July 6, 2015

Search: 355g sample of a saturated solution of KNO3

Number of results: 27,972

what is the volume of a 2.00 gram sample of helium gas at STP?
March 5, 2009 by crystal

business statistics
If a sample of size 30 is selected, the value of A for the probability p(>- A) = 0.01 is?
August 1, 2009 by Bryant

What does a sample outline look like for a thesis paper
May 29, 2010 by Jodi

a 20.0L sample of hydrogen gas has a mass of 1.80g. What will its density be in g/ml?
July 13, 2010 by Jen

How many grams of iron are there in a sample of Fe3O4 which weighs 8.338 g?
September 20, 2010 by Diggs

How many moles are in a sample of cobalt containing 5.0x10^23 atoms?
October 21, 2010 by Nathan

How old id an artifact if only 1/4 of the hydrogen 3 in the sample remains?
January 5, 2011 by Diane

How many days will it take for 3/4 of a sample of polonium 210 to decay?
January 6, 2011 by Diane

a sample of freshly pressed apple juice has a pH of 3.76. Calculate [H+].
January 20, 2011 by jaycab

what is teh standard error when sample n = 16 mu=150 and sigma = 36
January 30, 2011 by Jokes

What is the sample space for choosing a letter from the word mathematics
April 29, 2011 by mia

Would it be unusual for the mean of a sample of 3 to be 115 or more?
August 2, 2011 by john

What is the density of air if a 5000ml sample has a mass of 0.125?
September 25, 2011 by eliza Higgins

What is the density of air if a 5000ml sample has a mass of 0.125?
September 25, 2011 by eliza Higgins

How would you obtain a sample of the salt potassium chloride?
October 16, 2011 by Muhammad tanvir hussain

What statistical test would be appropriate for a sample size of 25
November 8, 2011 by Tommy

Find t-value for sample size n = 16 and area to the right 0.10
February 22, 2012 by Tina

what is the density of a sample of 65.0 ml of automobile oil having mass of 59.82 g
March 4, 2012 by yvette

create a survey results that have a sample proportion of 23%
March 16, 2012 by douglas

how many grams of magnesium carbonate are in a sample that has 1.58 x 10^24 oxygen atoms?
April 24, 2012 by liz

Can a 100ml sample of 3.0m H2 SO4 could be neutralized by 100 ml of 3.0m NH3
July 16, 2012 by natalie

determine the number of moles of FeSO4 in sample Y that you use
August 2, 2012 by methove

how many calories are required to melt a 135.0g sample of ice at 0.0 c
September 5, 2012 by barb

for a sample of 3 to have a mean of 115 would this be unusual
September 30, 2012 by lillie

A sample of oil has a mass of 65g and a volume of 80.0 mL. What is the density?
October 4, 2012 by sherry

how many atoms are in a sample of 175 g of sodium (Na)? 4.58 x 1024 or 1.42 x 1027?
November 12, 2012 by Anonymous

What is the standard deviation of 31 sample values with a mean of 2954?
February 22, 2013 by glenzy

How many moles of ethyl alcohol C2H6O are in a 25.0 sample? How do I calculate?
March 21, 2013 by Yaneth

Which of the following will increase the strength of a sample of 90% SiO2 - 10% MgO
April 26, 2013 by Anonymous

If a 1.60 M sample of A is heated to 500 K, what is the concentration of B at equilibrium? A(aq)<---> 2B(aq) Kc=9.63x10^-6
April 11, 2014 by Anna

simple randon sampling uses a sample size n
June 30, 2014 by Anonymous

Calculate the number of C atoms in a .25mg sample of C8H10N4O2
September 20, 2014 by frank

Let x1,x2,x3,x4,x5 be random sample of f(x)=(x+1)/2,-1<x<1,zero elsewhere, find P(four of{x1,x2,x3,x4,x5}>0)
December 28, 2014 by assma

Let x1,x2,x3 be random sample of f(x)=exp(-x),x>0,zero elsewhere,if y1=x1/x2,y2=x3/(x1+x2),y3=x1+x2 find g(y1,y2,y3),g(y1),g(y2,y3)
December 28, 2014 by assma

Calculate the volume in milliliters of a 5.41-g sample of a solid with a density of 3.01 g/mL
January 21, 2015 by Drea

Pop. Mean =87 Standard deviation=8 Sample size=64
February 2, 2015 by Denise

What Occurs as a salt dissolves in water? the number of ions in the solution increases and the freezing point decrease the number of the ions in the solution increase and the freezing point increase the # of ions in the solution decrease and the freezing point increase the # ...
March 26, 2007 by Kat

Silly question here, but I am not getting a certain part in the solution in a problem. Evaluate the integral of [(sin(ln(39x)))/x]dx. We are supposed to take u=ln(39x), and get du=(1/x)dx, and the then whole thing is simply solved using integration formulas. But my confusion ...
December 4, 2009 by O_o Rion

calculate the mass of NaOH neded to prepare 500mL of a 0.10 M solution. I'm pretty sure the answer is 2g, but how do I get to that? Another question: calculate the molar amount of KHP used to neutralize the NaOH solution. .51 g of KHP was added to 50 mL of distilled H2O and a ...
October 14, 2007 by Rebecca

In the REDOX reaction in basic solution Zn-->Zn(OH)4+H2 I know that the first half reaction is 4H20+Zn-->Zn(OH)4 +4H+e but the second one is either 2e+2H2O--->H2+2OH (WHICH IS THE ANSWER GIVEN ON THE WORKSHEET) OR 2e+2H-->H2 I think both leads to the same answer= ...
November 4, 2010 by george

A nurse wants to add water to 18 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add? (Hint: Water is 0% benzalkonium chloride.)
September 18, 2011 by N/A

2.) Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is red, and C is yellow. In the reactions in which they participate, they are reduced to A-, B-, and C- ions respectively, all of which are colorless. When a solution of A is mixed with one ...
March 2, 2011 by kate

2.) Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is red, and C is yellow. In the reactions in which they participate, they are reduced to A-, B-, and C- ions respectively, all of which are colorless. When a solution of A is mixed with one ...
March 2, 2011 by kate

Physical Chemistry
Determine the temperature change when 18.0 g of the following salt is dissolved in 190. g of water. The specific heat capacity of water is 4.184 JK-1g-1. The enthalpies of solution in the table are applicable. Do not take the added mass of the salt into account when ...
February 10, 2010 by Trixie

What price do farmers get for their watermelon crops? In the third week of July, a random sample of 51 farming regions gave a sample mean of = $7.08 per 100 pounds of watermelon. Assume that is known to be $1.80 per 100 pounds. Find a 99% confidence interval for the population...
July 7, 2012 by Desperate

Hypothesis Test
A test of hypothesis is performed to determine whether the proportion of Montrealers (population 1) who want the decriminalization of marijuana is greater than the proportion of Torontonians (population 2) who want decriminalization of marijuana. A random sample of 120 ...
November 16, 2013 by Simon

Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 44 male ...
July 19, 2011 by Faith

Algebra Quadratic Equations
When a quadratic equation has one solution, there will be one x-intercept; when there are two solutions, there will be two x-intercepts and when the equation has no solution, the graph will have no x-intercepts",is there another way of determining this?
February 13, 2008 by Marysvoice

25.0 ml of 15% NH4NO3 solution is diluted to 300.0 ml. What is the concentration of the diluted solution? My Work: Total molar mass of NH4CO3 = 80.052 .15 x 80.052= 12.0078 25.0 ml (12.00 M) = 300.0 ml (c2) 300.19/300.0ml = The concentration is = 1.0M
April 15, 2015 by Anonymous

The National AIDS Behavioral Surveys interviewed a sample of adults in the cities where AIDS is most common. This sample included 782 heterosexuals who reported having more than one sexual partner in the past year. We can consider this an SRS of size 782 from the population of...
March 26, 2013 by Anonymous

( / means absolute value) Solve: 3+/2y-1/>=1. Graph the solution set on a number line. The number line I have is: -5 -4 -3 -2 -1 0 1 2 3 4 5 6 First solution: 3+2y-1>=1 2y-4>=1 2y>=5 y>=5/2 I'm stuck b/c I had to correct the first part. I had a whole different ...
February 24, 2008 by Jon

When Ba(NO3)2 and K2CrO4 (sorry, i don't know how to do subscripts, but all the numbers should be subscripts!) react in aqueous solution, the yellow solid BaCrO4 is formed. Calculate the mass of BaCrO4 that forms when 3.50 x 10^(-3) mol of solid Ba(NO3)2 is dissolved in 265 mL...
June 5, 2008 by em

The following is given: 20 ml of HCl (2.0 M) added with 5 ml of Na2S2O3 (0.3 M) with 5 ml of H2O S2O3^-2(aq) + 2H^+1 (aq) --> S (s) + SO2 (g) + H2O (l) Calculate the following: a) Reaction rate when 30 mg of sulphur is formed (in 30 ml of solution) after 55 seconds. b) Rate...
October 20, 2010 by Stephanie

chemistry 12 lab
We did a lab on equilibrium and this is one of the following questions: When Ag ions are added to FeSCN ions (which are red in colour), the colour disappears, and a white precipitate of AgSCN forms. The question is.. Explain why Fe can be used as an indicator in a reaction to ...
November 5, 2010 by cel

solve the logarithmic equation. be sure to reject any value of x that is not in the domain of the orginal logarithmic expression. In square root of x+2=2 (If I try to make the square root sign it will not come out right so I wrote it out instead) What is the exact solution. A...
October 6, 2012 by ladybug

In a coffee-cup calorimeter, 1.91 g of NH4NO3 is mixed with 75.0 g of water at an initial temperature of 25.00oC. After the solution of the salt, the final temperature was 20.94oC. Assuming the solution has a heat capacity of 4.18 J/(goC) and assuming no heat loss to the ...
October 9, 2012 by Shawn

Chemistry - %v/v
1. How many mL of acetone are needed to prepare a 10% v/v solution in 500 mL of methanol? 2. If a 500mL solution of n-propanol in water is prepared with 4mL of alcohol, what is the concentration of alcohol in % v/v? I've never worked with %v/v before so I'm not sure if I ...
June 2, 2013 by double checking

A solution buffered at a pH of 5.00 is needed in an experiment. Can we use acetic acid and sodium acetate to make it? If so, how many moles of NaC2H3O2 must be added to a 1.0L of a solution that contains 1.0 mol HC2H3O2 to prepare the buffer. The Ka of acetic acid is 1.8x10^-5...
June 20, 2014 by Veronica

To dissolve an ionic solid in water, you must first disrupt the ionic bonds that are holding the ionic lattice together. This is an endothermic process, yet many ionic solids have an exothermic heat of solution. (Heat is released when the ionic solid is dissolved.) This is ...
March 17, 2015 by Cortney

In 91% (by volume) isopropyl alcohol (a large [compared to water], flammable molecule) solution, there are only two substances: the alcohol, and water. So when I poured 50 mL of 91% isopropyl alcohol into a graduated cylinder, how many milliliters were alcohol? How many were ...
February 6, 2012 by edward

pure zinc metal into a solution of copper(II) sulfate, the zinc will slowly dissolve to produce zinc sulfate solution, and the copper(II) ion of the copper(II) sulfate will be converted to metallic copper. Write the unbalanced equation for this process. (Include states-of-...
October 2, 2010 by astoeck

chemistry- Thank you
Suppose you add 81 ml of dilute acid to 54 ml of water. Both the water and acid were at room temperature (22 C) before being mixed. The temperature of the solution increased to 42 C. How much energy (in kJ) was released by the dissolution of the acid if the specific heat ...
October 17, 2010 by Jazmin

Chloroacetic acid has a relatively large equilibrium constant, so at low acid concentrations it is necessary to use the quadratic equation in order to calculate the concentrations of the aqueous species. Ka for ClCH2COOH is 1.4 10-3. For the problems that follow, consider ...
June 19, 2010 by leona

Lead(II) nitrate solution reacts with potassium iodide solution to produce lead(II) iodide and potassium nitrate. The answer in the book is: Pb(NO3)2(aq) + 2 KI(aq) ---> 2KNO3(aq) + PbI2(s) I understand how to write and balance the equation. However, I am confused about how...
January 28, 2011 by Jeff

A chemistry student weighs out 0.123 grams of chloroacetic acid into a 250. milliliter volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.2100 moles/liter NaOH solution. Calculate the volume of NaOH solution the student will need...
January 19, 2012 by Deborah

Please check this for me..thank You have a 4.0 L steel tank containing hydrogen gas. You are able to heat or cool the tank and meaurse the pressure of the gas. 1.If you immersed in this solution a semi-permeable sack containing another solution of potassium nitrate prepared by...
April 23, 2012 by cateye

Honors Chemistry
If the percent (mass/mass) for a solute is 20% and the mass of the solution is 300 g, what is the mass of the solute in solution?
May 25, 2010 by Emily

Algebra 2
Solve each equation. 1. (|3x -4|)/(-5) = 6 A: no solution 2. (|2x -5|) = x + 3 A: x = 8 or x = 2/3 Solve each inequality. 3. |5x + 15| > 20 A: x > 1 and x < -7 4. [(|x - 2|)/ (4) greater than or equal to 5 A: -18 < x < 22 5. (-3) x (|5x - 8|)- 5 greater than or...
October 13, 2014 by Victoria

Chemistry. Please help!
A 20.29 g sample of impure MgCO3 is completely decomposed at 1000oC in previously evacuated 2.0 L reaction vessel. After the reaction was complete the solid residue had a mass of 15.9 g. Assume that only MgCO3 could produce gas CO2 what percent of original sample was magnesium...
December 3, 2008 by Jordan

Estimation is best defined as: 1. a process of inferring the values of unknown population parameters from those of known sample statistics 2. a process of inferring the values of unknown samples statistics from those of known population parameters 3. any procedure that views ...
November 24, 2010 by joe

According to the U.S. Federal Highway Administration, the mean distance traveled per shopping trip by Americans was 10.0 miles in 1983. A random sample of 25 shopping trips for this year gave a mean distance traveled of 12.0 miles with a population sample standard deviation (s...
April 26, 2011 by Anonymous

CHEMISTRY plz help
In the accompanying chart are appropriate vapor pressures for benzene and toluene at various temperatures: Temp (C) mmHg Temp (C) mmHg Benzene 30 120 Toluene 30 37 40 180 40 60 50 270 50 95 60 390 60 140 70 550 70 200 80 760 80 290 90 1010 90 405 100 1340 100 560 110 760 d. ...
October 17, 2013 by Aishwarya

Help with lab report Need Help finishing my lab report.KNOWN VALUES ARE V OF HCL=50ML,M=2.188.V OF NAOH=55.3ML,M=2.088.INTIAL TEMP FOR HCL=22.5C,NAOH IS 23C.this is for part A: Mass of final NACL solution assuming that the density of a 1 M Nacl solution is 1.04 g/ml? Heat ...
October 26, 2012 by randy

You are going to be provided with 1 0.50 g sample of magnesium oxide. Treatment of this sample with hydrochloric acid (HCl) will take all of the MAGNESIUM in the oxide and change it into magnesium chloride, MgCl2 You will add 100 ml of 1.0 M HCl to the 0.50 g of magnesium ...
October 1, 2008 by JC

Which word(s) does the clause in CAPS modify? 1.Will you wait UNTIL MR.HAMILTON RETURNS? B.Will wait C.wait B? 2.Our music teacher, Mrs.Goode, offered a solution that SURPRISED US ALL. A.teacher B.Mrs.Goode C.solution D.offered C Are these correct? Thanks -MC
May 13, 2009 by mysterychicken

High school AP chem
The solubility of Mn(OH)2 is 3.04 x 10^-4 gram per 100 ml of solution . A) write the balanced chem equation for Mn(OH)2 in aqueous solution B) calculate the molar solubility of Mn(OH)2 at 25 degrees celcius C) calculate the value of the solubility product constant, Ksp, for Mn...
April 1, 2014 by Chem review question

calculate oh- and ph in a solution in which dihydrogen phosphate ion is 0.335 M and hydrogen phosphate is 0.335 M. This is a homework question, where I have the solution, which is 0.335/0.335, which I get, but then I am supposed to multiply this (1)by a number 6.2x10-8? I have...
April 9, 2015 by Jessica

How would the titration curve of hydrochloric acid solution differ if barium hydroxide was used to titrate instead of sodium hydroxide? How would the titration curve of hydrochloric acid solution with sodium hydroxide differ from the titration curve of acetic acid solution ...
March 6, 2012 by Niki

Ho w

make the
M? A.
October 17, 2014 by Luis

math, help
What are two solutions for 3x-y=0 am i correct on this inorder to graph (0,0) and (2,6) Because the line goes through (0,0) so how do i get two solutions from that line? You can get two solutions from that line because the first solution (0,0) is from the start of the axons x,...
February 10, 2007 by jasmine20

please check my answers. thanxs! Solve the polynomial inequality and graph the solution set on a number line. Express the solution set in interval notation. x^2 - 6x + 5 > 0 -I got (-ininity,1) u (5, infinity) x^2 - 3x - 18 < 0 -I got (-infinity,-3) u (6, infinity) x^2...
October 24, 2007 by Liz

Explain why a buffer made of equal concentrations of HF and F- does not change in pH when a small amount of HCl (a strong acid) is added to the solution. Does the HCl dissociate into ions when it is added to the solution? What do the hydrogen ions react with? Why dont these ...
April 23, 2012 by Anonymous

Explain why a buffer made of equal concentrations of HF and F- does not change in pH when a small amount of HCl (a strong acid) is added to the solution. Does the HCl dissociate into ions when it is added to the solution? What do the hydrogen ions react with? Why dont these ...
May 4, 2012 by Anonymous

radical equation - no solution right?
radical sign (w + 5) = 2 In all my problems there are a letter variable on the end example: radical sign (-u + 30) = u I then square both sides, drop the radical sign then (u+6)(u-5)=0 then check to see if they are both true I guess my question is this is a no solution problem...
October 11, 2007 by Nik H.

What effect on the molar mass of the unknown acid would each of the following have-that is-would it make the calculated molar mass high, low, or would it have no effect? 1. Adding 5 drops of phenolphthalein instead of 1 drop. 2. Using a standard NaOH solution that has been ...
April 3, 2013 by Sean

Can someone please help with this problem to advise how to set up and in the book Essential of Statistics for the Behavioral Sciences. A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n=25 third-...
December 20, 2013 by Lyn

I am very confused on this problem. Any help would be great: 50 g of silver nitrate is mixed with 50 g of hydrochloric acid in a water-based solution. A white precipitate forms (silver chloride.) The solution is filtered and the white precipitate collected and dried. The dried...
June 23, 2009 by Ted

Calculate the molarity of a solution made by adding 33.4 mL of concentrated nitric acid (70.4 % by mass, density 1.42 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 2000 mL of solution. (It is important to add concentrated acid or base...
June 23, 2015 by JO

Envision that you run a highly successful tattoo and piercing parlor in a small West Coast city. You are fairly certain that between you and your key competitor, you have saturated your target audience of people in their teens and 20s. To grow your business, you need to reach ...
September 5, 2012 by Tracey

Consider an equilateral triangle with points located at each vertex and at each midpoint of a side. (See picture.) This problem uses the set of numbers {1, 2, 3, 4, 5, 6}. Place one number at each point. Call the sum of the three numbers along any one side (two vertices and ...
October 10, 2014 by al

Statistics (46)
The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .30. a. How large a ...
May 6, 2014 by Mia

Economics (45)
The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .30. a. How large a ...
May 9, 2014 by Mia

The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .32. a. How large a ...
January 18, 2015 by Anonymous

The phosphorus in a completely dried fertilizer sample weighing 0.4498 grams was precipitated as MgNH4PO4*6H2O. The precipitate weight was determined to be 236.8 mg and ignited to Mg2P2O7. The weight of the ignited precipitate was 268.9 mg. Calculate the percent phosphorus. My...
August 31, 2007 by smiley

A 35.00 mL sample of water at 30.0C is placed in an open container with an external pressure of 1.00 atm. 30.0 kJ of heat is added to the water sample. The density of water is 1 g/mL. (a) How many grams of liquid water remain at the end of the process? Like, the equation I ...
February 11, 2015 by N

When adding 100mL of water to a solution of 50grams of KI in 400mL of water, the total amount of KI in the new solution will be how many grams? Did I miss something here? The total amount of KI, if no extra is added and none taken away, MUST be 50 grams? That is what I thought...
February 25, 2007 by Kellie

The enzyme Y catalyzes the elementary reaction AB-->A + B An enzyme concentration of 1.0M Y can convert a maximum of 0.5M AB to the products A and B per second. What will happen when each of the following is added to a solution that contains 1.0M Y and 0.8M AB? I have to ...
March 22, 2009 by tomi

the vapor pressure of carbon sulfide is 355.6 torr at 25 degrees Celsius. what is the vapor pressure of a solution prepared by dissolving 12.52 g naphthalene (C10H8, 128.2 g/mol) in 125.0 mL CS2 liquid (76.14 g/mol, 1.261 g/mL)? Assume the solution obeys Raoult's law, and ...
March 4, 2015 by alexis

algebra 1 help
1)|J|/5+1=-4 a. no solution b. j=15 or -15 c. j=-25 d.j= -15 my answer is A 2) 1/6|4x-8|=6x a. x=-7, x=11 b. x=8/3, x=8/5 c. no solution d. x=-1/4, x=1/5 my answer is J
April 25, 2013 by hips

chemistry 12
Calculate [H3O^-] in a 0.15M solution of benzoic acid, HC7H5O2(aq) having a Ka of 6.4 x 10^-5 I got. 6.4x10^-5=(x)(x)/0.15 6.4x10^-5= x^2/0.15 6.4x10^-5 x 0.15 = x^2 square root of 9.6x10^-6 = square root of x^2 x= 0.003098 The pH solution is -log [0.003098] = 2.50 b.) ...
October 13, 2011 by shelly

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