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March 23, 2017

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Posts by dee

Total # Posts: 927

Chemistry
Use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. I absolutely have no idea what to do, please help me!
April 30, 2013

Chemistry
Oh I see what I did wrong! Thanks!
April 30, 2013

Chemistry
i got -1,279.89 and still got it wrong..doing the same calculations just fixing the 468.25 where it belongs
April 30, 2013

Chemistry
For a particular reaction at 195.1 °C, ΔG = -1488.09 kJ/mol, and ΔS = 288.67 J/(mol·K).? Calculate ΔG for this reaction at -20.0 °C. delta G = delta H - (T*delta S) -1488.09 kJ/mol = (delta H) - ((461.8K)*(+288.67 J/(mol x K))*(1 kJ/1000 J)) -1488...
April 30, 2013

geometry
Find the weight to the nearest kg, of the cement block. Cement weighs 1700 kg/m3. 12cm x 10cm and 40cm x 20 cm x 20cm.
April 20, 2013

statistics
It takes approximately 15 minutes to code one record. How many personnel hours would be needed to code 1,424 discharges for the month?
April 15, 2013

Chemistry
So i got Ka = X^2/(0.184-x) not sure what to do next.
April 11, 2013

Chemistry
The Ka of a monoprotic weak acid is 4.47 × 10-3. What is the percent ionization of a 0.184 M solution of this acid?
April 11, 2013

physics
A solid steel cylinder is standing (on one of its ends) vertically on the floor. The length of the cylinder is 3.4 m and its radius is 58 cm. When an object is placed on top of the cylinder, the cylinder compresses by an amount of 5.9 10-7 m. What is the weight of the object?
April 3, 2013

physics
A copper cube, 0.31 m on a side, is subjected to two shearing forces, each which has a magnitude F = 6.40 106 N (see the drawing). Find the angle θ (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.
April 3, 2013

Cal
Find the critical number of the function. g(t) = | 4t - 9 |
April 3, 2013

Chemistry
At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.100 M and [NO]=0.500 M. The balanced chemical equation is N2+O2<--->2NO. If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after ...
April 2, 2013

Chemistry
If a 4.30 M sample of A is heated to 500 K, what is the concentration of B at equilibrium? A(aq) --><--- 2B(aq) Kc=8.54 x 10^-6 at 500K ---><--- = equilibrium
April 2, 2013

Chemistry
At a certain temperature, the Kp for the decomposition of H2S is 0.755 H2S (g) <-- --> H2 (g) + S (g) Initially, only H2S is present at a pressue of 0.201 atm in a closed container. what is the total pressure in the container at equilibrium?
April 2, 2013

Chemistry
Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) ⇌ PCl3(g) + Cl2(g) A 0.304 mol sample of PCl5(g) is injected into an empty 4.75 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.
April 2, 2013

Chemistry
At a certain temperature, the equilibrium constant for the following chemical equation is 2.00. At this temperature, calculate the number of moles of NO2(g) that must be added to 2.64 mol of SO2(g) in order to form 1.10 mol of SO3(g) at equilibrium. SO2(g) + NO2(g) <--->...
April 2, 2013

Physics
The drawing shows a sulfur dioxide molecule. It consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the data provided in the drawing, find (a) the x coordinate and (b) the y coordinate of the center of...
April 1, 2013

Cal
lim_(x->0^+)(tan(9x))^x
March 27, 2013

chemistry
How many grams are in 4.00mol of sodium chloride (\rm NaCl)
March 24, 2013

Science
How does the number of neutrons in a stable nucleus compare with the number of protons?
March 22, 2013

Science
If the half-life of a radionuclide is 1 month, is a sample of it completely decayed after 2 months?
March 22, 2013

physical science
What physical quantities are governed by the quantum numbers of an atomic electron?.
March 22, 2013

Physics
A half-atwood machine is constructed, as shown in the drawing below. The table is NOT frictionless, M1 is 50 grams, and M2 is 30 grams. Mass M2 descends 32 cm in 18 seconds. Find the tension in the wire.
March 21, 2013

phical science
Photons and neutrinos have neither charge nor mass. What are the differences between them?
March 18, 2013

Cal
Differentiate the function. f(x) = sin(x) ln(2x)
March 14, 2013

math
nevermind, all figured out. thanks!
March 11, 2013

math
oops, yes carrot cakes...typed too fast. still don't understand, can you explain it better for me please?
March 11, 2013

math
castor brought 6 3/4 carat cakes to share with 26 students. did castor bring enough for each student to have 1/4 of cake?
March 11, 2013

Cal 1
Use Newton's method with the specified initial approximation x1 to find x3, the third approximation to the root of the given equation. (Round your answer to four decimal places.) 1/3x^3 + 1/2x^2 + 1 = 0, x_1 = −3
March 7, 2013

Cal 1
Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answer to two decimal places.) tan x ≈ x
March 7, 2013

Cal 1
Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answers to three decimal places.) (1 + 2x)^1/4 ≈ 1 + 1/2x
March 7, 2013

Cal 1
Find the linearization L(x) of the function at a. f(x) = x^4/5, a = 32
March 7, 2013

Physics
A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
March 6, 2013

Physics
A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
March 6, 2013

Physics
A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
March 6, 2013

Physics
A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
March 6, 2013

Physics
A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
March 6, 2013

Physics
A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
March 6, 2013

Physics
A ladder (L = 7.80 m) of weight WL = 360 N leans against a smooth vertical wall. The term "smooth" means that the wall can exert only a normal force directed perpendicular to the wall and cannot exert a frictional force parallel to it. A firefighter, whose weight is ...
March 4, 2013

Physics
Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires and the road is...
March 4, 2013

chemistry
wait is it 79.57g?
March 2, 2013

chemistry
delta t = i*Kf*m m = mols/kg solvent 4= (3)(1.86) m= 0.717 (0.717)(1000) = 0.000717mol 0.000717mol/110.98g/mol = 6.46 x 10^-6g
March 2, 2013

chemistry
is the answer 0.079g or 0.00000646g ? I'm not sure if I've done it correctly.
March 2, 2013

chemistry
If Kf = 1.86C/m, how many grams of calcium chloride must be added to 1.0L of water (assume a density of 1.0 g/mL) to lower the freezing point 4.0 C?
March 2, 2013

Chemistry
Imagine two solutions with the same concentration and the same boiling point.? Imagine two solutions with the same concentration and the same boiling point, but one has ethanol as the solvent and the other has carbon tetrachloride as the solvent. Determine that concentration ...
March 2, 2013

Chemistry
A solution is made by mixing 37.0 mL of ethanol, C2H6O, and 63.0 mL of water.? Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C? ethanol: 0.789 g/mL 43.9 torr water : 0.998 g/mL 17.5 torr
March 2, 2013

Math
Find the number of each kind of object in the collection Miranda has 24 CDs in her collection. Of those CDs, 10 are pop CDs. She has 6 more country CDs than jazz CDs. How many country CDs does Miranda have?
March 1, 2013

physics
Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires and the road is...
February 28, 2013

physics
A kite is hovering over the ground at the end of a straight 47-m line. The tension in the line has a magnitude of 14 N. Wind blowing on the kite exerts a force of 17 N, directed 55° above the horizontal. Note that the line attached to the kite is not oriented at an angle ...
February 28, 2013

Chemistry
The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of acetone in the solution? Show work. A) 0.69 B) 0.32 C) 0.13 D) 0.045 E) 0.87
February 27, 2013

Chemistry
Isoamyl salicylate (м = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL)
February 27, 2013

math
500000
February 25, 2013

Chemistry
Explain how you would prepare 100.0 mL of 0.500 M NaCl solution. Include the appropriate glassware and calculations.
February 25, 2013

math
A two digit number has the property that the units digit is 4 less than the tens digit and the tens digit is twice the units digit. What is the number?
February 18, 2013

Physics
A model rocket launches with an initial velocity of 6 m/s, at an angle of 90 degrees (with respect to the horizon). The rocket's engine provides an acceleration of 2.2 m/s2, acting in the same direction as the initial velocity. After 20 seconds, the rocket engine cuts out...
February 15, 2013

physics
A spacecraft is on a journey to the moon. At what point, as measured from the center of the earth, does the gravitational force exerted on the spacecraft by the earth balance that exerted by the moon? This point lies on a line between the centers of the earth and the moon. The...
February 12, 2013

physics
The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force SM that the sun exerts on the moon is perpendicular to the force EM that the earth exerts on the moon. The masses are: mass of sun = 1.99 1030 kg, mass of earth = 5.98 1024 kg, ...
February 7, 2013

physics
The weight of an object is the same on two different planets. The mass of planet A is only forty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.
February 7, 2013

physics
A rocket of mass 4.5 105 kg is in flight. Its thrust is directed at an angle of 45.5° above the horizontal and has a magnitude of 7.60 106 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the horizonal.
February 7, 2013

math
How to name 3300 in 4ways
February 7, 2013

Movement and Music
which of the following best describes the realation between movement and music a movement and music are parteners because they enhance each other and provide enjoyment
February 7, 2013

English II
I have to write an satire and I am doing it on the movie The Help.
February 3, 2013

physics
A hot-air balloon is rising straight up with a speed of 6 m/s. A ballast bag is released from rest relative to the balloon at 7 m above the ground. How much time elapses before the ballast bag hits the ground?
January 31, 2013

physics
Search: On a pleasure cruise a boat is traveling relative to the water at a speed of 5.4 m/s due south. Relative to the boat, a passenger walks toward the back of the boat at a speed of 1.4 m/s. (a) What is the magnitude and direction of the passenger's velocity relative ...
January 31, 2013

physics
In a marathon race, Chad is out in front, running due north at a speed of 3.92 m/s. John is 92 m behind him, running due north at a speed of 4.33 m/s. How long does it take for John to pass Chad?
January 31, 2013

physics
A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 16.1 m/s at an angle of 41.1° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
January 31, 2013

physics
A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 16.1 m/s at an angle of 41.1° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
January 31, 2013

Physics
A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +0.8 m/s and ax = +0.9 m/s2. The y components of the puck's initial velocity and acceleration are ...
January 31, 2013

Physics
As a tennis ball is struck, it departs from the racket horizontally with a speed of 28.2 m/s. The ball hits the court at a horizontal distance of 19.5 m from the racket. How far above the court is the tennis ball when it leaves the racket?
January 30, 2013

Physics
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.050 s, during which time it experiences an acceleration of 390 m/s2. The ball is launched at an angle of 46° above the ground. Determine the horizontal and ...
January 30, 2013

Physics
A meteoroid is speeding through the atmosphere, traveling east at 19.0 km/s while descending at a rate of 12.9 km/s. What is its speed, in km/s?
January 30, 2013

MATH
AMANDA TEST SCORE ON SIX TESTS WAS 94. FIVE OF THE SIX TEST SCORES WERE 88, 94, 93, 95 & 99. WHAT WAS THE SIXTH TEST SCORE?
January 29, 2013

Math 104
A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows: 34 said they drove alone. 24 rode in a carpool. 28 rode public transportation. 3 used both carpools and public transportation. 3 used both a carpool and ...
January 19, 2013

statistics
The company policy for customer service representatives gives time off for positive reviews. If, in the first 20 calls a customer service agent handles in a day, 13 or more elect to take a subsequent survey and rate the service as “excellent”, then the company gives ...
January 10, 2013

Business math
$1,097.51?
January 5, 2013

algebra 2
The label on a prescription bottle directs the patient to take the medicine twice a day. The effective ingredient of the medicine decreases continuously at a rate of 25% per hour. If a dose of medicine containing 1 milligram of the effective ingredient is taken, how much is ...
December 20, 2012

physics
A student is skateboarding down a ramp that is 6.88 m long and inclined at 16.9 degrees with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp 2.54 m/s. Neglect friction and find the speed at the bottom of the ramp in m/s.
December 19, 2012

chemistry
What is the type of glycosidic bond in case alpha?
December 16, 2012

chemistry
When disaccharide beta is hydrolyzed, which monosaccharide units are produced?
December 16, 2012

chemistry
When disaccharide alpha is hydrolyzed, which monosaccharide units are produced? A) D-glucose and D-fructose monosaccharide units B) two D-fructose monosaccharide units C) two D-glucose monosaccharide units
December 16, 2012

Chemistry
When disaccharide alpha is hydrolyzed, which monosaccharide units are produced? A) D-glucose and D-fructose monosaccharide units B) two D-fructose monosaccharide units C) two D-glucose monosaccharide units
December 16, 2012

Chemistry
What mass of solid sodium acetate, NaCH3COO, must be added to 2.50 L of an aqueous solution of 0.55 M acetic acid, CH3COOH, in order to make a buffer solution whose pH is 4.50? Assume that adding the solid does not change the volume of the solution.
December 15, 2012

Statistics
62.Refer to the Baseball 2009 data, which report information on the 30 Major League Baseball teams for the 2009 season. a. At the .05 significance level, can we conclude that there is a difference in the mean salary of teams in the American League versus teams in the National ...
December 1, 2012

algebra
f(x)=-2+5 sketch a graph
November 30, 2012

science
The force that every mass exerts on every other mass is called _________. A. gravity B. pull C. matter D. weight
November 27, 2012

coversion
150lbs= how many kg when 1kg=2.2 lbs
November 21, 2012

Chemistry
1.90X10^19 it would remain the same
November 17, 2012

chemistry
If 8.00g of methane is burned with 6.00g of oxygen. How much methane,oxygen,carbon dioxide,and water remain after the reaction is complete in grams?
November 12, 2012

physis
A box slides downwards at a constant velocity on an inclined surface that has a coefficient of friction uK = .58 The angle of the incline, in degrees, is most nearly:
November 9, 2012

Chemistry
A 1.30-L sample of argon gas is at 1.02 atm and 21.5 degrees Celsius. a. what mass of argon is in the container. b. If the temperature is raised to 500 degrees celsius while the volume remains constant, calculate the new pressure, in stmospheres.
November 9, 2012

chemistry
a 55g aluminum block initially at 27degrees C absorbs 725J of heat. What is the final temp. I know I need to use the equation q=m*Cs*Delta T but I cannot figure out how to rearrange the equation to isolate Tf to get the answer. Thanks for any help.
November 4, 2012

math
I NEED HELP TO!!!!! SOMEONE PLEASE HELP!!!
November 2, 2012

intermediate algebra
a basketball player scores 35 times during a gam,e. he scored 57 total point 2 for each 2 point shot and one for each free throw how many two pint shots did he make and how many free throws did he make
October 29, 2012

Algrebra
substitution method 3x + y=12 8x-2y =4
October 29, 2012

Math
Find two numbers whose ratio is 4 to 3 and are such that the sum of their squares is 100.
October 29, 2012

math
an artist is going to an art fair. the artist will charge $20 for small prints $45 for large prints. the artist would like to sell twice as many small prints as large prints. the booth the artist is renting costs $510. how many of each size print must the artist sell in order ...
October 28, 2012

4th grade math
You can divide 108 into 324 to find the product of 324 x 4 324/108 = 3 or You can Multiply 3 x 108 = 324 to find the product of 324 x 4
October 19, 2012

LATIN
The new book will belong to the consul
October 11, 2012

LATIN
How do I say "belong to" in Latin?
October 11, 2012

LATIN
Thanks!
October 11, 2012

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