Thursday

December 8, 2016
Number of results: 59,658

**chemistry**

given the density of helium is 0.1785g/cm3 and the density of argon is 1.784g/cm.3 estimate the density of neon

*October 28, 2012 by Jessa*

**Chemistry**

If the column of water in the water barometer fore to a height of 35ft, what would the atmospheric pressure be in mm Hg? mmH20X(density of water/density of Hg)= mmHg Density of water=0.99707 Density Hg=13.5340

*February 11, 2011 by Brian*

**Chemistry**

The mass of the earth is known to be about 5.98 X10^24kg assume that it is approx. spherical with an average diameter of 1.276X10^7 METERS. from these data calculate the average density of the earth(g/cm^3) could the earth be made mostly of water (density=1.00g/cm^3), abundant...

*August 30, 2011 by ALISON*

**Chemistry**

Please help!! If the density of fresh water at 4 degrees Celsius is 1.00g/mL, determine if the following objects will sink or float in water. 1.) A 200 feet (61m) tall pine tree that weighs 11,200 pounds (5,080 kg) and has a density of 0.88g/mL 2.) One gram of lead that has a ...

*February 12, 2015 by Tasha*

**Chemistry**

a) The element with the greatest density is osmium, which has a density of 22.6g/cm3. calculate the mass of 32.1 cm3 of osmium. Answer: 22.6g x 32.1 = 725.46 Did I have right answer? b) A team of students determined the density of a sample of wood to be 0.52g/cm3. A handbook ...

*April 2, 2010 by Anonymous*

**Chemistry**

The population of San Francisco is 750,000 in an area of 49 square miles. What is the population density in San Francisco? Express your answer in people per acre. ( 1mi(squared) = 640 acres ) 49 sq mi x (640 acres/1 sq mi) =?? acres. (Note that sq mi cancels leaving acres.) ...

*September 13, 2006 by Jamie*

**Chemistry 101 **

A chemist needs 2.00 grams of a liquid compound with a density of 0.785 g/cm^3 density. what volume of compund is required? Mass= Volume X Density 2.00g x 0.785 g/Cm^3 = 1.57g/cm^3 Not sure is this is correct......

*January 27, 2016 by Lilly*

**Dobson**

a)The element with the greatest density is osmium, which has a density of 22.6g/cm3. Calculate the mass of 32.1 cm3 of osmium. b)A team of students determined the density of a sample of wood to be 0.52 g/cm3. A handbook of chemistry reported the density of 0.548 g/cm3 for the ...

*March 26, 2010 by Anonymous*

**chemistry**

silver has density of 10.5 g/cm3 and gold has a density of 193.g/cm3 which liquid is denser silver and gold are liquids? That's news to me. You're given the ratios for density, which ratio is greater 10.5gm/cm^3 or 193gm/cm^3? It appears gold is over 18 times as dense as ...

*September 10, 2006 by delonte*

**chemistry - density and error (check)**

Calculate the density of earth and the density error. i got the answer 5.57*10^3k +/- 9.60 *10^7kg/m is that the correct answer? please help

*January 24, 2011 by Farah*

**Chemistry**

Can you convert density to moles? I am given the density of a substance [0.789 g/mL] but I need to know the number of moles for the equation. You cannot convert density to moles, unless you also know the volume and the molecular formula. (density) * Volume = mass = (# of moles...

*December 28, 2006 by Alexandria*

**Mechnical principles**

Mtal block weighs 500g in air and 446g completely submerged in water. Calculate density and relative density. I know relative density is density of material/density of water (1000kg/m-3)

*April 9, 2015 by Danny*

**Math/Chemistry**

The density of water i 1.00 g/cm^3. Express this density in lb/ft^3. (1 lb = 454 grams)

*September 22, 2008 by Claire*

**chemistry**

Suppose a gas sample has a density of 3.68 g/L at STP. What is its density at 25 oC and 19.0 atm?

*December 9, 2014 by adrian *

**chemistry**

Answers for copper has a density of 8.92g/cm3 and nickel has a density of 8.90 . which one is denser

*November 4, 2010 by Anonymous*

**Science (Chemistry)**

The Average density of Earth is 5.52g/cm^3. What is its density in a. kg/m^3 b. lb/ft^3. Please help me set up these equations. Thank you!

*June 13, 2011 by Grace*

**chemistry**

nonane has a density of 0.79 g/mL and boils at 151 celsius. will it float or sink in water (density of 1.00 g/mL)

*July 27, 2011 by melissa*

**chemistry**

7. Calculate the density of hydrogen sulfide, H2S, at 56 ºC and 967 mmHg. (Express density in g/L)

*March 26, 2015 by nona*

**chemistry**

Convert a density of 2.74 x 103 g/L into a density with dimensions of kg/mL. please show how would this conversion be done.??

*September 6, 2010 by Jack*

**science (density)**

1) mass=100g, volume=10ml,density= 2) volume=7ml, mass=70g, density= 3) mass=50g, volume=10cm3, density= 4) volume=30cm3,mas=90g,density= 5) mass=120,volume=6ml,density= Thanks everyone i apresheate your help.

*October 9, 2008 by Carly*

**science (density)**

1) mass=100g, volume=10ml,density= 2) volume=7ml, mass=70g, density= 3) mass=50g, volume=10cm3, density= 4) volume=30cm3,mas=90g,density= 5) mass=120,volume=6ml,density= Thanks everyone i apresheate your help.

*October 9, 2008 by Carly*

**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*

**Chemistry 101 **

A chemist needs 2.00 grams of a liquid compound with a density of 0.785 g/cm^3 density. what volume of compund is required?

*January 27, 2016 by Lilly*

**chemistry**

Water (density = 1.00 g/mL) will float on hexane (density = 0.95 mL).

*April 3, 2011 by Anonymous*

**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*

**Chemistry**

How can you solve for a derived unit involving density? I don't know what you mean. Density is a derived unit, no mater what the units used are. Do you have an example of what you are doing? Yes. What is the mass of a sample of material that has a volume of 55.1 cm^3 and a ...

*January 18, 2007 by Whitney*

**Chemistry**

the current U.S. penny is only 2.5% copper the remaining portion is zinc. Given the density of copper as 8.94 g/cm and the density of zinc is 6.57 g/cm, calculate the density of a penny.

*September 11, 2014 by Devante*

**Chemistry**

Calculate the density (g/L) of 478 mL of krypton at 47 degrees C and 671 mmHg. I wasn't sure about this one but I got: density = 2820 g/L with sig figs

*November 13, 2015 by Anonymous*

**Chemistry**

When a 1.1 gram ice cube is placed into a 10.0 mL graduated cylinder, the level of water inside the graduated cylinder raises 1.20 mL. What is the Density of the ice cube? My Work: Density = 1.1g/10.0 mL + 1.20 mL? my answer came out to be; Density= .0982 g/mL

*September 3, 2014 by Alex*

**chemistry**

Making the simplistic assumption that the dissolved NaCl(s) does not affect the volume of the solvent water, determine the constants m and b in the equation Molarity = m⋅density + b that relates the NaCl molarity to the NaCl(aq) density. Take the density of water to be 1...

*May 28, 2013 by Anonymous*

**chemistry **

If the atmosphere can support a column of mercury 760 mm high at sea level, what hright of a hypothetical liquid whose density is 1.40 times the density of mercy could be supported?

*June 20, 2012 by Dallas *

**college chemistry**

A certain metal crystallizes in a face-centered cubic arrangement and has a density of a density and atomic radius of 12.41 g/cm3 and 134.5 pm, respectively. Which element below is it?

*February 23, 2014 by hershi*

**Chemistry **

Mary was determining the density of a metal cylinder. When recording the diameter, she mistakenly recorded a number that was too small. Will her calculated value for density be too high or too low? Explain

*September 30, 2015 by Anonymous*

**chemistry**

calculate the density of NO3 gas at 0.970mm Hg and 35C Take 1 liter. calculate n in PV=nRT then, density= mass/volume= (n*molmassNO3)/1liter. I STILL DON'T UNDERSTAND HOW TO DO IT COULD U PLEASE EXPLAIN What don't you understand about PV = nRT and how that fits your problem. ...

*January 9, 2007 by TIFFANY*

**chemistry**

Gallium Arsenide ---------------- The charge carrier density of GaAs at 31o C is 2.25x106 cm-3. What is the charge carrier density (in cm-3) at 175oC? (The bandgap of GaAs is 1.42 eV. ) I am trying with arrhenius relationship but get confused over "charge carrier density"

*August 25, 2014 by WIlliam*

**Chemistry**

Density of a metal cube of dimension 10 inches X 10 inches x 10 inches is 8.05g/cm3. What is its mass? 10inches? isnt that 25 cm? So get the volume in cm^3 by multiplying the three dimensions in cm. Multipy that volume by density. Mass= density*volume

*June 10, 2007 by Brooke*

**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*

**Ecology**

What are the types of population density measure and how each may be determined? Airkon Population density is a measurement of the number of people in an area. It is an average number. Population density is calculated by dividing the number of people by area. Population ...

*October 8, 2006 by airkon*

**Math**

The density of water at 21 degrees C is 0.997992 g/mL. The density of water at 22 degrees C is 0.997770 g/mL. What is the density of water if the room temperature is 21.3 degrees C?? So I would just multiply 30 percent of the density at 21 degrees C but I'm stuck on how to ...

*October 18, 2016 by Ray*

**Chemistry;HELP**

Use the 5-step method and be sure to include units where appropriate. Round your answers to the correct number of significant digits. Mass m Density = -------------- or D = ------- Volume v Adjust the density formula and solve the problems below: m D = ------- Original ...

*January 16, 2013 by Victoria*

**Science- Density**

I'm having difficulty understanding density. I am trying to relate the concept of density to brownies. Should a brownie with baking soda have a higher or lower density compared to a brownie with no baking soda? Does a thick brownie mean a high or low density? When it says high...

*April 24, 2016 by Jessica*

**chemistry **

In a chemistry experiment, a student measures the density of iridium (Ir) metal as 21.52 g/cm3. The actual density of Ir metal is 22.65 g/cm3. What is the percent error of the student's measurement?

*October 6, 2015 by SAM*

**chemistry **

how do i calculate a weight/vol % from a molarity given the density? Molarity is 0.0303 M density = 1.52 g/mL, molar mass is 41.99 g/mol.

*April 24, 2016 by Anonymous*

**chemisrty**

can anybody give me the density of arsenic oxide at STP is this the correct formula volume = mass/ density thanks Yes, but if you want the density, it is density = mass/volume. The number I have seen floating around on this board is 17.8 g/L but the density of a gas and the ...

*February 4, 2007 by bex*

**chemistry**

Density of phosgene gas, COCl2(MM=99) ander a certain condition is 4.5g/L. What is the density if H2S gas(MM=34) under the same conditions?

*October 20, 2008 by annemarie*

**chemistry**

Using the idea of atoms write a desciption of the difference between an element with a low density and an element with a hight density ???

*August 23, 2012 by Maria*

**Science, Chemistry**

2) Find the temperature at which air posses a density equal to that of hydrogen at 0°C. Density of air at STP is 14.4. Ans: 3658.2 °C.

*January 19, 2015 by Rajat*

**Chemistry**

Why did you need to know the density of the bleach solution? Why didn't you measure the density of h2o2 solution as well? Stoichiometry lab problem

*October 28, 2012 by HELP PLEASE*

**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*

**Chemistry**

The density of a gas containing chlorine and oxygen has a density of 2.875 g/L at 754.5 mm Hg and 11(degress C). What is the most likely molecular formula of the gas?

*March 28, 2011 by Toni Jones*

**Chemistry**

8. A chemist vaporized a liquid compound and determined its density. If the density of the vapor at 90 ºC and 753 mmHg is 1.585 g/L, what is the molecular weight of the compound?

*March 26, 2015 by nona*

**Chemistry**

if 12.8g of NaCl is added to 243.2 mL of water (density (1.00g/mL)). the volume occupied by the solution is 250.0 mL. Calculate the density of the salt water.

*August 28, 2016 by Anonymous*

**Chemistry **

Substance A has a density of 4.0 g/mL and substance B has a density of 2.0 g/mL. If we have equal-mass samples of each, which has the greatest volume?

*January 23, 2011 by Anna*

**Chemistry **

Substance A has a density of 4.0 g/mL and substance B has a density of 2.0 g/mL. If we have equal-mass samples of each, which has the greatest volume?

*January 23, 2011 by Anna*

**Chemistry**

If the density of a substance is 15.2 g/mL, what is the density in cg/kl?

*December 31, 2011 by Ben*

**Chemistry II**

what is the molar mass of a gaseous organic compound with a density of 3.38 g/L at 40oC and a pressure of 1.97 atm? Ok, I am little confused because I am not sure of where to plug in the density and the atm?

*September 2, 2009 by Michelle*

**Chemistry HELP! IMLOST**

The density of a gas containing chlorine and oxygen has a density of 2.875 g/L at 754.5 mm Hg and 11(degress C). What is the most likely molecular formula of the gas?

*March 28, 2011 by Toni Jones*

**chemistry**

Find the volume in liters. 6.5kg of a substance with a density of 7.96g/mL Im confused about how it would come out in liters.. if the mass is in kg and the density is in g/mL

*March 5, 2011 by tammie*

**Chemistry 9**

a) A 2.56 balloon contains 3.66 g of gas. Find the density b) A 45.3 g sample placed in a graduated cylinder causes the water level to rise from 25.0 mL to 41.8 mL . Find the density

*October 22, 2012 by Seastone *

**chemistry**

20mL ethanol(density=o.789g/mol) is dissolved in sufficient water to produce a 200mL solution. the density of the solution is 0.982g/mL. what is the molarity?

*March 11, 2013 by mj*

**Chemistry **

A rectangular solid of unknown density is 6cm long, 3cm high, and 7cm wide. The mass of this solid is 250g. Calculate the density.

*September 11, 2016 by Shay*

**Chemistry;HELP**

Use the 5-step method and be sure to include units where appropriate. Round your answers to the correct number of significant digits. Mass m Density = -------------- or D = ------ Volume v Adjust the density formula and solve the problems below: m D = ------- Original Formula...

*January 16, 2013 by Victoria*

**Chemistry**

A bottle that holds 250 grams of water holds only 175 grams of gasoline. What is the density of the gasoline? Take the density of water to be 1.0 g/ml mass = volume x density. Rearrange to find volume = mass/density volume of the bottle = 250/1.00 = ?? Now that you know the ...

*February 15, 2007 by Sarah*

**Chemistry**

length in cm of one side of perfect cube of gold with a density of 18g/cc and mass of 25g? How would i set up this equation? I don't know what length formula I would use, because I know that i am not supposed to just divide the density by the mass, because that would be ...

*September 24, 2011 by Bob*

**Chemistry**

A column of mercury in a barometer is 767.3 mm Hg high. Note, that in order for the pressures to be equal, density and height of a column are inversely proportional, therefore, (den1)(h1)=(den2)(h2). The density of mercury is 13.6 g/mL and the density of water is 1.00g/mL. a) ...

*April 16, 2014 by Carly*

**Chemistry I**

25.0 mL of ethanol (density = 0.789 g/mL) initially at 4.2°C is mixed with 35.7 mL of water (density = 1.0 g/mL) initially at 25.3°C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?

*September 15, 2010 by Robbie *

**college chemistry**

for my lab i used 2.0mL of NaOH solution and it doesnt have a density in (g/mL)... is there still a way to calculate the moles to it? unless there is a density to NaOH

*March 19, 2013 by Anonymous*

**chemistry**

If 51.6 mL of ethanol (density = 0.789 g/mL) initially at 6.4°C is mixed with 48.9 mL of water (density = 1.0 g/mL) initially at 29.1°C in an insulated beaker, and assuming that no heat is lost, what is the final temperature of the mixture?

*October 15, 2013 by MK*

**chemistry**

25.0 mL of ethanol (density = 0.789 g/mL) initially at 5.5°C is mixed with 32.3 mL of water (density = 1.0 g/mL) initially at 25.3°C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?

*September 19, 2014 by Anonymous*

**chemistry**

What is the density of a piece of zinc that has a volume of 8000 cubic cm? density= mass/ volume

*September 21, 2014 by joe*

**H. CHemistry**

if the atmosphere can support a column of mercury 760 mm high at sea level, what height of a hypothetical liquid whose density is 1.40 times the density of mercury could supported?

*January 30, 2013 by Jenna*

**General Chemistry**

If the pressure is 748 mmHg, and if h= 35mm, what is the pressure of the gas, expressed in atm, If the substance in the tube is oil having a density of 0.788 g/mL? The density of mercury is 13.6 g/mL.

*October 26, 2014 by Sim*

**Physics**

Is this correct?? Metal block weighs 500g in air and 446g completely submerged in water. Calculate density and relative density. Density of water = 1000kg/m3 BF (Buoyant force) will be 500g-446g = 0.54 g (or 0.054 kg). For volume: If BF = Density(water)*V*g then V = BF/density...

*April 10, 2015 by Danny*

**Chemistry**

Hello everybody, I'm having difficulty understanding the rationalization behind the strengths of Bronstend Lowry acids and bases and my textbook isn't too helpful. Can someone please expalin to me: (1) What exactly is effective negative charge density? (2) how does ...

*July 16, 2007 by John Peterson*

**chemistry**

What mass of sucrose should be combined with 491 g of water to make a solution with an osmotic pressure of 8.70 atm at 270 K? (Assume the density of the solution to be equal to the density of the solvent.)

*August 5, 2010 by ashley*

**chemistry**

A closed-tube manometer is filled with a nmineal oil whose density is 0.857 g/cm^3. What is the pressure in mm Hg if you measure a height of the mineal oil equal to 79.3 mm? The density of mercury is given as 13.586 g/cm^3.

*November 13, 2011 by samn*

**Chemistry**

I have this problem.... Hexane has a density of 0.659 g/ml. How many milliliters (mL) would a student need to pour in order to get 49.5 g of hexane? Am I to solve by using mass = density x volume? And if so, is the answer 32.62mL?

*September 16, 2012 by Amanda*

**chemistry**

If you wanted to make a barometer that had a column of liquid about 6 feet tall, what would the density of the liquid have to be? 1 meter = 3.28 ft 1 inch = 2.54 cm Density Hg = 13.6 g/mL 1atm = 760 torr

*October 12, 2014 by jhon*

**Chemistry**

What mass of sucrose (C12H22O11) should be combined with 477g of water to make a solution with an osmotic pressure of 8.15atm at 275K ? (Assume the density of the solution to be equal to the density of the solvent.)

*February 8, 2015 by chemstud*

**Chemistry**

At 20 degrees C ethanol has a density of 0.789 g/ml and H2O has a density of 1.0 g/ml. What is the % by volume of ethanol of a solution made by adding 50g of ethanol with 50g of H2O? Tutor Answer: Use density = mass x volume to convert 50 g ethanol to volume and to convert 50....

*November 29, 2011 by Shelly*

**science**

The density of a liquid is 750 kg/m³. what will be its relative density? (Density of water at 4°C is 1000 kg/m³.)

*October 15, 2016 by junaid*

**Chemistry**

I'm stuck on this one problem in Chemistry: A student measures the mass of an object as 2.32 grams and its volume as 34.56mL. The student then calculates the density to be 0.067129629. There are two things wrong with the students value for density. What are they? Now when I ...

*September 14, 2007 by Chervonna*

**chemistry**

The organic compound di-n-phthalate is sometimes used as a low-density manometer fluid. Compute the pressure (in torr) of a gas that supports a 517-mm columns di-n-butyl phthalate . The density of mercury is 13.53 g mL-1.

*May 2, 2013 by tonia *

**Chemistry**

If you wanted to make a barometer that had a column of liquid about 6ft tall what would the density of the liquid have to be? 1meter=3.28ft 1in=2.54cm Density Hg=13.6g/ml 1atm=760torr

*October 12, 2014 by Ana*

**Chemistry**

Lithium is a soft, gray; solid that has the lowest density of any metal. If a rectangular slab of lithium weighs 1.49x10^3 mg and has a volume of 2.76 cm^3, what is the density of lithium in g/cm^3? Please and thank you!

*June 25, 2011 by Mary*

**chemistry**

Calculate the molar mass of a gas if 0.805g of this gas has a pressure of 4.00 bars at 305K in a 1 L. What is the gas density at this T and P, and what is the density at STP

*September 11, 2009 by john*

**Density**

Can you identify a metal if you know its density? Explain It depends upon how accurately the density is determined. In some cases, especially where the "unknown" has a density that isn't close to another metal, yes, the density can identify the metal with a high degree of ...

*August 29, 2006 by John*

**Chemistry**

I need help I do not know how to set up this problem. Calculate the energy to heat three cubes gold aluminum and silver from 15 Celsius to 25 degrees Celsius. Density gold:0.129 J/g degrees C Density aluminum: .896 J/g degrees C Density silver: .235 J/g degrees C

*September 23, 2015 by Amber*

**chemistry**

If the density of a substance is 7.87 g/cubic cm, convert this density to g/cubic inches.

*February 13, 2008 by Lindsay*

**Chemistry**

A 1" x 1" 1/8" copper ingot has a density of 8.94 g/mL. 25 pellets were obtained from the ingot. Explain what would be the density of each pellet. I went ahead and found the mass of the ingot which is 1.1175g but I'm still stumped on what to do from there.

*February 1, 2016 by Joe*

**Chemistry**

The organic compound di-n-butyl phthalate, C16H22O4(l), is sometimes used as a low-density (1.046 g·mL–1) manometer fluid. Compute the pressure (in torr) of a gas that supports a 555-mm column of di-n-butyl phthalate. The density of mercury is 13.53 g·mL–1. Note: For a ...

*October 28, 2012 by Garcia*

**chem**

Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles)of He(g) is present in a helium-oxygen mixture having a density of 0.538g/L at 25celsius and 721mmHg ? Responses chemistry - ...

*September 26, 2008 by tomi*

**Science**

What is the mass of 15mL sample of mercury? Look up the density of mercury. mass = volume x density. Make sure the density is in g/mL. If it isn't you will need to convert it. One place to find density of mercury is at www.webelements.com and click on element #80. I don't ...

*November 16, 2006 by Crystal*

**Chemistry**

Sea water contains an average of 270 ppm of sulfate ion. Calculate the molar concentration of sulfate given that the average density of sea water is 1.02 g/ml. -At first i tried assuming that density is 1.00 g/ml which is a common practice in ppm problems but the answer is ...

*June 12, 2013 by xavier*

**CHemistry....Please help**

How would i calculate the density of Li2S in grams per cubic centimeter? I have to use the equation : density= mass/ volume: But i don't know how to find out the volume using the edge length of the unit cell which is 5.88* 10^2 pm.

*January 25, 2009 by Saira*

**chemistry**

At room temperature , the density of water is 1 g/ml and the density of ethanol is 0.789 g/ml . What volume of ethanol contains the same no. of molecules as are present in 175 ml of water?

*June 15, 2015 by Kajal*

**college chemistry**

Calculate the pH of a solution prepared by mixing 150.mL of 0.174 molal aqueous HF (density=1.10g/mL) with 37.5 g of an aqueous solution that is 1.3% NaOH by mass (density=1.02 g/mL)

*March 24, 2011 by does anyone get this???*

**Chemistry AP-Density**

The density of osmium is 22.57g/cm3. If a 1.00kg rectangular block of osmium has two dimensions of 4.00cmx4.00cm, calculate the third dimension of the block.

*August 17, 2010 by Victoria*