Sunday

April 20, 2014

April 20, 2014

Number of results: 102,455

**Math**

Here it is, in a little more detail: (13/102) / (1-13/102) = (13/102) / ((102-13)/102) =(13/102) / (89/102) =13/89 =13:89
*Saturday, November 28, 2009 at 9:26pm by MathMate*

**chemistry please help **

The FM band of radio waves are measured in megahertz (MHz), which are the numbers you see on the radio dial. Therefore, a radio station at 102.5 on the FM dial has a frequency of 102.5 MHz or 102,500,000 Hz. What is the wavelength of the radio station that has a frequency of ...
*Sunday, October 31, 2010 at 9:58pm by Tamina*

**Chemistry..**

mol mass of Al2O3 = 2*27 + 3*16 = 54+48 = 102 fraction of Al in compound = 54/102 so 5 (54/102) = 2.65 kg of Al in the 5 kg of compound
*Monday, December 31, 2012 at 5:20pm by Damon*

**algebra**

102 litre+0.01 m^3=? 102 liters is 102 * 10^-6 m^3 still confused x2+10=
*Saturday, February 3, 2007 at 7:08pm by Marcela*

**Math**

102 = 3.14 x 42.25 x h 102 = 132.665h 102 / 132.665 = h 0.76885388007 = h
*Saturday, March 30, 2013 at 10:36pm by Ms. Sue*

**Chemistry**

If a system has 2.50 × 102 kcal of work done to it, and releases 5.00 × 102 kJ of heat into its surroundings, what is the change in internal energy of the system?
*Friday, November 11, 2011 at 2:33pm by Harley*

**physics**

F = m*g = 21kg * 9.8N/kg = 205.8 N. Fk = u*mg = 0.5 * 205.8 = 102.9 N.=Force of kinetic friction. Fe-Fk = m*a Fe-102.9 = m*0 = 0 Fe = 102.9 N. = Force exerted. Pe = Fe * d/t = 102.9 * 15/20 = 77.18 N. = Power exerted.
*Thursday, October 24, 2013 at 3:05pm by Henry *

**urgent math**

no, you solve the equation ( why would you think to just pick any number ??) 25x + 40(3x) = 14790 25x + 120x = 14790 145x = 14790 divide by 145 x = 102 so they should make 102 units of lumber and 3(102) or 306 units of plywood. check 102(25) + 306(40) = 14790
*Sunday, September 20, 2009 at 3:49pm by Reiny*

**Math**

360*5-sum2= sumlastthree 1800-201= 1599 = sumlast three But all have to be greater than 102 so let the first two be 102, 103, lowest that they can be. 1599-102-103= last digit. so figure the last digit.
*Friday, January 29, 2010 at 1:20pm by bobpursley*

**Arithmetic**

t6 + t15 = -141 t15 - t6 = -7*9 = -63 2 t15 = -204 t15 = -102 t1 = -102 + 14*7 = -4 The sequence is -4, -11, -18, -25, -32, -39, -46, -53, -60, -67, -74, -81, -88, -95, -102 and the first term is -4.
*Thursday, February 11, 2010 at 1:16am by drwls*

**Chemistry **

You have 4.271 x 102 mL of oxygen gas (O2) at 7.656 x 102 mm of Hg and 78 oC. What is the mass of the sample in milligrams? What is the ratio of effusion rates for a light gas, such as HF, to a heavy gas, such as UF4?
*Tuesday, April 16, 2013 at 9:49pm by Tif*

**Physics**

A 1.0 102 g piece of copper at a temperature of 460 K and a 2.0 102 g piece of aluminum at a temperature of 2.2 102 K are dropped into an insulated bucket containing 5.0 102 g of water at 280 K. What is the equilibrium temperature of the mixture? (Use the specific heats found ...
*Monday, November 26, 2012 at 1:03pm by Ray*

**Math**

the vertex is at (214.26,102.51) So, y = C(x-214.26)^2 + k 102.51 = C(0)^2 + k so, k = 102.51 y = C(x-214.26)^2 + 102.51 0 = C(432-214.26)^2 + 102.51 C = -0.002162 y = -0.002162(x-214.26)^2 + 102.51 y = -.002162x^2 + .92646x + 3.25831 y = -.002162(x+3.4885)(x-432)
*Monday, January 23, 2012 at 8:43pm by Steve*

**math**

this is very simple im an 8th grader in algebra 1 and this is just a piece of cake u need to write an equation, total:102 students 4th grade class:3x mrs prides class:x this is a division prob. so ur eq should be 3x=102 x=102/3 x= 34 good luck, hoped this helped u!!!!!:)
*Thursday, January 3, 2013 at 11:07pm by bieber510*

**Chemistry**

A balloon is filled to a volume of 1.0 102 mL at a temperature of 38.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 multiplied by 102 K. What is the final volume of the balloon?
*Friday, June 11, 2010 at 1:43pm by Brittney*

**AP Chemistry**

A balloon is filled to a volume of 2.0 102 mL at a temperature of 33.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 102 K. What is the final volume of the balloon?
*Monday, October 15, 2012 at 3:49pm by Ashley*

**Chemistry**

You have 4.271 x 102 mL of oxygen gas (O2) at 7.656 x 102 mm of Hg and 78 oC. What is the mass of the sample in milligrams? When alcohol evaporates according to the equationC2H5OH(l) --> C2H5OH(g), how many liters of gaseous alcohol, measured at STP, are created by the ...
*Wednesday, April 17, 2013 at 12:55pm by Tif*

**Math**

What is the common difference of the following arithmetic sequence? 102, 100, 98, 96... 2 -2 -1 102 Is it -2?
*Tuesday, November 12, 2013 at 11:47am by Anonymous*

**math**

prob both red = (26/52)(25/51) = 25/102 prob both same colour = 25/102 + 25/102 = 50/102 = 25/51 prob (queen then king) = (4/52)(4/51) = 4/663 prob( black then queen of hearts) = (26/52)(1/51) = 1/102
*Monday, November 26, 2012 at 11:06pm by Reiny*

**chemistry**

A balloon is filled to a volume of 5.0 102 mL at a temperature of 28.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 102 K. What is the final volume of the balloon? the answer i got is v=166.66666667 My question is what is the correct sig. figures...
*Thursday, April 29, 2010 at 8:50pm by chase*

**Algebra**

the sum of the first 102 counting numbers is 102*103/2=10506/2=5253. So the remainder divided by 5250 is 3.
*Monday, April 4, 2011 at 8:18am by MathMate*

**algebra**

0.85x = 102 x = 102/0.85 x = $120
*Wednesday, January 30, 2013 at 9:11pm by Ms. Sue*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*Monday, April 14, 2014 at 11:18pm by Sally*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*Tuesday, April 15, 2014 at 12:59pm by Katie*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*Wednesday, April 16, 2014 at 11:04am by Stacey*

**Physics**

Well, I suppose I am to assume that you stopped in 108 meters. first you went 12.7*.47 = 5.97 m before your foot hit the brake. So the brakes must stop you in (108 -6) = 102 meters That is the answer you asked for. ----------------------------------- The rest of the problem: ...
*Saturday, January 28, 2012 at 3:31pm by Damon*

**Algebra**

-3(x^2+2)=102 x^2+2=102/-3 x^2=-34-2 x=sqrt32
*Sunday, March 7, 2010 at 9:04pm by nancy*

**pre calc**

I assume you wont have a double side on the adjoining sides. If you do this, you have 102 m of perimeter, to do 3 widths (two ends and center fence), and 2 lengths. Area= lw P= 3w+2L or L= 1/2(102-3w) Area= 1/2 w(102-3w) This is easy in calc, but I assume you are not there ...
*Sunday, January 20, 2008 at 5:53pm by bobpursley*

**Chemistry, Urgent!**

Down to moles oxygen = 0.6 is ok. 0.6 moles oxygen means how many moles X2O3 were formed? 0.6 moles O2 x (2 moles X2O3/3 moles O2) = 0.6*2/3 = 0.4 moles X2O3 moles = grams/molar mass rearrange to molar mass = g/moles = 40.8/0.4 = 102 so molar mass X2O3 = 102. So molar mass is...
*Wednesday, May 13, 2009 at 3:31pm by DrBob222*

**chem**

91.4/0.893 = 102.3 grams produced at 100% yield. Using the 102.3, use conventional stoichiometry to solve for Al2O3 initially. Here is a sample problem I posted. http://www.jiskha.com/science/chemistry/stoichiometry.html
*Wednesday, September 15, 2010 at 10:39am by DrBob222*

**MATHEMATICS_algebra**

first such number -- 102 last such number -- 198 (198-102)/6 = 16 but !! ..... let's look at the first 4 of our numbers: 102 108 114 120 if I follow my above method I would get (120-102)/6 = 3 notice I would not be counting the very first number so our answer of 16 should be ...
*Sunday, February 5, 2012 at 8:31am by Reiny*

**Math(Can someone please answer!!)**

ln(.023)=ln(.102)-2360k 2360k=ln(.102)-ln(.023)=ln(.102/.023) k= about 1.49/2360=6.31E-4
*Sunday, March 11, 2012 at 5:45pm by bobpursley*

**chemistry**

I agree with you, mol masses 138 and 102 C7H6O3 + C4H6O3 ---> C9H8O4 + HC2H3O2 360/138 or 2.61 mole of C7H6O3 and therefore 2.61 mol of C4H6O3 2.61 = x/102 x = 267 (I did not carry all the decimal places)
*Friday, January 23, 2009 at 7:52pm by Damon*

**chemistry**

Your answer leaves me with 1.63 so is this wrong moles oxalic acid = 0.500 L x 0.122 M=0.610 the ratio between Fe2O3 and H2C2O4 is 1 : 6 moles Fe2O3 = 0.610/6=0.102 mass Fe2O3 = 0.102 mol x 159.69 g/mol=16.3 g It left me with 16.3
*Monday, October 4, 2010 at 8:49am by amber*

**Math**

What is the cardinal number for the following sets? A) 101,102,103,104,.......121 B) (1,2), (101,102), (0,105)
*Thursday, December 11, 2008 at 4:50pm by Bria*

**Math**

What is the cardinal number for the follwing sets? 1). 101,102,103,104,....121 2). (1,2) (101,102) (0,105)
*Thursday, December 11, 2008 at 6:59pm by Bria*

**Math**

Maybe you should repeat 3rd grade next year. 106 - 104 = 2 104 - 102 = ? 102 - 100 = ?
*Wednesday, February 20, 2013 at 5:28pm by Ms. Sue*

**math**

8' 6" = 102 inches V = 102 * 4 * (1/2) V = 204 cu. in. 204 * 0.25 = _____ weight of iron bar
*Monday, July 16, 2012 at 4:55pm by Ms. Sue*

**chemistry**

A fuel mixture used in the early days of rocketry is composed of two liquids, hydrazine (N2H4) and dinitrogen tetraoxide (N2O4), which ignite on contact to form nitrogen gas and water vapor. 2 N2H4 + N2O4 --> 3 N2 + 6 H2O If 1.50 x 102 g of N2H4 and 2.00 x 102 g of N2O4 are...
*Sunday, November 4, 2012 at 7:38pm by Sheree'*

**MATH RATIO AND RATE**

102/14 = Divide: 102/14 = 7.2857 or 7 2/7
*Monday, December 3, 2012 at 9:22pm by Ms. Sue*

**Money**

86 = x(102) x = 86/102 = .842 100 x = percent = 84.2 %
*Friday, March 14, 2014 at 8:39pm by Damon*

**math**

17 * 6 = 102 seats 102 / 24 = 4 with 6 seats left over
*Monday, March 24, 2014 at 6:48pm by Ms. Sue*

**algebra**

multiply the first equation by negative 2 4x+16y=-84 check the sign, ==42? -4x+6y=-18 add the equations.... 24y=-102 y=102/24
*Thursday, July 5, 2012 at 1:15pm by bobpursley*

**Chemistry**

Question: A sample of Freon-12 (CF2Cl2) occupies 2.261 x 101 L at 337 K and 2.917 x 102 kPa. Find its volume (in L) at standard temperature and pressure (STP). Equation: p1v1/t1=p2v2/t2 My Work: (2.917 x 102 kPa)(2.261x101 L)/337K = (101.3 kpa)( x )/273 k My Answer: 543.4 L Is...
*Wednesday, July 13, 2011 at 12:06am by Bradley*

**chemistry**

what is (in)? what does =102 mean?
*Wednesday, January 20, 2010 at 7:09pm by bobpursley*

**algebra**

OK, typing on here requires more parentheses than in a book where you can set up type : 5/8 = 5 / (2 * 2 * 2) 2/15 = 2 / (5*3) 17/20 = 17/2*5*2 least common denominator is 2*2*2*3 *5 = 8*15 = 120 so I multiply all terms by 120 120(5/8) t + 120(2/15) t = 120 (17/20) 75 t + 16 t...
*Thursday, February 21, 2008 at 8:33pm by Damon*

**Math**

To find the value of a,divide both sides by 10. 10a = 102 a = 102 / 10 a = 10.2
*Saturday, November 23, 2013 at 12:54pm by Ms. Sue*

**Mathematics-please help!**

9/28 + 3/(x+2) = 3/4 Multiply both sides by 28: 9 + 84/(x+2) = 21 LCD = (x+2). 9(x+2)/(x+2) + 84/(x+2) = 21 Combine like-terms in numerators: (9x + 102)/(x+2) = 21 Cross multiply: 21x + 42 = 9x + 102 21x - 9x = 102 - 42 12x = 60 X = 5.
*Saturday, June 9, 2012 at 7:42am by Henry*

**Chemistry**

(39.0 x 9/5)+32.0 = 102.2 F.
*Wednesday, June 15, 2011 at 7:02pm by DrBob222*

**math**

60 * 85 = 5100 2550/25 = 102 2550/20 = 127 + 10 over 102 + 127 = 229 I guess you are right.
*Monday, March 18, 2013 at 7:55pm by PsyDAG*

**Statistics**

98,99,99,103,101,102,104,89,87,90,90 Within how many standard deviations of the mean is the value 102?
*Tuesday, June 5, 2012 at 3:30pm by Anonymous*

**Statistics**

87,89,90,90,98,99,99,101,102,103,104 Within how many standard deviations of the mean is the value 102?
*Tuesday, June 5, 2012 at 4:06pm by Anonymous*

**math**

If you have 5 items with a mean of 98, then the sum of all items is 5*98 = 490 If you have 6 items with a mean of 102, the total is 6*102 = 612 Other than that we know nothing. Now, if you meant to say that adding the 6th item raised the mean from 98 to 102, then the 6th item ...
*Thursday, September 29, 2011 at 10:26pm by Steve*

**chemistry**

At what temperature (in ) does acetone have = 102
*Wednesday, January 20, 2010 at 7:09pm by aamani*

**physics**

d = 2pi*r, d = 6.28*55 = 345.6m = Linear distance, d = 0.5*at^2 = 345.6 m, 0.5a*(14.3)^2 = 345.6, 102.2a = 345.6, a = 345.6 / 102.2 = 3.38 m/s^2.
*Tuesday, October 26, 2010 at 9:36pm by Henry*

**Physics**

On the moon the surface temperature ranges from 395 K during the day to 1.02 x 102 K at night. Convert these temperatures to the Celsius and Fahrenheit scales. (a) 395 K in degrees Celsius; (b) 395 K in degrees Fahrenheit; (c) 1.02 x 102 K in degrees Celsius; (d) 1.02 x 102 K ...
*Tuesday, December 11, 2012 at 10:55am by Anonymous*

**trig**

Draw a diagram. vertical line for the tree, line OT slanting line going down to the right at an angle if 15 degrees, of length 102, OS Angle OTS is 62 degrees. Angle TOS = 105 degrees. so, angle OST = 13 degrees Using the law of sines, the height of the tree, OT is given by OT...
*Tuesday, November 8, 2011 at 1:15am by Steve*

**chemistry-Buffer Q**

Yes, you would have concn BUT M = moles/L so if you know moles and M you can calculate L and convert to mL. I think you have the right idea; you just quit too soon. moles NH3 = 1.74/17.03 = ? moles (NH4)2SO4 = 4.19/132.14 = ? and that x 2 = about 0.0628 ...........NH3 + H...
*Monday, November 14, 2011 at 6:47pm by DrBob222*

**physics**

Required volume flow rate: 164m^3/(26.8*60 s) = 0.102 m^3/s That equals (Area)*(Velocity). For a square duct, Area = a^2. a is the side length of the square. a = sqrt(0.102/V) Plug in the numbers. Solve for a.
*Sunday, April 15, 2012 at 8:20am by drwls*

**Chemistry-102**

Use the Henderson-Hasselbalch equation.
*Sunday, March 27, 2011 at 5:52pm by DrBob222*

**chemistry**

hexyl alcohol is 102 propyl ether is 98
*Thursday, April 1, 2010 at 12:03am by DrBob222*

**Chemistry**

What is the freezing point of an aqueous solution that boils at 102.1 C?
*Monday, April 26, 2010 at 5:26pm by Justin*

**chemistry**

delta T = 102.37-100 = ? i = 3 Kb = 0.512 m = ?
*Monday, May 13, 2013 at 11:53am by DrBob222*

**chemistry university**

is it 102 mg rounded to 3 significant figures.
*Monday, April 15, 2013 at 4:45am by angela*

**Chemistry**

a.) 102 b.) 64 c.) 198 d.) 34 Please check them
*Friday, March 14, 2014 at 9:54pm by Anonymous*

**Please help with steps: Geometry**

Two mountain bikers have been separated and are hoping to find each other. One biker reads on her GPS that she is located at 102.9 degrees west and 44.1 degrees north. She decides to ride towards the mountain peak, which on the map has the coordinates 102.5 degrees west and 44...
*Wednesday, November 2, 2011 at 8:23pm by Erika*

**math**

errrgg..i meant i figured out #2 i need help with #1. My formula is as instructed. B=a/p (Base=amount/percent) My answer is: B=102.00/0.15 B=6.80 so the regular prices is 102.00+6.80=108.80 Is that correcT?
*Thursday, February 11, 2010 at 7:01pm by marco*

**algebra**

You can find the sum of the first 102 counting numbers using Gauss's method, namely: "the sum of the first n counting numbers is n*(n+1)/2" whether n is odd or even. For n = 102, the sum is 102*103/2=10506. So divide 10506 by 5220 to get a quotient of 2, with a remainder of 66...
*Monday, April 4, 2011 at 8:11am by MathMate*

**Discrete Math**

Yes, there's a typo. It's actually 3+4+4+4+4+5+6=30 and there's a graph included in this problem but I don't know how to show the graph so that was why I just described how it looked like with all the vertices and degrees of each. Let me list those vertices and edges: MCS100 ...
*Friday, April 22, 2011 at 1:09am by yengiang*

**chemistry**

At what temperature (in degrees C) does acetone have Pvap= 102 mmHg?
*Monday, January 25, 2010 at 9:00pm by Lauren*

**Chemistry**

Wait never mind I figured it out. 1/F = F so 1/102 right?
*Tuesday, April 13, 2010 at 8:37pm by Amphee*

**Chemistry-102**

Alright I have the equation but I still don't get how to set it up.
*Sunday, March 27, 2011 at 5:52pm by Christian*

**Chemistry**

A sample of nitrogen gas is confined in a 8.494 L container at 2.643 x 102 torr and 50 oC. How many moles of gas are present in the sample? So I thought I set this problem up right and when I type the answer into CALM my answer is incorrect. This is what I did: PV=nRT (2.643 x...
*Monday, January 20, 2014 at 4:50pm by Cassie*

**Chemistry**

Calculate molar masses and show that they add up on both sides. For example, the first one. KClO3 is 122.549 and 2 moles would be 2 x 122.549 = 245.098. On the right we have 2 x 74.551 = 149.102 for 2KCl 3 x 31.9988 = 95.9964 149.102+95.9964 = 245.098 so the product decomposes...
*Monday, April 5, 2010 at 1:36pm by DrBob222*

**Math whoops**

whoops 102 = 2*51 = 2*3*17 15 = 3*5 27 = 3*3*3 36 = 2*2*3*3 16 = 2*2*2*2 28 = 2*2*7 57 = 3*19 102 = 2*51= 2*3*17 268 = 2*2*67 4518=2*2259 = 2*3*753 = 2*3*3*251 93 = 3*31
*Monday, November 28, 2011 at 6:07pm by Damon*

**math**

Thanks. I was translating the problem incorrectly. I got the right answer using the formula A=P*B A=15*102 A=15.30 15.30 + 102.00 = 117.30 Thanks.
*Thursday, February 11, 2010 at 7:01pm by marco*

**math**

Thanks. I was translating the problem incorrectly. I got the right answer using the formula A=P*B A=15*102 A=15.30 15.30 + 102.00 = 117.30 Thanks.
*Thursday, February 11, 2010 at 7:01pm by marco*

**Chemistry 102**

By looking up the solubility product of AgCl. It will help to know if Ag2SO4 has a Ksp or not.
*Wednesday, April 21, 2010 at 6:26pm by DrBob222*

**Chemistry**

(a) q = mass x specific heat x delta T q = 102 x 4.184 x (41-21)
*Tuesday, June 7, 2011 at 8:25am by DrBob222*

**Chemistry**

How do you tell the difference between reactants and products with no arrow? And 1.3 102 means what?
*Sunday, December 2, 2012 at 4:36pm by DrBob222*

**Chemistry**

What is the molarity of a 5.00 x 102 ml solution containing 2490 g of KI?
*Sunday, August 18, 2013 at 7:59pm by Victoria*

**chemistry**

Determine the energy of a photon with a wavelength of 6.74 ✕ 102 nm.
*Saturday, November 9, 2013 at 8:53pm by aaliyah*

**statistics**

98,99,99,103,101,102,104,89,87,90,90 Find the 25th and 75th percentiles. Within how many standard deviations of the mean is the value 102. Find the interquartile range.
*Monday, June 4, 2012 at 8:09pm by Anonymous*

**Math**

Most of the time, you would convert numbers from "foreign" bases to base 10, then convert to the target base by division. From a number in base n, we recognize that each digit from the right represents n^x, where x is the position from the right. So 2526 = 2*6² + 5*6¹...
*Wednesday, June 30, 2010 at 9:03pm by MathMate*

**Chemistry**

HCl + NaHCO3 => H2O + CO2 + NaCl Convert the 0.102 g CO2 to g NaHCO3. 0.102g CO2 x (molar mass NaHCO3/molar mass CO2) = 0.102 x 84/44 = 0.195. Is that 0.195 you posted what you obtained. Then %NaHCO3 = (0.195/0.358)*100 = about 54.4%. Check that. If your earlier reply meant...
*Friday, October 19, 2012 at 10:08pm by DrBob222*

**math**

(-130)-p=102 -p = 102 + 130 p = -232
*Thursday, September 19, 2013 at 9:54pm by Ms. Sue*

**Math**

Worked for 15.75 hours? Paid $102.375??? 102.375/15.75 = $6.50 per hour
*Wednesday, October 17, 2012 at 8:47pm by Ms. Sue*

**Algebra 2**

hard to show long algebraic division on this forum_search_20140419, I hope you are familiar with synthetic division It will look something like this 3 | 3 4 -7 6 ........9 39 84 ... 3 13 32 102 so (3x^3+4x^2-7x+6) / (x-3) = (3x^2 + 13x + 32) + 102/(x-3)
*Saturday, March 31, 2012 at 2:36am by Reiny*

**chem**

C2H4Br2 + 3 I- -> C2H4 + 2Br- + I3- [C2H4Br2]M [I1]M Initial Rate (M/s) 1 0.127 0.102 6.45 x 10-5 2 0.343 0.102 1.74 x 10-4 3 0.203 0.125 1.26 x 10-4 Determine the order of the reaction in C2H4Br2:
*Sunday, February 4, 2007 at 5:24pm by kim*

**organic chemistry**

102% probably not a valid response. My best guess is that the crystals were not dry.
*Monday, June 14, 2010 at 9:19pm by DrBob222*

**Chemistry**

Calculate the number of moles in these quantities. 1. 25.0 g KNO3 2. 5.4 x 102 g (NH4)2C2O4
*Sunday, March 20, 2011 at 12:23am by Netta*

**CHEM**

Use PV=nRT This will give you the number of moles. 143.289-143.187 = 0.102 is the mass of n moles so 0.102/n is the molar mass or mass of one mole.
*Tuesday, July 22, 2008 at 1:40am by Dr Russ*

**math**

2 + 10 = 12 12 + 20 = 32 32 + 30 = 62 62 + 40 = 102 102 + ? = ______?
*Tuesday, February 5, 2013 at 4:28pm by Ms. Sue*

**chemistry**

R is 0.08206 with V in L and P in atm. R is 8.314 with V in L and P in kPa. By the way, I have no idea what the 0.455 is in your post and there are no units. I ignored it. 0.0103 is n either way. n = (PV/RT) = (772 x 0.250)/(760 x 0.08206 x 300) = 0.0103 = n 772 x 101.325/760...
*Wednesday, August 31, 2011 at 6:51am by DrBob222*

**math**

What the patters is supposed to show is.. in 537^102 you only have to look at what happens to the ones digit e.g. 537^0 = 1 vs 7^0 = 1 537^1 = 537 vs 7^1 = 77 537^2 = 288369 vs 7^2 = 49 537^3 = 157854153 vs 7^3 = 343 537^4 = 8315....1 vs 7^4 = 2401 notice the last digit is ...
*Friday, October 21, 2011 at 8:21pm by Reiny*

**geometry**

I drew the vector for ship # 1 @ 0 deg and ship # 2 @ 140 deg. d1 = 26 mi / h * 3 h = 78 mi @ 0 deg. d2 = 34 mi / h * 3 h = 102 mi @ 140 deg. d = 102 mi @ 140 deg - 78 mi @ 0 deg. X = hor = 102 * cos140 - 78cos0, = -78.1 - 78 = - 156.1 mi. Y = ver = 102sin140 - 78sin0 = 65.6...
*Thursday, November 4, 2010 at 1:14am by Henry*

**Physics**

A 3.60 102-kg piano is being lifted at a steady speed from ground level straight up to an apartment 18.0 m above the ground. The crane that is doing the lifting produces a steady power of 4.00 102 W. How much time does it take to lift the piano?
*Monday, February 25, 2008 at 3:48pm by Peter*

**MATH Prob.**

the prob of a spade and a heart = 2(13/52)(13/51) = 13/102 so the prob of NOT a spade and a heart = 1 - 13/102 = 89/102 so the odds in favour of drawing a spade and a heart is 13:89
*Tuesday, August 11, 2009 at 11:38pm by Reiny*

**Chemistry**

A brownie contains 1.30 ×102 mg of sodium. What is this mass equivalent to it in units of grams?
*Sunday, February 20, 2011 at 11:17pm by Des*

**chemistry**

For each of the following explain how you would prepare 1.0 L of a solution that is 0.10 M in K+. Repeat for concentrations of 1.0 × 102 ppm K+ and 1.0% w/v K+.
*Wednesday, September 12, 2012 at 12:44pm by Anonymous*

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