Tuesday

July 22, 2014

July 22, 2014

Number of results: 27,482

**Chemistry**

Calculate the heat released when 1.61 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride.
*October 2, 2010 by Trinh*

**chemistry**

Calculate the heat released when 3.10 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride. 1 kJ
*October 6, 2010 by mylles*

**chemistry**

Calculate the heat released when 3.10 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride
*October 6, 2010 by Tits magee*

**CHEM HELP PLEASE**

1- the vinegar soltion sold in the store is about 5% acetic acid. Assuming that the solution has a density of 1.01 g/mL, calculate the pH of vinegar.
*May 20, 2013 by JOJO*

**chem**

Given that the density of the supplied vinegar solution in this experiment is 1.025 g/mL, calculate the % acetic acid found in the vinegar sample.
*April 15, 2014 by john*

**Math in Science**

A student measures the volume of a liquid and finds it to be 40mL. How many significant figures are in the measurement? 1 *** 2 3 4 Calculate the area, with the appropriate number of significant figures, of a rectangular room that is 14.10 m wide by 15.0 m long. 212 m^2*** 211...
*September 17, 2013 by Gabby*

**math**

a triangle has three internal angles. one angle measures 37 degrees another one measures 67 degrees. how many degrees does the third angle measure? 1) 28 2) 34 3) 76 4) 256 5) not anought information is given
*May 10, 2010 by michael*

**calculus**

8). Part 1 of 2: In the solid the base is a circle x^2+y^2=16 and the cross-section perpendicular to the y-axis is a square. Set up a definite integral expressing the volume of the solid. Answer choices: integral from -4 to 4 of 4(16-y^2)dy, integral from -4 to 4 of (16+y^2)dy...
*April 14, 2013 by Sally*

**circles and arcs**

YOU have a circle with a traingle inside. P being the top of triangle and Q and R, are on the sides, PQ= (8x-10) and PR=(6x) and the bottom QR= (10x+10) SAYS: a)find X b)is the triangle equilateral, isosceles, or scalene? explain. We have not done this type of work, this is ...
*May 23, 2012 by lilman*

**Chemistry 1150**

Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s)→NH+4(aq)+NO...
*February 25, 2014 by Smith*

**Math**

A cube with a volume of 216 cm3 is cut down to a pyramid with the same size base and the same height as the original cube. What is the volume of the pyramid? A.108 cm3 B.94 cm3 C.72 cm3 D.52 cm3
*July 5, 2012 by Kaylie*

**8th grade science**

The densities of four different woods are shown below. Wood Sample Densities Type of wood: African Teakwood Density(g/cm3) 0.98 Type of wood: Balsa Density(g/cm3) 0.14 Type of wood: Cedar Density(g/cm3) 0.55 Type of wood: Ironwood Density(g/cm3) 1.23 Which wood will sink when ...
*April 3, 2012 by Lana Grib*

**Using Matlab **

imagine you have a simple calculator that can only do addition,subtraction,multiplication and division. show how you can still use it to calculate the cube root of a given number, ie a^1/3, as follows: a)show that newton raphsons method for solving the equation x^3 -a=0 ...
*October 16, 2011 by geoff *

**Chemistry**

On the basis of the description given classify each of the following solids as molecular, metallic, ionic, or covalent network. Explain why? A. a lustrous, yellow solid that conducts electricity B. a hard, black solid melting at 2350 degrees C to give a nonconducting liquid C...
*February 3, 2008 by Lauren*

**Chemistry**

On the basis of the description given classify each of the following solids as molecular, metallic, ionic, or covalent network. Explain why? A. a lustrous, yellow solid that conducts electricity B. a hard, black solid melting at 2350 degrees C to give a nonconducting liquid C...
*February 4, 2008 by Lauren*

**chemistry**

water has a density of 1g/cm3 ; if 2 different pieces of the wood are put into water which will float and which will sink ? Wood 'a' has a density of 1.19g cm3 Wood "b" has a density of .67 g/cm3 Explain your answer?
*August 19, 2012 by maria*

**chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*February 1, 2012 by victoria*

**Chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*September 3, 2013 by Elizabeth*

**Chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*September 3, 2013 by Elizabeth*

**chem **

If I added 60 drops of water to a beaker and weighed it, and then added another 60 drops of water to the breaker; How would I calculate number of drops per gram. How do I use density to calculate the number of drops per mL?
*October 7, 2009 by lou*

**math**

what is the density of the block? density is 2700 volume is 10^-4
*November 15, 2009 by Annie*

**chemistry**

Water (density = 1.00 g/mL) will float on hexane (density = 0.95 mL).
*April 3, 2011 by Anonymous*

**chemistry**

i just have a question about le chatelier's principle lets say you have: A(g) + B(s) --> C(g) + D(g) does adding more of B which is a solid shift it to the right? or will it have no effect because it is a solid? thanks
*April 19, 2009 by brad*

**math**

Using the numbers 5, 8, and 24, create a problem using no more than four operations (addition, subtraction, multiplication, division, square, square root, cube, cube root) where the solution will be an irrational number. Explain why the result of your operations is an ...
*November 7, 2012 by someone unknown*

**maths**

A circular pool has a diameter of 3m and is filled to a depth of 70 cm. Mr Thorpe climbs into the pool and submerges for ten seconds while his son measures the new depth at 72 cm. Calculate Mr Thorpe’s volume
*September 1, 2011 by ayesha*

**math**

A circular pool has a diameter of 3m and is filled to a depth of 70 cm. Mr Thorpe climbs into the pool and submerges for ten seconds while his son measures the new depth at 72 cm. Calculate Mr Thorpe’s volume
*April 3, 2012 by jim*

**Science**

Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the density by ...
*November 22, 2013 by Billy Jean Not Mah Lover*

**Science**

Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the density by ...
*March 6, 2014 by Steve*

**Algebra-Please check my work**

Posted by JoniAnne on Wednesday, October 20, 2010 at 11:50am. Please check- Solve 3 > sqrt(3x) 3x >=o x>=o/3 x>=0 square both sides and you have 3x < 3^2 3x,9 x<9/3 x<3 answer is 0<=x<3 correct or not? 3(cube) sqrt(2-5) = 3 cube both sides = 2-5x = ...
*October 20, 2010 by JoniAnne*

**Algebra-Please check-I'm desperate**

Posted by JoniAnne on Wednesday, October 20, 2010 at 11:50am. Please check- Solve 3 > sqrt(3x) 3x >=o x>=0/3 x>=0 square both sides and you have 3x < 3^2 3x,9 x<9/3 x<3 answer is 0<=x<3 correct or not? 3(cube) sqrt(2-5) = 3 cube both sides = 2-5x = ...
*October 20, 2010 by JoniAnne*

**Math**

Q.250 cm3(cube) of the liquid weighs 125 grams. find the weight of 1000 cm3(cube) of the liquid. Q.The cost of a long distance call lasting 20 seconds was 23.40 at this rate what was the cost of a call lasting 6 minutes 30 seconds.
*May 15, 2011 by Bella stoner*

**Chemistry**

I am not really sure how to do this: Calculate the pH when 1.0*10^-3 moles of solid NaOH is added to a) One liter of 9.1*10^ -6 M HCL b) One liter of a solution containig 0.05 M CH3COOH and 0.1 M CH3CooNa
*August 11, 2009 by Saira*

**Science**

Calculate the amount of heat required to completely sublime 63.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 C.
*March 12, 2011 by Katie*

**Science**

Calculate the amount of heat required to completely sublime 63.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 C.
*March 12, 2011 by Katie*

**Chemistry**

Calculate the change in pH if 0.050 g of solid NaOH is added to 250 mL of a buffer solution that contains 0.80 M NaH2PO4 and 0.17M Na2HPO4. I found the pH of the buffer solution to be 6.54.
*April 4, 2013 by Matt*

**chemistry**

We want to make 100. mL of 1.0 M NaA solution by dissolving solid NaA in water. What mass of solid NaA is needed?
*April 12, 2010 by bob*

**math**

2. the volume of a rectangular solid is 5376 cubic meters, and the base is 24 meters by 16 meters. find the height of the solid.
*January 8, 2012 by Randy*

**Chemistry Stoichiometry**

1. Tin and oxygen gas are reacted together to form Tin (IV) oxide, a solid. If a piece of tin foil, 8.25cm x 21.5cm x 0.60mm (density = 7.28g/cm3) is exposed to oxygen and all the tin reacts, what is the mass of the oxidized tin foil? (98.4g) I am so confused on this problem ...
*May 29, 2009 by Gweedo8*

**9th grade**

A student put 12.4 grams of potassium sulfate in 29 ml and stirred for 3 hrs. he saw that not all of the solid dissolved, so he removed the extra solid and found it had a mass of 3.4 grams. what was the solubility of the chemical?
*February 21, 2010 by Anonymous*

**Chemistry**

Can you show me the process that you need to take to balance this basic redox reaction using the ion electron method? Tl2O3(solid) + NH2OH(liquid) --> TlOH(solid) + N2(gas) + H2O(liquid)
*September 12, 2011 by Kim*

**Chemistry**

Ag2S is an insoluable black solid. Would more solid dissolve, or precipitate once the following are added to the solution. 1. KS-----I know [S] increases, shift to reactants side, precipitate 2. HClO 3. LiOH 4. NH4OH
*June 20, 2012 by Jake*

**Chemistry :(**

Calculate the molality, % percent composition by weight, and the mole fraction of HCl in an aqueous 12M HCl solution that has a density of 1.20 g?mL Please help :(
*January 22, 2013 by Jillian*

**chemistry**

calculate the freezing point and osmotic pressure at 25 degrees celcious of an aqueous solution containing 1.0 g/L of a protein (mm=9.0*10^4g/mol) if the density of the solution is 1.0 g/cm^3
*February 8, 2010 by heather*

**physics**

a 20.0 kg child on an 80 kg boat throws a 5 kg package horizontally with a speed of 10 m/s. Calculate the resulting density of the boat, assuming it was initially set at rest.
*January 31, 2011 by willy n*

**Chemistry**

Calculate the heat change (q) in kJ for each reaction. Assume the density of the acid solutions is 1.00 g/mL and the heat capacity is 4.184 J/g*°C. i have the Ti and Tf..what equation do i use?
*May 25, 2011 by ChemGeek*

**match**

A certain land area is 340,000 square miles, and it holds a population of 63.1 million people.Calculate the population density.
*February 16, 2012 by Liz*

**Chemistry**

Household vinegar is acqueous 5.00%,acetic acid solution(by mass),if its density is 1,01 g/ml.calculate the mole fraction!molarity,and molality of the solution.
*April 11, 2012 by Marcia*

**Physics**

Small spheres of diameter 1.00mm fall through 20 degree Celsius water at a terminal speed of 1.10 cm/s. calculate the density of the spheres.
*January 31, 2013 by Emma*

**Physics**

The flux density through a 200 turn coil of area 8.5*10^-4 m squared changes from 0.03 T to 0.12 T in 15 mins. Calculate the induced emf in the coil.
*May 27, 2014 by Terry*

**Chemistry**

An 8.00 mass % aqueous solution of ammonia has a density of 0.9651g/ml. Calculate the molality, molarity, and mole fraction of NH3. This question seems simple but I cannot seem to remember how to do this. Help please?
*December 14, 2011 by ALISON*

**chemistry**

Calculate the PH concentrated hydrochloric acid if this solution is 24.8% HCL by weight and has a density of 1.16g/ml. I do not understand the right answer 0.90PH Why? Please help My calculation 1.18g/ml x 1000ml x 0.248/36.5 = 7.8M I cannot do?
*July 29, 2012 by Fai*

**chemistry**

CaCO3 = CaO +CO2 after a 15.8g sample of calcium carbonate was heated in an open container to cause decompostition the mass of the remaining solid was determined to be 9.10g. calculate the mass of carbon dioxide produced.
*September 14, 2010 by Missy*

**Geometry**

If the measures of the exterior angles of the acute angles of a right triangle are (6x+23) and (4x+17), find the measures of the acute angles.
*October 5, 2011 by Rosa*

**Physics**

At a certain location, the Earth's magnetic field has a magnitude of 5.90E-5 T and points in a direction that is 71.6° below the horizontal. Calculate the magnitude of the magnetic flux through the top of a desk at this location that measures 132 cm by 83.3 cm.
*October 18, 2010 by VJC*

**INTRO TO PHYSICS**

Each of the following objects has a radius of 0.174 m and a mass of 2.16 kg, and each rotates about an axis through its center (as in the table below) with an angular speed of 37.3 rad/s. Find the magnitude of the angular momentum of each object. >Hoop of thin cylindrical ...
*October 31, 2012 by Sandy*

**physics**

12. The ratio of the tensile (or compressive) strength to the density of a material is a measure of how strong the material is “pound for pound.” (a) Compare tendon (tensile strength 80.0 MPa, density 1100 kg/m3) with steel (tensile strength 0.50 GPa, density 7700 kg/m3): ...
*November 26, 2012 by mary*

**chemistry**

Calculate the amount of heat required to completely sublime 24.0 g of solid dry ice CO_2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.
*September 7, 2008 by Erin*

**Chemistry**

Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.
*April 16, 2013 by Jamie*

**Chemistry**

Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.
*April 16, 2013 by Jamie*

**chemistry**

Calculate the amount of heat required to completely sublime 76.0g of solid dry ice (CO2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.
*September 1, 2013 by cj*

**Analytical Chemistry**

I need to prepare a standard iron solution by dissolving an appropriate mass of solid Fe(NH4)2(SO4)2*6H2O in water in a 1L volumetric flask containing 1 ml of 96 wt% H2SO4. The final concentration should be ~40mg/L. How would I calculate the this?
*April 19, 2011 by Ryan*

**Physics**

A block of wood, with density 828 kg/m3 , has a cubic shape with sides 0.340 m long. A rope of negligible mass is used to tie a piece of lead to the bottom of the wood. The lead pulls the wood into the water until it is just completely covered with water. What is the mass of ...
*April 10, 2012 by Akbar*

**Physics**

A block of wood, with density 828 kg/m3 , has a cubic shape with sides 0.340 m long. A rope of negligible mass is used to tie a piece of lead to the bottom of the wood. The lead pulls the wood into the water until it is just completely covered with water. What is the mass of ...
*April 10, 2012 by Akbar*

**Chemistry**

A 0.355 g sample of a solid, monoprotic acid having a molar mass of 121 g/mol requires 18.47 mL NaOH for neutralization. Calculate the molarity of the NaOH solution. I got 0.159 M NaOH
*July 11, 2013 by <3*

**Density**

A new penny has a mass of 2.54 g and a volume of 0.354 cm3. Is the penny made of pure copper? what is its density? thanks:) Density is mass/volume but I dont know how to find it with g and cm3
*August 26, 2010 by Maria*

**Chemistry**

Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When the pack is squeezed, the pouch breaks and the solid dissolves, lowering the temperature because of the following endothermic reaction. NH4NO3(s) + H2O(l) = NH4NO3(aq) ÄH = +25.7...
*February 1, 2011 by Don*

**algebra**

Denis is designing a storage box in the shape of a cube.Each side of the box has a length of 10 inches. she needs more room anddecides to constructa largerbox in the shape of a cube with a volume of 2,000 cubic inches. By how many inches to the nearest tenth should she increse...
*February 3, 2010 by anum*

**chemistry**

Solid silicon and solid magnesium chloride forms when silison tetrachloride gas reacts with magnesium metal. Write a word equations and an ublanced formula equation. Include all of the appropriate notations.
*February 4, 2009 by kate*

**chemistry**

Solid silicon and solid magnesium chloride forms when silison tetrachloride gas reacts with magnesium metal. Write a word equations and an ublanced formula equation. Include all of the appropriate notations.
*February 4, 2009 by kate*

**Maths**

Please Could someone tell me what: 1. A square number is 2. A cube number is 3. A triangle number is Thank you Square numbers are the result of squaring an integer (IxI) Cube numbers are the result of the cube of an integer (IxIxI) A triangular number is a number such that the...
*April 23, 2007 by sean*

**physics**

A lobsterman's buoy is a solid wooden cylinder of radius r and mass M. It is weighted on one end so that it floats upright in calm sea water, having density . A passing shark tugs on the slack rope mooring the buoy to a lobster trap, pulling the buoy downward a distance x from...
*November 30, 2009 by Keith*

**math**

Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. The two most frequently used measures of central tendency are the mean and median. Compare these two measures for the following characteristics: Take every ...
*September 3, 2010 by C*

**Maths**

A)Sam jogs 6 laps around a circular running track which has a radius of 30 meters. How far does she jog in total? B)Tom and Jerry decide to find the perimeter of their garden. Tom measures the length as 5.2meters while Jerry measures the width as 37cm. ehat is the perimeter?
*February 24, 2011 by Anonymous*

**General Chemistry**

When silver crystallizes, it forms facecentered cubic cells. The unit cell edge length is 409 pm. Calculate the density of silver.
*February 16, 2010 by WisKeyKey*

**chemistry**

using the balanced equation for the fermentation reaction, calculate for the theoretical amount of alcohol to be produced using 10 grams of sucrose. 0.79 g/ml is ethanol's density.
*January 6, 2011 by mae*

**Chemistry**

a solution of 4.65 of a carbohydrate in 100.0g of water has a density of 1.016g/mL and an osmotic pressure of 3.18 atm at 20.0 degrees celcius. calculate the molar mass of the carbohydrate.
*February 15, 2011 by Amy*

**Chemistry**

If the molar volume of an ideal gas is 22.4 L/mol, calculate the theoretical density of hydrogen gas at STP. Not sure what formula to use with this question. Thanks.
*April 27, 2011 by Thao*

**chemistry**

What volume of ammonia at 7.0 atm and 235C would you get from 333g of nitrogen reactin with enough mass of hydrogen?k calculate the density of hydrogen at STP?
*November 18, 2011 by NONO*

**Chemistry**

A radiator is to be protected against freezing to -20f. Calculate the volume of C2H4(OH)2 ethylene glycol per liter of water. Density of glycol is 1.11 g/ml
*July 23, 2012 by Daisy *

**physics**

A flexible metal sheet of length 6.0cm, breadth 5.00cm and the average thickness of 0.883cm has a mass of 23.00g. calculate the density of the metal
*October 18, 2012 by betty*

**Chemistry**

Average density of a copper-coated iron BB is 8.00g/mL. If the density for copper is 8.92 g/mL, and the density for iron is 7.43g/mL, what is the percentages of copper and iron in a BB?
*September 11, 2008 by Heather*

**chem**

Forty miles above the earth's surface the temperature is 250 K and the pressure is only 0.20 mm Hg. What is the density of air (in grams per liter) at this altitude? (Assume the molar mass of air is 28.96 g/mol.) PV=nRT n/V= molar desity= P/RT mass density= molar density*...
*March 30, 2007 by Helpme*

**science help please?????????????**

A student wishes to test the accuracy of the measuring jug she is using in an experiment. The label on the jug claims that it measures volume to an accuracy of plus or minus 5 cm3. The density of water is about 0.999 g cm−3, which means that 100 cm3 of water should have ...
*December 6, 2013 by centya*

**Science need help???**

A student wishes to test the accuracy of the measuring jug she is using in an experiment. The label on the jug claims that it measures volume to an accuracy of plus or minus 5 cm3. The density of water is about 0.999 g cm−3, which means that 100 cm3 of water should have ...
*December 7, 2013 by centya*

**STATISTICS HELP**

A student wishes to test the accuracy of the measuring jug she is using in an experiment. The label on the jug claims that it measures volume to an accuracy of plus or minus 5 cm3. The density of water is about 0.999 g cm−3, which means that 100 cm3 of water should have ...
*December 9, 2013 by john*

**Trig**

Solve ABC if C=90 degrees, B=20 degrees, and b=10. Round measures of side to the nearest tenth and measures of angles to the nearest degree. So all I need to do for this problem is find A,a,c right? I know that A=70 b/c 90+20=110 and 180-110=70 but how do I find a,c?
*March 6, 2008 by Jon*

**Geometry**

You are wallpapering two walls of a room. One wall measures 15 ft by 12 ft and the other measures 9 ft by 12 ft. The wall paper costs $19.40 per roll, and each roll covers 50 square feet. What does it cost to cover the two walls?
*December 1, 2010 by Myung*

**Geometry**

You are wallpapering two walls of a room. One wall measures 15 ft by 12 ft and the other measures 9 ft by 12 ft. The wall paper costs $19.40 per roll, and each roll covers 50 square feet. What does it cost to cover the two walls?
*December 1, 2010 by Myung*

**chemistry**

I have a unit cube question to which the answer is given that I'm trying to figure out. The question is: If under conditions of high pressure & temperature, the crystalline structure rearranges to form a face-centered cubic unit cell, what is the new density of the substance? ...
*July 10, 2011 by unit cubes*

**Physics Please help**

A block of wood, with density 828 kg/m3 , has a cubic shape with sides 0.340 m long. A rope of negligible mass is used to tie a piece of lead to the bottom of the wood. The lead pulls the wood into the water until it is just completely covered with water. What is the mass of ...
*April 10, 2012 by Akbar*

**physics--pressure**

how high would the atmosphere extend if it were of uniform density throughout, equal to half the present density at sea level?
*March 22, 2009 by lisa*

**chemistry**

one mole of a gas occupies 27.0 liters, and its density is 1.41g/l at a particular temperature and pressure. what is its molecular weight? What is the density at STP?
*June 28, 2009 by Bobby*

**physics**

a ball of mass of 4kg,of density 4000kg/m3 is completely immersed in water of density 1000kg/m3.find the force of buoyancy.[g=10m/s2]
*October 23, 2012 by keerthiga*

**geometry**

the sum of the measures of an obtuse angle and acute angle is 12 degrees.the complement of the acute angle and one-half the suplement of the obtuse angle is 75 degree.find the measures of the two angles.
*July 14, 2012 by cj*

**Geometry**

ABCD is a square. If one side of the square measures 2x – 5 inches and the other side measures x + 8 inches, find x.
*July 12, 2013 by Anonymous*

**Factoring Polynomials**

Ok, this is pretty long, so bear with me. The problem says: The diagram (not shown here, sorry) shows a cube of metal with a cylinder cut out of it. The formula for the volume of a cylinder is V=pi*r^2*h, where r is the radius and h is the height. The cube's length, width, and...
*January 10, 2007 by Emily*

**Physics**

In the rough approximation that the density of the Earth is uniform throughout its interior, the gravitational field strength (force per unit mass) inside the Earth at a distance r from the center is gr/R, where R is the radius of the Earth. (In actual fact, the outer layers ...
*April 5, 2011 by Mehreen*

**Chem- Dr bob! or GK!**

Calculate the energy that must be removed to convert substance X from a gas at 116°C to a solid -44.6°C. Assume X has a molar mass of 75.0 g/mol. ÄHvap 20. kJ/mol C(s) 3.0 J/g·°C ÄHfus 5.0 kJ/mol C(l) 2.5 J/g·°C bp 75°C C(g) 1.0 J/g·°C mp -15°C please help! what formulas do i ...
*November 29, 2008 by Rachelle*

**Statics**

A solid, round simply supported steel shaft has a diameter of 25mm and span length of 500mm. The shaft supports a concentrated load of 3kN at midspan. Calculate the maximum deflection of the shaft.
*April 23, 2012 by Mary*

**Chemistry**

If 430 mL of 0.837 M aqueous HNO3 and 23.5 g of solid Al are reacted stoichiometrically according to the balanced equation, how many grams of solid Al remain? Round your answer to 3 significant figures. 6HNO3(aq) + 2Al(s) → 3H2(g) + 2Al(NO3)3(aq)
*February 26, 2010 by Sammy*

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