Then, take 12 away from each side, and divide by 5. I hope I helped you!
Tuesday, February 3, 2009 at 3:32pm by Katie

Math/Algebra
The simplest solution is by factorization: y^2-4y-12=0 (y 2)(y 6)=0 Since 2*6=12, 6-2=4 are what you are looking for. Now we need to figure out the signs: -12 means that exactly one of the constants (2 or 6) carry a negative sign. If we give assign 2 and -6, we get 2-6=-4, ...
Tuesday, March 8, 2011 at 12:56pm by MathMate

alegbra
Help me solve this problem please, I have tried so many time.I can not seem to get the problem right. x +12 <-8 or x+12>2 x+ 12 < -8 =x +12 > 2 x =4 > -10 is this right
Sunday, April 5, 2009 at 12:57am by Elaine

Chemistry
Do you mean these are percents? Take a 100 grams sample which will give you 12.67 g Al 19.73 g N 67.6 g O Convert each to mol (mol = g/atomic mass), then find the ratio of the elements to each other with the smallest number being 1.00. The easy way to do that is to divide the ...
Monday, March 26, 2012 at 8:08pm by DrBob222

chemistry
mol of CH2 = 12+2 = 14 grams so 7/14 = .5 mol of CH3 equation 2CH2 + 3O2 --> 2CO2 + 2H2O so for every mole of CH2 we get one mole of water and one mole of CO2 so the result is .5 mole CO2 and .5 mole H2O
Wednesday, June 22, 2011 at 3:35pm by Damon

Math help please
1. Each time a touchdown is scored in a football game, 6 points are added to the score of the scoring team. A team already has 12 points. What rule represents the number of points as an arithmetic sequence when n is the number of touchdowns scored? A(n) = 12 + 6n A(n)12 - (n...
Thursday, November 14, 2013 at 7:58pm by Charlotte

Physics check
check your answers: a. In 12.8 seconds, how far do each travel? 1) d=41*12.4=508.4m 2) d= 1/2 (3.3)12.4^2=253.7 m well, that time is wrong. So check the other and see if the distances match.
Tuesday, July 13, 2010 at 7:37pm by bobpursley

chem--electrochemistry
So in this reaction: Ag(s) + Fe(+3) --> Ag(+) + Fe(+2) we are given 20 grams of Ag(s) to start off with. How do we find how many electrons are transfered in the reaction. And how many grams of Fe(+2) is formed. *for the latter, i think that we can calculate it through ...
Sunday, March 28, 2010 at 6:04pm by Rav

Chemistry
Did you work the first part to obtain 3.90m for the KNO3 solution. Then m = moles/kg solvent. Solve for moles. Moles = grams/molar mass Solve for grams. I think it is about 110 g or so but you need to work it through. Second part. (103.45-100) = i*0.512*3.90 Solve for i.
Sunday, January 16, 2011 at 7:41pm by DrBob222

college algebra
y = x(x+12) so the x-intercepts are 0 and -12 and the x of the vertex must be halfway between those intercepts x of vertex is -6 then y = 36 - 6(12) = -36 vertex is ((-6,-36), opens up, and has x-intercepts of 0 and -12 domain: obviously any value of x range: y ≥-36
Friday, November 2, 2012 at 5:09pm by Reiny

Calc
Let the radius be r and the height be h inches V= πr^2 h h =6/(πr^2) SA = 2πr^2 + 2πrh = 2πr2 + 2πr(6/(πr^2) = 2πr^2 + 12/r d(SA)/dr = 4πr - 12/r^2 = 0 for a max or min 4πr = 12/r^2 4πr^3 = 12 r^3 = 3/π r = ... sub ...
Wednesday, August 7, 2013 at 8:27am by Reiny

calculus
ds/dt = -32t + 12 = 0 for a max of s 32t = 12 t = 12/32 sec = 3/8 sec for that time s = -16(9/64) + 12(3/8) + 40 = 169/4 or 42.25 ft above the base of the cliff when he hits the ground, s = 0 -16t^2 + 12t +40=0 divide by -4 4t^2 - 3t - 10 = 0 (t-2)(4t+5) = 0 t = 2 or t = -5/4...
Monday, November 12, 2012 at 10:25pm by Reiny

Business
A group of 9 trout (considered the population) were isolated in a pond and fed a special food mixture called Grow Em Fast. At the end of the experimental period, the weights of the trout were (in grams): 124, 125, 123, 120, 124, 127, 125, 126 and 121. Another special mixture, ...
Friday, September 10, 2010 at 11:16pm by John

Math
A group of 9 trout (considered the population) were isolated in a pond and fed a special food mixture called Grow Em Fast. At the end of the experimental period, the weights of the trout were (in grams): 124, 125, 123, 120, 124, 127, 125, 126 and 121. Another special mixture...
Saturday, September 11, 2010 at 11:13am by John

Chemistry
No options. Use PV = nRT and solve for n= number of moles. Then n = grams/molar mass. You know n and grams, solve for molar mass. Finally compare the molar mass in the answer above with the molar mass of each of the possibilities you have as answers and identify the gas that ...
Friday, September 21, 2012 at 9:45pm by DrBob222

Physics
a) The center of mass of the can is halfway up; the center of mass of the soda in the can is also halfway up when the can is full of soda, so the center of mass is (0.135*(12.4/2) + 1.25*(12.4/2))/(0.135+1.25) b) After the can loses all the soda, the center of mass is the ...
Friday, November 9, 2012 at 9:53pm by Jennifer

chem
A solution prepared by dissolving 3.00 grams of ascorbic acid (vitamin C, C6H8O6), in 50.0 grams of acetic acid has a freezing point that is depressed by T = 1.33 oC below that of pure acetic acid. What is the value of the molar freezing point-depression constant for acetic ...
Monday, February 18, 2013 at 10:57pm by Ace

denominators
You need to use parenthesis. If this is your problem v/(v+5)+v/3 = -4/(v+5) Multiply both sides by 3(v+5) 3v + v(v + 5) = -12 3v + v^2 + 5v = 12 v^2 + 8v + 12 = 0 (v + 2)(v + 6) v = -6 or v = -2 Make sure you check the solutions in the original equation. I have NOT checked the...
Tuesday, March 1, 2011 at 9:44pm by Helper

math
In the U.S. a date such as January 12, 2003 is written 1/12/03, but in many other countries the day and month are interchanged, giving 12/1/03. If you didn't know which system was being used, how many dates in a year would be ambiguous to you?
Tuesday, February 14, 2012 at 4:32pm by Tonya

physics
a1 = (v-Vo)/t = (62-50)/t = 12/t. a2 = (0-12) = -12/t. Since their times and change in speed are equal, the magnitude of their acceleration are equal. The neg. sign means the bike was stopping or slowing down.
Sunday, September 16, 2012 at 11:21pm by Henry

Analytical Chemistry
Consider the titrations of 24mL of 0.050M HClO4 with 0.100 M KOH. Find the pH at the following volumes of KOH; Vb: 0.1, 5, 10, 12.40, 12.50, 12.60, 13 mL
Sunday, October 7, 2012 at 5:31pm by Jocelyn

Algebra business
Using the formula below, where r is the annual interest rate, with n periods per year for t years, F = P((1+i/n)^(nt)-1)/(i/n) we have = 625((1+.0384/12)^(12*15)-1)/(.0384/12) = 151,811.20
Tuesday, March 19, 2013 at 3:45pm by Steve

trig
I drew a circle, and a vertical radius of 12 m In 40 s, it rotates 360, so in 5 sec it rotated 45 let the vertical position from the centre be y cos45 = y/12 y = 8.485 m so he is 12-8.85 or appr 3.5 m high after 5 seconds
Monday, March 31, 2014 at 8:54am by Reiny

Physics
At the college bookstore, or Barnes Noble, you can find Schaum's Outline Series, College Physics, in which problems such as this are detailed in solution. I recommend it to you. Now. If F (90N) is pushing on M1, which is pushing also M2 and M3, and the acceleraltion is then ...
Sunday, July 12, 2009 at 6:48pm by bobpursley

chemistry
Na2CO3 + 2HCl ==> H2O + CO2 + 2NaCl You want 175 mL CO2. You know pressure and temperature of the lab. Use PV = nRT to calculate moles in 175mL CO2 at the conditions of the lab. Using the coefficients in the balanced equation, convert moles CO2 desired to moles HCl. Then ...
Tuesday, November 30, 2010 at 3:06pm by DrBob222

chem
Would you expect 2-chlorobutane to react faster or slower than 2-bromobutane under Sn1 conditions? Sn2 conditions?
Monday, November 24, 2008 at 9:58pm by Jason

chem
I would assume that both Cu and Ag would react with Cl2 gas. At least to the tarnish stage.
Wednesday, March 18, 2009 at 4:47pm by DrBob222

chemistry
What volume (in mL) of the base will react completely with 30.00 mL of 0.550 M HCl? 0.0500 M Ba(OH)2
Wednesday, September 30, 2009 at 1:39pm by Grant

Chemistry
does limiting reagents react wuth all the reacnats? Is the limiting reagent used to calculate the amount of products?
Thursday, January 21, 2010 at 6:39pm by jake

Chemistry
If 5.0 moles of propane react, how many molecules of water will be formed? A.3.0x10.24 B.4.8x10.24 c.1.2x10.25
Thursday, August 5, 2010 at 10:21am by Jarred

Chemistry
You react 25.0 g hydrogen gas with 30.2 g oxygen gas. Determine the mass of water that can be produced from these reactants.
Wednesday, December 8, 2010 at 6:20pm by Adog

chemistry
Dissolve? Or react... how many moles of Cu? .5/atomicmassCu how many moles of nitric acid? 4*molesCu volume: molesNitriacid/16
Thursday, February 3, 2011 at 8:41pm by bobpursley

Chemistry
How do I balance the following into an equation? 10 mL of 2.0 M HCl is react with 8 mL of 1.7 M Ca(OH)2 in a neutralization reaction.
Wednesday, April 27, 2011 at 12:11am by Please HELP!!!

chemistry
if unlimited iron is available to react with 34.0g of copper (II) chloride, how many g of copper metal would be produced?
Saturday, May 14, 2011 at 7:47pm by me

chemistry
Given the reaction of hydrogen and chlorine gases, calculate the moles of hydrogen that react to produce 4.20 mol
Sunday, July 10, 2011 at 7:54pm by Anonymous

Please help!
Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.
Wednesday, September 28, 2011 at 5:24pm by Brittany

port charlotte high
2Nacl +2HCL = 2NaCl + H2 what mass of sodium is required to react with 8.45g of HCl
Monday, February 25, 2013 at 5:22pm by john

chemistry
does kh2po4 react with sodium lauryl sulphate and can we use nah2po4 insted of kh2po4 in prepration of 0.2 m phosphate buffer ?
Saturday, May 4, 2013 at 7:45am by jiya

Chemistry
B is reactant.so if you want to increase the C then you have to increase the B. i think you can also do this by increasing temp. which gives d energy to molecules to react.
Monday, May 20, 2013 at 12:12am by kuldeep

Chemistry
The hint says the acid and base will react completely until one or both is completely used up.
Tuesday, July 16, 2013 at 3:57pm by Cat

Chemistry
Note that the aspirin reaction is 1:1:1:1. 1. You want to prepare 45.0 g aspirin but since the yield is only 85.0%, you must try to prepare 45.0/0.85 = about 53 g. I rounded here and there so you need to do it exactly. 2. Convert 53 g aspirin to mols. # mols = grams/molar mass...
Monday, September 22, 2008 at 11:06pm by DrBob222

algebra 1
The sum of two integers is greater than 12. One integer is ten less than twice the other. What are the least values of the integer? how would you set up this problem??? a + b = 12+ a = 2b - 10 a + 10 = 2b a + b = 12+ 10 - b = 20 - 12+ 3b = 22+ Minimum b = 8 Corresponding ...
Thursday, October 11, 2007 at 6:42pm by tchrwill

Math
How do you simplify 5/12? I know you have to multiply the denominator,12, by a radical to make a perfect square.. I think you're supposed to multiply it by 12? But there seems to be other numbers multiplied by 12 that can make a perfect square too, but 12's the first one I...
Saturday, May 9, 2009 at 6:25pm by Angie

Honors Chemistry
The book is right. ALL of these problems can be worked this way. 1. Write and balance the equation. 2. Convert what you have (in this case Fe) to moles. moles = grams/molar mass= ??. 3. Using the coefficients in the balanced equation, convert moles of what you have into moles ...
Tuesday, February 23, 2010 at 9:38pm by DrBob222

Chem
H. Using the technique outlined in this lab, a student decided to test wastewater for the presence of phosphate. The first reading produced an extremely dark blue color and a concentration higher than 3ppm. After performing a 10 ml dilution, the colorimeter measured a ...
Sunday, July 14, 2013 at 8:50pm by Morgan

Math
L x W x H 18 x 14 x 8 Room Perimeter P = 2W + 2L P = 2(14) + 2 (18) P = 28 + 36 P = 64 Perimeter * Height P = 64, H = 8 Area to paint = 64 * 8 A = 512 sq ft 512 sq ft/256 sq ft paint coverage = gal of paint needed 512/256 = 2 gals per coat 2 gals/coat * 2 coats = ? ttl gals ...
Thursday, February 24, 2011 at 9:24pm by Helper

PRECALCULUS
Maybe we must find the square of sqrt7(cosPi/12+isinPi/12)? sqrt7=2.646 cosPi/12=0.966 sinPi/12=0.259 2.646(0.966+i0.259)=2.556+0.685i
Tuesday, April 19, 2011 at 11:07pm by Mgraph

Chemistry
Since moles = grams/molar mass; then molar mass = grams/moles molar mass = 0.405 g/0.0050 moles = 81.00000. Rounding to the nearest tenth, I would put 81.0 g/mole as the answer.
Tuesday, March 17, 2009 at 3:21pm by DrBob222

GVHS
6(x^2 -2) = 12 I would write this as 6x^2 -12 = 12, then 6x^2 -24 = 0 6(x^2-4) = 0 6(x+2)(x-2) = 0 x = +2 x = -2
Tuesday, June 3, 2008 at 10:05pm by DrBob222

Math
Yes. 14 1/4 - 12 3/8 = 14 2/8 - 12 3/8 = 13 10/8 - 12 3/8 = 1 7/8
Friday, July 31, 2009 at 9:22pm by Ms. Sue

Math(Please help)
Is this correct for the last part? (8)(3.14)(12) X (1/(2)(3.14)(12^2) = 4/12
Friday, March 4, 2011 at 10:31pm by Hannah

math
4 x (32-2) + 12/4 x 3 ? (4 * 30) + 12 / 12 = 120/1 = 120
Monday, August 8, 2011 at 10:01pm by Ms. Sue

math
first in feet 144/12 = 12 feet 12/3 = 4 yards
Thursday, March 1, 2012 at 6:24pm by Damon

7th grade math mac please
.12 or 12% .126 or 12.6%
Wednesday, December 5, 2012 at 7:27pm by Mac

math
Check: 12+12=24 3(12-4)=3*8=24 So answer is correct.
Sunday, July 7, 2013 at 12:45am by MathMate

math
d = (3/12) * 5.9*10^12 = 1.475*10^12 mi. You are correct.
Thursday, January 9, 2014 at 2:53pm by Henry

Statistics
Suppose a certain species bird has an average weight ofx=3.55 grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with 0=0.37 grams. For a small group of 15 birds, find the margin of error for a 70% confidence interval for...
Thursday, June 17, 2010 at 10:44am by Jacob

Chemistry
25% is a lot of citric acid in lemonade, it is usually ca 5% or less. Start from a balanced equation: NaOH + 3-carboxy-3-hydroxypentanedioic acid -> 3-carboxy-3-hydroxypentanedioic acid, trisodium salt + H2O which you need to balance OK. Let us assume that the 25% is by ...
Tuesday, November 9, 2010 at 6:59am by Dr Russ

Physics
When I look into my beautiful 1981 Vanagon's rear view mirror, I see a semi-truck coming toward me way too fast. The truck has lost its brakes and is traveling at 140 km/hour down the steep mountain road we're on. At the last second, the truck exits onto an escape ramp that ...
Tuesday, October 9, 2012 at 10:43pm by Dianne

math
the hyperbola x^2 - y^2 = 140 can be factored to (x+y)(x-y) = 140 140 = 2x5x2x7 or in pairs: 14x10 or 28x5 or 2x70, or 35x4 so we are looking for any two numbers x and y so that their sum x their difference is 140, using only the numbers above e.g x+y=28 x-y = 5 add them: 2x...
Monday, January 10, 2011 at 10:39pm by Reiny

chemistry
What I would first is to find the amount of mols of H3PO4. Since you know that 1 M means there is 1 mol of solution in every 1 liter, you can figure out the moles of the solution. The solution is 6M, so that means that to find the moles of solute in the solution you multiply ....
Thursday, February 28, 2008 at 6:09pm by Anonymous

Trigonometry
if cot 2 = 5/12 then tan 2 = 12/5 recognizing the familar 5-12-13 right-angled triangle, we would say sin 2/cos 2 = 12/5 = (12/13) / (5/13) so sin 2 = 12/13 ----> 2sincos = 12/13 and cos 2 = 2cos^ -1 = 5/13 2cos^2 = 18/13 cos^2 = 9/13 cos = 3/√13 if ...
Thursday, November 28, 2013 at 3:26pm by Reiny

Chemistry
moles acid used = M x L. Moles CaCO3 is 1/2 that because CaCO3 + 2HCl ==> CaCl2 + H2O + CO2 moles CaCO3 = grams/molar mass. You have moles and molar mass. Solve for grams.
Sunday, March 14, 2010 at 3:50pm by DrBob222

Chemistry
Consider the following reaction. 2KClO3(s) 2KCl(s) + 3O2(g) A)How many grams of KCl are produced from the complete reaction of 10.9 mol of KClO3? B)How many grams of KCl are produced from the complete reaction of 86.2 g of KClO3?
Tuesday, February 14, 2012 at 4:08pm by Kyle

Chem 2
m = mols/kg solvent 0.960m = mols/1 kg mols = 0.960 mols I2 = grams I2/molar mass I2. That assume that the grams I2 calculated actually dissolves in 1 kg ethanol.
Monday, December 17, 2012 at 4:16pm by DrBob222

science
The half-life of uranium-235 is 713 million years. Suppose a fossil originally had 26 grams of uranium-235. A geologist had the fossil tested and found that it now has only 3.25 grams of uranium-235. Approximately how old is the fossil?
Friday, November 22, 2013 at 2:52pm by jim

Chemistry
balance the equation 2CuO+C>>2Cu + CO2 each mole of carbon yields 2mmoles Cu how many moles of Copper is 63.5 grams? answer: 63.5/63.5=1mole so you need half that number of moles of Carbon, or .5 moles of carbon, or six grams.
Sunday, February 23, 2014 at 6:14pm by bobpursley

Algebra 1 Word Problem (Reiny)
You had to have at least 5 L or lemonade so I started there to get $25 I needed at least 15 cupcakes every time I added a lemonade, I needed two less cupcakes until finally I got to 10 lemonades and 5 cupcakes I had to have at least 5 cupcakes, so there it ended
Thursday, January 16, 2014 at 3:42pm by Damon

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