# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,330 questions, page 113-
## Algebra

1. Solve log(4/x) (x^2 - 6) = 2. (note: the (4/x) is underscored) 2. Show that loga [(x + {sqrtx^2-5}) / 5] = -loga (x - (sqrtx^2-5))

*asked by Lily on March 15, 2015* -
## Algebra

Can someone please show me the steps to this problem? I get 0,1 as proposed solutions, but I am not sure about the 1. Thanks Please solve and check all proposed solutions (x-2)/(x-1)+(2)/(x^2-1)= 0

*asked by Rachale on August 4, 2009* -
## physics

The mass of the blue puck shown below is 10.0% greater than the mass of the green one. Before colliding, the pucks approach each other with momenta of equal magnitudes and opposite directions, and the green puck has an initial speed of 8.0 m/s. Find the

*asked by mightymouse on March 23, 2009* -
## Chemistry

Calculate the enthalpy change (ΔH) for: HCl(aq) + NH3(aq) → NH4Cl(aq) The reaction of 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NH3 causes a temperature rise of 6.4 ˚C in the resulting 100.0 mL of solution. The NH4Cl solution has a density of 1.005

*asked by Jim on September 15, 2015* -
## math

Julia measured the high temperature in her town for one week. Using the chart below, find the mean absolute deviation for the high temperatures. Be sure to show your work for finding: graph:sunday:50 monday:56 tuesday:52 wednesday:46 thursday:48 friday:42

*asked by Anon on February 27, 2016* -
## Math

A student has a penny, nickel, dime, and quarter distributed two coins apiece to his front two pants pockets. What is the probability that the front right pocket has more than 30¢ in it? Can you show all work, I am acting as a school teacher who is

*asked by Rena on December 14, 2010* -
## Calculus! Please Help!!

The dollar value of a stock x weeks after a change in management is give by the function: f(x) = x²-14x+30ln(x+1)+32, 0≤x≤7. Find the intervals when the value of the sock was increasing and also determine the maximum value of the stock during this

*asked by Sam on March 17, 2011* -
## statistics

A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 95% confident that her estimate is correct. If the standard deviation is 4.02, how large a sample is needed to get the desired information to be

*asked by Laynette on September 2, 2011* -
## dr bob science

Thanks can you check one more If it takes 105 calories to warm 100g of aluminium from 20oC to 25oC, what is the specific heat of aluminium? Q = MxdeltaTxC 105cal = 100gx (5oC) x C C = .21 cal/gCo we get points off if we do not show our work and just give

*asked by sam on April 25, 2008* -
## chemistry

An insulated beaker contains 250.0 grams of water at 25oC. Exactly 41.6 g of a metal at 100.0oC was dropped in the beaker. The final temperature of the water was 26.4oC. Assuming that no heat is lost in any other way, calculate the specific heat of the

*asked by utna on January 23, 2012* -
## algebra

Please check my work and correct if necessary. Thank You. Using factoring and zero-product property, this is my solution for 9^2-30r+21=-4. 9r^2-30r+21=-4 9r^2-30r+25=0 (3r-5)(3r-5)=0 r=5/3

*asked by Anneliese on April 13, 2017* -
## Chemistry

A solution of 0.316 M KOH is used to neutralize 16.0 mL H3PO4 solution H3PO4(aq) + 3KOH(aq) ¨ K3PO4(aq) + 3H2O(l) If 30.3 mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution? Molarity = ____________

*asked by LuigiR on November 19, 2015* -
## Algebra

Translate to a system of equations. DO NOT SOLVE. A nontoxic scouring powder is made up of 4 parts baking soda and 1 part vinegar. How much of each ingredient is needed for a 16-oz mixture? What are the two equations? For most problems, I can easily find

*asked by Tessa on February 19, 2009* -
## physics

A ball bounces to 34 percent of its original height. *1) What fraction of its mechanical energy is lost each time it bounces? *2) What is the coefficient of restitution of the ball-floor system? - I was able to solve part one and get an answer of .66, but

*asked by David on April 5, 2016* -
## math

1)Which values of x are in the solution set y=3x-1 y=x^2-5x+6 2)6ab (radical8b)-3a radical(32b^3)+9ab (radical5b) 3) write in simplest form (2/x+4/y)/(4x/y-y/x) 4)solve for all values of x 8x^3+4x^2-18x-9 5)abs(4x+6)-4x=-10 6) simplify 4x^-5y7

*asked by ally on January 21, 2012* -
## calculus

solve the following logarithmic equation. Be sure to reject any value of x that is not in the domain of orginal expression. then in the solution set round to two decimals places. Inx=8 I get e^8 But am having a hard time with rounding two decimal places.

*asked by Jennifer on January 1, 2013* -
## chemistry

how do you solve this? What is the pH of the solution created by combining 12.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH wHCl pH wHC2H3O2 12.30 Complete the table below: What are the

*asked by Jin on July 12, 2010* -
## algebra

The velocity of an object fired directly upward is given by the equation V=40-18t, where t is in seconds. when will the velocity be between 22 and 31 feet per second? write and solve a compound inequality and graph the solution on a number line.

*asked by sofia on September 3, 2014* -
## English

Can someone suggest any poems that somehow encapsulates the sentiments of Huckleberry Finn" by Mark Twain? I know of none, but one process you can use that MIGHT work is this: Go to http://www.quoteland.com and wander around until you find something that

*asked by Lillian on August 18, 2007* -
## Physics

A ball is dropped from a height h without air resistance. If the ball falls a distance of h/2 in a time t, how much time is required to fall the remaining h/2? Could you show steps because I don't understand how to work the problem. Thank you.

*asked by Kevin on October 21, 2017* -
## Math - Trigonometry

This is the question: Two aircraft, A and B, leave an airport at the same time. A flies on a course of 81 degrees at 652 km/h, and B flies on a course of 272 degrees at 546 km/h. Calculate their distance apart after 25 minutes to the nearest kilometer.

*asked by Susan on February 12, 2019* -
## Science

an object has a colume of 25 cm3 and a mass of 50g. Antoher object has the same volume of 25 cm3 and a amass of 75 g. Caluculate the densities of both objects. Show all work. INclude the correct unites with your answer.

*asked by Tracey on September 6, 2007* -
## math

at the county fair, the apple pies are lined up sidebyside for judging on a 6 foot table each pie has an areaof 50.24 inches squared. how many pies are on the table?plz show allll work!

*asked by charolette on May 19, 2011* -
## chemistry

A 6.50 g piece of substance B was rolled out into a thin sheet measuring 24.0 cm x 18.0 cm. a.) Calculate the volume of the sheet of metal. Show work; use labels. [I also had to look at a graph, here is some information about substance B: y=mx+b m(slope):

*asked by Taylor on February 15, 2011* -
## Math

At a concession stand, popcorn costs $1.10 and nachos cost $2.35. One day, the receipts for a total of 172 popcorn and nachos were $294.20. How many popcorns were sold. Please show work! I don't understand

*asked by Annie on February 6, 2013* -
## physics

What frequency would a listener hear if a train moves away from the listener at 180 km/hr? The frequency of the horn is 3500 Hz, and the air temperature is 19.0 degrees Celsius. Show work, and include 3 significant figures.

*asked by Anonymous on May 8, 2017* -
## statistics

The director of a health club conducted a survey and found that 23% of memebers used only the pool for workouts. Based on this information, what is the probablity that for a random sample of 10 members, 4 used only the pool for workouts? Please show work

*asked by Harley on June 27, 2011* -
## Physics

"A rocket with mass 1200kg reaches a speed of 300m/s when an explosion breaks it up into two parts with equal mass, and their speeds have a 25m/s difference. What are the speeds and how much energy is released?" Show all work. Thanks!

*asked by Michael on February 3, 2008* -
## physics

Three charges are arranged in a line. From left to right, the charges are: Q1= -8mC, Q2 = +3mC and Q3 = -4mC. The distance between Q1 and Q2 is 0.3 m, and the distance between Q2 and Q3 is 0.2 m. Calculate the net electrostatic force on Q3. how can you

*asked by seb on January 3, 2011* -
## Math

The IQ scores are normally distributed with a mean of 100 and a SD of 15. A) What is the probability that a randomly person has an IQ b/t 85-115? Show work B) Find the 90th percentile of the IQ distribution? C) If a random sample of 100 people are

*asked by Sandy on March 8, 2013* -
## chem

The radius of a single atom of generic element X is 197 picometer(pm) and crystal of X has a unit cell that is face centered cubic calc the volume of the unit cell. Please help and show all work

*asked by Jeremiah on February 19, 2018* -
## Math

Show all work You have 92 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side alongthe river, find the length and width of the plot that will maximize the area.

*asked by Liz on October 25, 2011* -
## math/algebra

Simplify: 3/4/4/5 answer choices are: a) 3/5 b) 5/3 C) 15/16 d)16/15 How do I go about solving this fraction, please show me how to work this. 3/4 divided by 4/5 1. Invert the second fraction. 3/4 / 5/4 2. Multiply the numerators and denominators. What

*asked by Diana on July 15, 2007* -
## PHYSICS

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #2: Suppose the spring in a pinball machine has a spring

*asked by Anna on March 7, 2013* -
## English

Tom made a big show of arriving at work early and leaving later than everyone else, thereby _____ the rumor that he was a slacker. (debunk) Choose the right word: 1. debunk 2. debunks 3. debunking Answer: debunks

*asked by Kimmy on November 5, 2016* -
## Chemistry Grade 12

Given the following equation, C3H8 (g) + 5O2 (g) -> 3CO2 (g) + 4H2O (g); H comb = -2219 kJ/mole A) how much heat will be released when 10 g of propane is burned? B) how much heat will be released when 10 g of water (H2O) is formed? Please show all work.

*asked by Lassie on May 8, 2012* -
## Geometry

A child on top of a lighthouse observes two ships that are 90 ft apart from each other. The angles of the depression of the two ships are 34º and 20º. How far is the closest ship from the base of the lighthouse? I'm sorry, I would show my work, I just

*asked by Katie on February 2, 2015* -
## calculus

I have two questions, please help. 1. Uss completing the square to describe the graph of the following function. Support your answers graphically. f(x)= -2x^2+4x+7 please show work. 2. Can someone help me to graph this function? f(x)=x^2-6x+5 Then find the

*asked by Heather-needing help!!!! on December 18, 2012* -
## algebra

Find the equation of a line that passes through the points (1/3, 2/5) and (–4/5, 1/2). Please put your final answer in standard form (Ax + By = C) and please make sure that there are NO fractions (or decimals) in this answer and that the “x” term is

*asked by Laura on February 10, 2015* -
## Algebra

A manufacture of CD player has monthly fixed cost of 8600 and variable cost of 55 per unit for one particular model. The company sells this model to dealers for 115 each. Which is their function for the profit. Please show all work.

*asked by Daiske on November 10, 2013* -
## geometry

A child on top of a lighthouse observes two ships that are 90 ft apart from each other. The angles of the depression of the two ships are 34º and 20º. How far is the closest ship from the base of the lighthouse? I'm sorry, I would show my work, I just

*asked by Katie on February 2, 2015* -
## Algebra

For this question I answered part A. But I am lost on what I am suppose to do for question B. Given d varies jointly as r and the square of s and inversely as t and d =8 when r=3, s=2, and t=6. A. What is the constant of proportionality? Show your work.

*asked by Ebony on February 16, 2017* -
## Chemistry

I have a test on monday and I NEED to ace it in order to raise my grade > . < ldsfkjaslkf right now, acids and bases are killing me can somebody help me with these problems? A buffer solution is prepared by mixing the weak base ammonia (Kb=1.77x10^-5) with

*asked by Kimberlee on May 15, 2010* -
## science

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*asked by Kyle on January 5, 2015* -
## science

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*asked by Kyle on January 5, 2015* -
## college chemistry

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*asked by Kyle on January 5, 2015* -
## Chem I

Calculate the concentrations of hydronium and hydroxide ions in a solution prepared by dissolving 0.345g of solid NaOH in enough water to make 225mL of solution. Also calculate the pH and pOH of the solution.

*asked by Natalea on November 15, 2010* -
## Chemistry

Why is a blank solution used in absorption spectroscopy? I know it is to nullify the reflection, refraction, and diffraction that occurs, but if the blank solution was a dilute solution rather deionized water, how would the concentration of Cr(VI)in a

*asked by Sandy on February 25, 2014* -
## Chemistry

34.09 ml of 0.251 M KOH is required to tritate a 10.2951 g sample of acetic acid solution. The density of the solution had been previously found to be 1.007g/ml. what is the molarity of the aetic acid solution?.

*asked by sandra on December 6, 2015* -
## chemistry

A sulfuric acid solution containing 571.6g of H2SO4 per of solution has a density of 1.329g/cm3. Calculate (a) mass percentage (b)mole fraction (c) molality (d) molarity of H2SO4 in this solution.

*asked by Anonymous on September 2, 2010* -
## chemistry

20.0mls of a bulk solution was transferred to a 100ml volumetric flask and diluted to volume with water. 2.00mls of this solution was then found to have a concentration of 0.15M. What is the concentration of the bulk solution. McVc=MdVd

*asked by Juggernaut on June 9, 2009* -
## Science

How much sodium hydroxide, at what concentration, do I need to add to 500 mL of 0.1 N HCL to obtain pH 6.8. How do you calculate this? pH = -log(H^+) M HCl = N HCl mols = M x L. After you know mols HCl you have, then make a solution of NaOH and calculate

*asked by Ruby on February 5, 2007* -
## english

I posted a question about the following: Details that show the impact of the problem (effects) on Jack, Ruth and the company Section 2 The steps needed to change the situation Reason to implement each step, including the benefits to your employees, your

*asked by ron on October 30, 2009* -
## chemistry again ..

haphthalen-2-ol dissolved into sodium hydroxide solution to give another solution B. What would be formed when solution B reacted with phenylamine/nitrous acid mixture , butylamine/nitrous acid mixture and ammonia/ nitrous acid respectively ? The resulting

*asked by initial D on December 6, 2008* -
## Chemistry

A solution contains an unknown mass of dissolved silver ions. When potassium chloride is added to the solution, a white precipitate forms. The precipitate is filtered and dried and then found to have a mass of 245 mg. What mass of silver was in the

*asked by Brittany on November 4, 2010* -
## Chemistry (reaction with amine)

haphthalen-2-ol dissolved into sodium hydroxide solution to give another solution B. What would be formed when solution B reacted with phenylamine/nitrous acid mixture , butylamine/nitrous acid mixture and ammonia/ nitrous acid respectively ? The resulting

*asked by initial D on December 6, 2008* -
## Business English

You are a technical writer in a large company, working on a training manual to help new users learn the companys computer system. Employees will use your manual in training seninars taught by your company's trainers. The manual will also serve as an on the

*asked by Lisette on January 31, 2013* -
## Chemistry

A generic solid, X, has a molar mass of 77.7 g/mol. In a constant-pressure calorimeter, 31.2 g of X is dissolved in 289 g of water at 23.00 °C. The temperature of the resulting solution rises to 24.40 °C. Assume the solution has the same specific heat as

*asked by Katherine on November 2, 2014* -
## Chemistry

A student begins with 25 mL of a 0.434 M solution of HI and slowly adds a solution of 0.365 M NaOH. 1. What is the pH after 15.00 ml of NaOH solution has been added? 2. What is the pH after 40 ml of NaOH solution has been added?

*asked by zac on June 3, 2013* -
## Math- Alg 2

Help finding probability involving combinations? What is the probability of winning in this game ( Show calculation and all works) - The board is a number ranging from 1 - 12 - Player place a coin in the desire number 1,2,3,4 etc. - Roll 2 dice - To win

*asked by albertha kurniawan on February 15, 2012* -
## english

Hoe did John mercer langston show his support of Jogn Brown's Harperss Ferry fiasco? I've been looking for the answer for over a week...please help By organizing the Underground Railroad and challenging the Fugitive Slave Act. He also helped organize the

*asked by Danie on September 1, 2005* -
## math

6. If each of eight biology classrooms is in use for 5 hours and 15 minutes per day, and total of 84 student experiments are done, how long does each experiment take on average? A.20 minutes B.30 minutes C. 40 minutes D.50 minutes E.1 hour please show

*asked by Johnny on July 23, 2014* -
## Math 11

The quadratic function f(x)= -1/2(x+3)^2+1. The point (1,1) in the graph of y=x^2 is transformed to which point on the graph of y= -1/2(x+3)^2+1? ***SHOW ALL OF YOUR WORK!!!!! A. (-2,1/2) B. (-2,3/2) C. (-2,-1) D. (5/2,2)

*asked by Johannah on March 3, 2019* -
## Math

What is 23.56 divided by 1000 answer = 0.02356 23.56 x 1000 answer = 23560 can you show me how to work it out.

*asked by DestinyLashea on February 24, 2011* -
## math grade 1

Some bikes ad trikes are on a playground. There are 7 seats and 19 wheels. How many bikes? How may trikes are there? Show work.

*asked by toya on January 7, 2016* -
## Math

If an isosceles triangle has 2 side lenghts of 7 inches and 14 inches, what is the third side? Show you work.

*asked by Blargh on March 20, 2016* -
## math UNIT RATE

an 8 ounce can of tomatoes costs $1.14. an 12 12 once can costs $1.75. which can of tomatoes has the better unit price? PLEASE SHOW WORK

*asked by dani on January 5, 2008* -
## Algebraic limits

The limit as x approaches infinity. (1)/(5^x) The limit as x approaches 1. (1-x^3)/(2-sqrt(x^2-3)) Show your work thanks in advance!

*asked by jawn on September 1, 2009* -
## Geometry

The midpoint of UV is (5,-11). The coordinates of one endpoint are U(3,5). Find the coordinates of endpoint V. (please show work and explain.)

*asked by Faith on September 15, 2016* -
## math help please urgent

the difference of two numbers is 27. the first number is equal to one more than twice the value of the second number. find both numbers. please show work.

*asked by ellis on February 8, 2013* -
## Algebra

How do you simplify the following and please show all work. (-3x(-4 exponent)y(3 exponent) ______________________________ (2x(5 exponet) y(-2 exponent) then the whole equation is in ()with a -2 exponent

*asked by Brandy on October 24, 2007* -
## college algebra

Find the center and radius of the circle (x+3)^2+(y-5)^2=13 I think the center is (-3,5) Radius is (13) but I don't know how to show the work for it.

*asked by debbie on January 22, 2013* -
## science please help

Which of the following factors is the most likely explanation for an energy deficit that results in exercise-induced exhaustion? a. inefficient protein production b. insufficient mitochondrial function c. impaired urea elimination d. absence of oxygen

*asked by john on May 13, 2015* -
## Science

identify the bay, sound, or gulf that serves as base for a) the Sacramento and San Joaquin rivers b) the Alabama River system c) the Connecticut River system Thanks for your help!!!

*asked by ana on February 9, 2009* -
## 3rd grade science

Solar System Project: I would like to know if the moon is between earth and mars. I am making a shoe box model of the solar system. I have to put the planets in order. That's all I need to know. Thanks a bunch!!!

*asked by Miranda on January 18, 2010* -
## trigonometry

5. Find the complete exact solution of sin x = -√3/2. 9. Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. 21. Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two decimal places. 22. Prove that tan^2a –

*asked by eemily on December 13, 2012* -
## Programming

I suppose to write a program that calculates the average of up to 50 numbers input by the user and stored in an array. The program should use a class name Statistics and have an AddNumber method that stores numbers into an arrey one at a time. The class

*asked by Solomon on May 11, 2011* -
## Algebra 1

1. Mr. Lui wrote 15 - 5x/x^2 - 9x + 18. a. Explain what kind of expression it is. b. Simplify the expression. Show your work. c. Identify any excluded values. A: a. It is a rational expression. b. 5/x - 6 c. Excluded value: x = 6 2. Lynne can paint a wall

*asked by Victoria on June 10, 2014* -
## Algebra 1--Please, help me!

1. Mr. Lui wrote 15 - 5x/x^2 - 9x + 18. a. Explain what kind of expression it is. b. Simplify the expression. Show your work. c. Identify any excluded values. A: a. It is a rational expression. b. 5/x - 6 c. Excluded value: x = 6 2. Lynne can paint a wall

*asked by Victoria on June 10, 2014* -
## Algebra 2

Write the standard form of the line that passes through the given points. Include your work in your final answer. Type your answer in the box provided or use the upload option to submit your solution. (-8, 0) and (1, 5)

*asked by Anonymous on January 11, 2016* -
## algebra

Write the standard form of the line that passes through the given points. Include your work in your final answer. Type your answer in the box provided or use the upload option to submit your solution. (3, 1) and (-2, 3)

*asked by austin on February 9, 2016* -
## Chemistry

Calculate the concentrations of all species present in a 0.33 M solution of ethylammonium chloride (C2H5NH3Cl). Okay so i tried doing HA = H + A ice table regular it doesnt work idk what Ka to use. b/c of the chloride. i have to find [C2H5NH2][H+][OH

*asked by Spencer on February 15, 2009* -
## chem

What is the disadvantage of the English system? Please and thank you!!! The advantage of the metric system is that units differ by a factor of 10 (or 100, or 1000, etc) so it makes it easy to convert from one unit to another simply by moving the decimal

*asked by Pyrgus on September 27, 2006* -
## Ap History

Hi i had these questions wrong :/ The North and South held different views toward slavery in 1850. What were they? a) The North believed in a free labor system and the South believed in a slave labor system. b)The South believed that black people were

*asked by Quilla. on December 5, 2014* -
## chemistry

100ml solution made up 1.0M NH3 and (NH4)2SO4 have been added with 100ml of 0.1 HCl. how many moles are present in the solution before and after? given the pH of the solution is 9.26

*asked by gwen on March 1, 2011* -
## Chem Help!!!

A 1.00 mL aliquot of solution A was diluted to 50.00 mL using 0.02 M Fe(III), forming solution B (reaction 2) By looking at this how many moles of sodium salicylate were in the 1.00 mL aliquot used to prepare solution B?

*asked by Erin on April 2, 2017* -
## Chemisty

Which solution contains more acid, 50ml of a 0.20 N HCL solution or 50 ml of a 0.20 N acetic acid solution? Which has a higher hydronium ion concentration? Which has a lower pH?

*asked by Terry on November 21, 2010* -
## Chemistry

A 25.00 mL sample of KNO3 solution was diluted to 1.00X103 mL. The concentration of the final solution is 0.00383 M. Calculate the concentration of the original solution?

*asked by Monica on June 13, 2010* -
## Chemistry

In a acid-base titration, 22.81 mL of an NaOH solution were required to neutralize 26.18 mL of a 0.1121 M HCl solution. What is the molarity of the NaOH solution?

*asked by Jake on February 19, 2009* -
## Science

25 mL sample of KNO3 solution was diluted to 1.000x10^3 mL. The concentration of the final solution is .00383 M. Calculate the concentration of the original solution

*asked by Philip on September 27, 2011* -
## Chemistry

You are titrating 35.00 mL of a 1.20 M solution of HCOOH with a strong base. If you add 1.00 mL of a 3.60 M solution of sodium hydroxide, what is the final pH of the acid solution? The Ka for HCOOH is 1.8 X 10-4.

*asked by Carl on February 24, 2011* -
## Math

Professor Beaker has a 50-milliliter solution containing 60% acid. How many milliliters of pure water should he add to this solution to produce a solution containing 40% acid?

*asked by Glenn on October 12, 2017* -
## Chem

The titration of 25.0 mL of an iron(II) solution required 18.0 mL of a 0.265 M solution of dichromate to reach the equivalence point. What is the molarity of the iron(II) solution?

*asked by Emily on September 30, 2015* -
## chemistry

if A(aq) + B(aq) = AB(aq), and the molarity of A in the solution is 0.60 M and the molarity of B in solution is 0.60M, calculate the enthalpy of the reaction, delta Hrxn, for the formation of 1 mole of AB solution.

*asked by alex on November 1, 2010* -
## AP Chemistry

A given weak acid HZ has a Ka=1.7×10−6. What is the H3O+ concentration of a solution of HZ that has a concentration of 0.78 mol/L? What is the pH of this solution of HZ? What is the percent ionization of HZ in this solution? Answer in units of %

*asked by Gabriella on January 24, 2014* -
## chemistry

if A(aq) + B(aq) = AB(aq), and the molarity of A in the solution is 0.60 M and the molarity of B in solution is 0.60M, calculate the enthalpy of the reaction, delta Hrxn, for the formation of 1 mole of AB solution.

*asked by alex on November 1, 2010* -
## Chemistry

You have a vinegar solution you believe to be 0.53 M. You are going to titrate 20.72 mL of it with a NaOH solution that you know to be 0.974 M. At what volume of added NaOH solution would you expect to see an end point?

*asked by Claire on April 12, 2016* -
## Science

A solution contains 60g of sugar in 480g of water calculate the concentration of solution in terms of mass by mass percentage of the solution

*asked by Subhitcha on April 28, 2016* -
## Chemistry

The nitric acid was purchased as a solution that has 70% HNO3. That volume (mL) of this solution is necessary for preparing 250 mL Solution 2.0 mol L-1? The density of HNO3 (aq) 70% is 1.42 g cm-3

*asked by Adam on May 10, 2016* -
## chemistry

20.0 mL of a 2.2 M lead (II) nitrate solution is mixed with 100.0 mL of a 0.75 M magnesium sulfate solution. What is the concentration of nitrate ions in the resulting solution?

*asked by Anonymous on October 8, 2014*

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