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September 30, 2014

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Number of results: 6,756

Physics
A chunk of metal with a mass of 81.1 grams and a specific heat of 153 joules per kilogramkelvin is heated to 95.7 degrees Celsius and placed in 144 milliliters of water at 19.5 degrees Celsius. What are the final temperatures of the metal and the water?
December 12, 2013 by Matt

Chemistry
In a previous experiment, 0.800 g of the green complex iron salt was placed in an Erlenmeyer flask and heated with concentrated sulfuric acid until all oxalate ion was destroyed (CO2, SO2 and H2O are formed). Ferric ion (Fe3+) remained in solution and was reduced to Fe2+ by ...
May 7, 2007 by Linda

Chemistry 1201
Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O(g)-> 8CO2(g)+10H2O(l) At 1.00 atm and 23C , what is the volume of carbon dioxide formed by the combustion of...
April 15, 2012 by John

Chemistry 1201
Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O(g)-> 8CO2(g)+10H2O(l) At 1.00 atm and 23C , what is the volume of carbon dioxide formed by the combustion of...
April 15, 2012 by John

Physics
A g (pronounced "gee") is a unit of acceleration. Notice it is italicized. This is so it won't be confused with g (grams). 1 g = 9.8 m/s2. Typically a person will black out if they experience an acceleration of 4 to 6 g for more than a few seconds. Determine how fast an object...
September 6, 2012 by Cindy

Chemistry
Al+S=Al2S3 Balanced equ= 2Al+3S=Al2S3 10 grams of Al were mixed with 15 gram of S Find: limiting reagent al or s? How much Al2S3 were formed in reaction? What is the excess reagent?Al or S? How much excuss reagent left over after reactin? Thanks! <3
November 20, 2012 by malina

chemistry
how much heat is required to completely vapporize 2.3 grams of ice starting at -50 degrees Celsius? (the specific heat of ice is 2.0 J/g.C; the specific heat of water is 4.184 J/g.C; the heat of fusion is 333 J/g; and the heat of vaporization is 22601 J/g)
March 22, 2011 by Anonymous

Chemistry- please check my work
Question: When 1.97 grams of Pb(OH)2(s) is added to 1.00 liter of pure water at 25 C a saturated solution (some solid is present) is formed that has a pH of 8.97. Compute the Ksp value for Pb(OH)2 using the data. [OH]= 9.334e-6 and the [Pb^+2]= 9.334e-6/2= 4.667e-6. So the ksp...
May 12, 2009 by Anonymous

science
5.00 lb of mercury is spilled onto a counter and forms a circular puddle with a diameter of 67.2 cm. Assuming the puddle is cylindrical shape, what is the thickness of the puddle of mercury? Extra info: [1 lb = 435.6 g. Mercury is a liquid metal having a density of 13.6 g/mL. ...
September 6, 2011 by Monica

chemistry
consider the reaction, 2Al(OH)3+3H2SO4---->Al2(SO4)3+6H2O a. Given that 152g of H2SO4 reacts with 234g of Al(OH)3 Howmany grams of Al2(SO4)3 will be theoretical generated? b. which of the reactants is the limiting reagent? c. If the actuall yield was 135 g Al(SO4)3, what is...
October 8, 2011 by lucky

Chemistry
A Student Performing a lab weighed a 1.0993g sample, containing an unknown KHP, which required 18.06mL of 0.1879M NAOH to reach the phenolphtalein endpoint. a) How many moles of base were consumed by the KHP in this sample? b) How many grams of KHP were titrated? c)What is the...
May 9, 2012 by Brittany

ap chem
A sample of 7.45 grams of NaOH is dissolved into 609 mL of aqueous 0.250 M NaOH (as-sume no volume change). This solution is then poured into 2.18 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
September 16, 2012 by cheri

chemistry
A sample of 6.65 grams of NaOH is dissolved into 621 mL of aqueous 0.250 M NaOH (as- sume no volume change). This solution is then poured into 2.16 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
December 18, 2012 by lauren

chemistry
14 carat gold has a purity of 58.3%. how many moles of gold are in 155 grams of 14 carat gold? answer in units of moles.
September 8, 2010 by Jordyn

chem
14 carat gold has a purity of 58.3%. How many moles of gold are in 137 grams of 14 carat gold? Answer in units of moles.
February 1, 2011 by pho le

chemistry
if aluminum chloride and copper sulfate make 48g of aluminum sulfate how many grams of copper sulfate was used ?
July 26, 2011 by serg

AP Chemistry
14 carat gold has a purity of 58.3%. How many moles of gold are in 172 grams of 14 carat gold? Answer in units of moles
September 19, 2012 by Lacey

Physics
how many grams of water at 20 degrees celcius are necessary to change 800.0g of water at 90.0 degrees celsius to 50.0 degrees celcius?
July 21, 2013 by Dale

chemistry
calculate the energy required to raise the temp. of 170.0 g of silver (specific heat = .24 joules/celsius times grams) from 273K to 301K. I know the equation and I got 1142.4 joules but need to get to 2 sig figs, so I converted it to 1.1 x 10^4 which is right, but it doesn't ...
November 6, 2007 by Avonlea

statistics
Five samples are taken every hour from a production line & the average hourly measurement weight of polymer beads is recorded. Approximately 1/7 of these averages exceed 2.50g when the mean value is approximately 2.40g. Determine the proportion of individual readings exceeding...
September 22, 2012 by Wasl

chemistry
How many grams of solid copper must react with silver nitrate, AgNO3(aq), to produce 5.5 g of solid silver and copper(II) nitrate, Cu(NO3)s(aq)?
March 20, 2011 by franci

science
Megan could dissolve only 36 grams of salt in 100ml of water. Describve what she could do if she wanted to dissolve more salt in 100ml of water?
September 4, 2011 by Abii

AP Chemistry
The combustion of 1.00 mol of sucrose,C12H22,O11, evolves 5650 kJ of heat. A bomb calorimeter has a calibrated heat capacity of 1.23 kj/degree Celsius. How many grams of sucrose should be burned to raise the temperature of the calorimeter and its contents from 23 degrees C to ...
February 15, 2010 by Andrew

Chemistry
If 48.1 g of solid Al2S3 and 6.68 mL of liquid H2O are reacted stoichiometrically according to the balanced equation, how many grams of solid Al2S3 remain? Al2S3(s) + 6H2O(l) → 2Al(OH)3(s) + 3H2S(g) I found that the limiting reagent, .6406mol of Al2S3 and .1226mol of H2O...
June 4, 2010 by Judy

Chemistry
A sample of 7.52 grams of Na OH is dissolved into 675 mL of aqueous M NaOH (assume no volume change). This solution is then poured into 1.95 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? Answer in...
September 23, 2010 by Cheyenne

chemistry
How many grams of oxygen gas are required to produce 7.46 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water? 2 H2(g) + O2(g) → 2 H2O(g) ΔH = −484 kJ Liquid water has a heat of vaporization of 44.0 kJ per mole at 25C.
October 29, 2010 by caroline

chemistry
How many grams of oxygen gas are required to produce 7.46 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water? 2 H2(g) + O2(g) → 2 H2O(g) ΔH = −484 kJ Liquid water has a heat of vaporization of 44.0 kJ per mole at 25C.
October 31, 2010 by Emily

Chemistry
How many milliliters of 0.710 M HCl are required to react with 47.80 grams of CaCO3 ? Given the balanced reaction equation: 6 FeCl2(aq) + K2Cr2O7(aq) + 14 HCl(aq) 6 FeCl3(aq) + 2 CrCl3(aq) + 2 KCl(aq) + 7 H2O(l) How many moles of FeCl2(aq) are required to produce 2.811 mol of ...
November 28, 2010 by Lena

chemistry
The decomposition of potassium chlorate, KClO3, gives oxygen gas and solid potassium chloride. How many grams of KClO3 are needed to produce 5.00 L of Oxygen gas at STP? Suppose that the reaction described above produces 4.80 L of O2 in the laboratory. What is the percent yield?
April 10, 2012 by Emily

CHEM
Silicon carbide, commonly known as carborundum, is a very hard and abrasive substance. The compound is prepared by heating silicon dioxide in the presence of graphitic carbon: SiO2(s) + 2C(s) --> SiC(s) + CO2(g) How many grams of silicon carbide can be formed from 55.0 g of...
October 18, 2012 by Lena

Chemistry
Upon heating 8.5g sample of Sodium Sulfate hydrate, it loses 4.776 grams after heating. What steps are necessary for me to find the n for the hydrate? GIVEN: Na2SO4 - n H2O the molar mass of sodium sulfate is 142.05g/mol
September 24, 2013 by Peytreshia

chemistry
We calculated that 30.0 grams of ice initially at -10.0 Celsius and it requires 23.1 kj of energy to bring it all the way to a boil. How much additional energy does it take to convert all of the water to steam at 100 degree Celsius? How does this compare to what we calculated ...
May 4, 2014 by mai

chemistry
What mass in grams of sodium hydroxide is produced if 20.0 g of sodium metal reacts with excess water according to the chemical equation 2Na(s)+2H20(l)=2NaOH(aq)+H2(g)? Please show me step by step how to do this because I have 5 other questions like this one on a worksheet and...
April 17, 2008 by Chris

chem
how to set up or approach these 1. Calculate the mass in grams of iodine (I2) that will react completely with 48.9 g of aluminum (Al) to form aluminum iodide (AlI3). Do I need to find the mass as a whole for the entire compound, then convert? 2. The formula for rust can be ...
February 9, 2009 by hannah

please chem" help"
a quantity of 0.5 g of crystalline NaCl is added to one liter of soultion containing 10e-3 mol of dissolved Ag+ demonestrate that AgCl precipitate from the solution and calculate the wight og AgCl in grams that form per liter. Assume that all activities coefficients are equal ...
September 19, 2010 by moon

chemistry
The composition of a propane clathrate was found to contain 40.1 mL of water. Assuming that all the cavities of the clathrate was filled with propane, how many grams of propane did the clathrate contain?
February 16, 2009 by Valerie

Chemistry
35 grams of sodium phosphate are mixed with enough water to make 3.5L of solution having a densityof 1.045g/mol. Find the concentration of sodium phosphate in ppm. Using the same information, find the molarity of the sodium and phosphate ions.
February 15, 2012 by Kristen

Physics
One of the more unusual of world wonders is the plain of jars in laos. Several hundred huge stone jars, which do not seem to made from rock, are scattered across the plain. The largest of these jars has a mass of around 6.0 x 10^3 kg. Express this mass in A. milligrams B. mega...
September 9, 2009 by NoNo100

Chemisty
In an experiment, 230 kJ of heat energy are released to the surroundings when steam is converted to liquid water. Calculate the number of grams of water condensed. The following data may be of use: vap = 2260 J/g; Hfus = 334 J/g; Cp(ice) = 2.06 J/g C...
April 8, 2010 by Stephen

physics
What mass (in grams) of steam at 100C must be mixed with 341 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 57.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
April 15, 2011 by tim

physics
What mass (in grams) of steam at 100C must be mixed with 446 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 65.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
April 1, 2013 by safc

chemistry
What is the pH of a buffer solution that is made by adding 21.0 grams of sodium fluoride to 1.00 Liter of 0.15M hydrofluoric acid? (see the Table above for the Ka of hydrofluoric acid; calculate the pH to 2 decimal places) hint: you will have to find the molarity of NaF in ...
June 16, 2013 by dennis

chemistry
What is the pH of a buffer solution that is made by adding 21.0 grams of sodium fluoride to 1.00 Liter of 0.15M hydrofluoric acid? (see the Table above for the Ka of hydrofluoric acid; calculate the pH to 2 decimal places) hint: you will have to find the molarity of NaF in ...
June 16, 2013 by Dennis

Chemistry
What is the pH of a buffer solution that is made by adding 21.0 grams of sodium fluoride to 1.00 Liter of 0.15M hydrofluoric acid? (see the Table above for the Ka of hydrofluoric acid; calculate the pH to 2 decimal places) hint: you will have to find the molarity of NaF in ...
June 17, 2013 by D.J.

chemistry 101
I have a question that I am not sure how to even start. A 15.0 g sample of a liquied has a density of 0.875 g/ml a what is the voulme in milliters of the liquid? use conversion factors to calculate answer b. What mass, in grams of the liquid is in 34.6ml of the liquid? I am ...
September 5, 2013 by louise

HELP!! Chemistry
Round your answer to the correct number of significant digits and show work. 1. How many grams of NaI would be used to produce a 2.0 M solution with a volume of 10.00 L? 2. What is the molarity of a 2.50 x 102 cm3 solution containing 450.0 g of C6H12O6 ? 3. How many moles of ...
September 26, 2013 by _Unknown

Chemistry honors
Formula: 2LiOH + CO2 yields Li2CO3 +H2O Suppose a lithium hydroxide canister contains 155grams of LiOH. What mass of CO2 will the cannister be able to absorb? If it is found that after 24 hours of use the cannister has absorbed 102 grams of CO2. What percentage of its capacity...
January 22, 2013 by Liem

Basic Engineering2. Materials Science
Boron is used to dope 1 kg of germanium (Ge). How much boron (B) is required to establish a charge carrier density of 3.091e7/cm^3. One mole of germanium has a volume of 13.57 cm^3 and weighs 72.61 gram. Give answer in grams of boron? I have no idea how to solve this problem. ...
December 4, 2012 by Ray

chemistry
Determine the amount (in grams) of boron required to be substitutionally incorporated into 1.000 kg of germanium in order to achieve a charge carrier density of 3.091 x 1017/cm3. Assume intrinsic carriers are negligible. What type of conduction will be present in this material...
December 21, 2013 by Dick

physics
A piece of metal with a density of 4.69g/cm^3 and a mass of 1500 grams, is submerged in a container of oil, with a density of .75 g/cm^3. What volume of oil does the metal displace? Work: 4.69g/cm^3->4690kg/m^3 1500g->1.5kg .75g/cm^3->750kg/m^3 I'm not sure what ...
December 26, 2007 by Anonymous

SCIENCE?CHEMISTRY***
DR Bob, can you go thru the steps to work this out please.... how many grams of alcohol with a density of 0.900 g/cm ^3 (cm cubed) will have the same volume as 20.0g of mercury,with a density of 13.6 g/cm ^3 Do you have to find the volume of mercury first??? I know the answer ...
May 14, 2010 by ANDY

chemistry
Dissolve 1.5g of an unknown salt into 37g of water and find that the new vapor pressure at 75C is 277 torr. What is the Molar Mass of the unknown? How many grams of the unknown would have to be used in 100ml of water to make a 11.5% solution by mass of the unknown?
December 5, 2010 by regina

chemistry
2Na3PO4(aq)+3 Ba(NO3)2(aq)---->Ba3(PO4)2(s)+6NaNO3(aq) a solution containing 3.50g of Na3PO4 is mixed with a solution containing 6.40g of Ba(NO3)2 how many grams of product can be formed? and if the above reaction resulted in 3.659 g of white powder, what is the percent ...
November 17, 2011 by mckayla

Hudson
In a calorimetric experiment, 6.48 grams of lithium hydroxide was dissolved in water. The temp of the calorimeter rose from 25 celcius to 36.66 celcius. What is the molar change in enthalpy for this procces? LiOH(s) -> Li(aq) + OH (aq) (the heat capacity of the calorimeter ...
October 8, 2012 by k-dawg

college chemistry
to calulate the calories(kcal) in 1/2 cup of soft ice cream that contains 16g carbs, 17g fat, 5g protein. do I multiply 16g x 4 for carbs 17g x 9 for fat 5g x 4 for proteins? then do I do conversion factors for grams to 1/2cup? am I on the right road?
February 4, 2014 by Linda

physics
How many grams of coffee must evaporate from 350 g of coffee in a 100-g glass cup to cool the coffee from 95.0C to 45.0C ? You may assume the coffee has the same thermal properties as water and that the average heat of vaporization is 2340 kJ/kg (560 cal/g). (You may neglect...
April 27, 2014 by Mohanad

Chemistry
I'm not sure if i did this problem right or not. I keep reading through my book, and i think i followed the equations right, but i'm not confident with my answers. The problem: 5.0 g of glucose,C6H12O6, is disolved in 500.0 g of acetic acid. What is the new freezing point and ...
October 22, 2010 by Angelina

chemistry
A solution is prepared by dissolving 10.00 grams of a monobasic salt in a total volume of 1.00 litres. The pH of this solution was measured at 13.07 and a conductivity experiment determined that this salt was completely ionized in solution. What is the molecular weight of this...
January 29, 2014 by Temmi

Nutrition
I need to know in what cells, liver, muscle, adipose, or all of the above do the following reactions take place: fatty acid synthesis Synthesis of cholesterol synthesis of LDL and HDL lipolysis lipogenesis synthesis of glucose from glucogenic carbon chains synthesis of fatty ...
March 18, 2007 by Jill

physics
how much heat is required to vaporize 7 grams of ice initially at 0 degrees celsius when the latent fusion of ice is 80 cal/g, the vaporization of water is 540 cal/g, and the specific heat of water is 1 cal/(g x C)?
February 19, 2010 by elisabeth

chemistry
A precipitate of calcium phosphate is formed when aqueous solutions of sodium phosphate and excess calcium chloride are mixed. If 100.0 mL of 1.5 M sodium phosphate solution is the limiting reactant, how many grams of calcium phosphate can be expected?
September 3, 2010 by Ethan

11th grade
A 36.5 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 10 grams. What was the percent iron in the sample of ore?
September 15, 2010 by Anonymous

Chemistry
How many grams of nickel (II) sulfate hexahydrate would be present in one liter of a 0.40 molar solution? (Hint: a 1.0 molar solution would have 1 mole of NiSO4*6H2O per liter of solution)
April 10, 2011 by Jon

chemistry
Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas. What mass of hydrochloric acid reacts when 87.7 grams of aluminum dissolves? The equation is 2Al+6HCl=2AlCl3+3H2
January 31, 2012 by Kendall

chemistry 1
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction How many grams of calcium carbonate are needed to produce 49.0 of carbon dioxide at STP?
May 2, 2010 by safwan hakim

chemistry
a sample of indium chloride is known to be contaminated with sodium chloride. The contaminated sample weighs 2.87 g. When the contaminated sample is treated with excess AgNO3(aq), 5.79 grams of AgCl(s) are obtained. What is the percentage by mass of InCl3 in the sample?
November 22, 2010 by Anonymous

science
tori wants to increase the tempreature of 500 grams of water from 20 degrees celcius to 100 degrees celecius if the specific heat of water is 4.18j/g. degrees celcius how much heat is needed ?
March 1, 2011 by nikita

chemistry
A 28.6 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 10.1 grams. What was the percent iron in the sample of ore?
August 30, 2012 by Nick

physics
The weight of an object changed by +25.0%. The object's final weight was 2.5 grams. What is the initial weight of the object?
March 28, 2011 by Anonymous

chemistry
Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)-2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2
June 25, 2010 by Ana

chemistry
Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)-2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2
June 25, 2010 by Ana

chemistry
A 46.9 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 11.6 grams. What was the percent iron in the sample of ore? Answer in units of %
August 30, 2011 by Anonymous

ap chemistry
A 25.2 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 12 grams. What was the percent iron in the sample of ore? Answer in units of %
September 10, 2012 by cheri

chemistry
what mass of ammonium chloride is dissolved in 100 grams water in each of the following solutions in 1.10 molal NH4Cl solution, in a solution which is 75% water by mass in solution with a mole fraction of 0.15 NH4Cl? please help me solve this problem. thank you!
February 27, 2013 by andrea

AP Chemistry
A 40.3 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 10.5 grams. What was the percent iron in the sample of ore? Answer in units of %
August 30, 2013 by Gabriella

AP Chemistry
A 44.6 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 10.1 grams. What was the percent iron in the sample of ore? Answer in units of %
September 2, 2013 by Anonymous

Chemistry
in this experiment you are you will begin by preparing a dilute soultion of sodium hydroxide by taking 50 ml of 3 M NaOh stock solution and diluting it with 250 ml of water. i found that and the answer was .5 but how do i do this b. calculate the number of moles and grams of ...
February 23, 2010 by Chris

Chemistry
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas. How many grams of calcium carbonate are needed to produce 81.0 of carbon dioxide at STP? Is the asnwer 80.95
September 21, 2008 by George

chemistry
The relative sweetness of sucralose is 60000. The relative sweetness of sugar is 100. How many grams of sucralose would you need for a solution that has the same sweetness as one made with 2.00g of sugar?
April 30, 2012 by msladycap

Chemistry Pretest
1. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W, atomic number= 74)? **Formula mass of FeWO4 is 303.69** a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4
September 28, 2012 by Sarah

chemistry
Calcium reacts with water to yield calcium hydroxide and water according to the following equation: Ca + 2H2O ==> Ca(OH)2 + H2 . How many moles of hydrogen will be produced if 3115.8 grams of calcium hydroxide is produced?
January 25, 2013 by charlene W

chemistry
calcium hydroxide reacts in a neutralization reaction with sulfuric acid in a 1:1 ratio to form water and calcium sulfate. if you have 23.5 grams of calcium hydroxide, how many milliliters of water can you form? how do i use dimensional analysis to solve this?
December 12, 2008 by lyne

Chemistry
I have no idea what I'm doing wrong here... Question: A solution is 0.3% by mass calcium chloride. Therefore, 145 g of the solution contains how many grams of calcium chloride? My solution: 145g x (0.3g / 100g) = 0.435g or 0.44g CaCl2 What am I doing wrong? Thank you!
May 9, 2010 by Jake

Chemistry
I have no idea what I'm doing wrong here... Question: A solution is 0.3% by mass calcium chloride. Therefore, 145 g of the solution contains how many grams of calcium chloride? My solution: 145g x (0.3g / 100g) = 0.435g or 0.44g CaCl2 What am I doing wrong? Thank you!
May 9, 2010 by Jake

chemistry
a hydrated salt is a solid that includes water molecules within its crystal structure. a student heated a 9.10-gram sample of a hydrated salt to a constant mass of 5.41 grams. what percent by mass of water did the salt contain?
November 28, 2010 by Hank

Science 8R - Homework Qs. Check
If an object has mass of 70.5g and a volume of 64 cm(3), what is its Density? Will it sink or float and why? Answer - The Density of this object is 4512g/cm(3). It will sink because the amount of grams is a lot. Is the answer correct and good???? I multiplied 70.5 and 64 in ...
October 15, 2012 by Laruen

Chemistry Stoichiometry
Sulfuric acid can dissolve aluminum metal according to the following reaction. Suppose you wanted to dissolve an aluminum block with a mass of 25.7 . How many grams of H2 gas would be produced by the complete reaction of the aluminum block?
October 27, 2012 by Brianna

Math - Exponential Decay
Radium decays exponentially. Its half-life is 1,690 years. How long will it take for a 50-gram sample of radium to be reduced to 5 grams? 1/2P = Pe^(-1690k) (ln1/2)/(-1690) = k 4 x 10^-4 = k 5 = 50e^-kt ln0.1 = -kt ln0.1/-k = t 5,630 years = t ...but textbook answer is 5,614 ...
January 24, 2009 by Anonymous

thermal physics
What mass (in grams) of steam at 100C must be mixed with 340 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 12.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
March 23, 2009 by chirayu

thermal physics
What mass (in grams) of steam at 100C must be mixed with 340 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 12.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
March 25, 2009 by chirayu

college chem
how many grams of NH4Cl are required to prepare 250 mL of .122 M NH4Cl solution? I set this up using the molarity equation and the part that I was missing is moles. So I divided the 0.122 by .25 L and got .031 mol. Then I took that and multiplied it by the molar mass of NH4Cl ...
June 2, 2009 by kelly

Chemistry help
I'm not sure how to answer this question.... Assume that magnesium would act atom-for-atom exactly the same as copper in this experiment. How many grams of magnesium would, have been used in the reaction if one gram of silver were produced? The atomic mass of magnesium is 24....
February 15, 2010 by Kelsey

chemistry
I'm kind of having difficulty with a question involving dimensional analysis. I'm confused how I would convert some units into others and what to divide. Here's the question. One 5lb Hershey's kiss is equivalent to how many little Hershey's Kisses? (1 Hershey Kiss is equal to ...
October 30, 2010 by Nick

chemistry
We have not even covered this material. Samples of 131I take 10 hours to prepare to ship. It takes 2 weeks to get to its destination. How much 131I must be produced to ensure the patient receives 8 grams of NaI using the 131I isotope in the compound? Does this have to do with ...
November 24, 2012 by What?

HELP URGENT Phyiics
What mass (in grams) of steam at 100C must be mixed with 446 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 65.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
April 12, 2013 by HELP

physical mod
What mass (in grams) of steam at 100C must be mixed with 462 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 40.0C? The specific heat of water is 4186 J/kgK. The latent heat of fusion is 333 kJ/kg, and the latent heat of ...
September 13, 2013 by adrian

math
One-half serving of soy sauce contains 389 milligrams of sodium. How many grams of sodium from soy sauce are included in an egg-foo-young dish made from 4 servings of soy sauce? Round results to the nearest tenth of a gram.
December 20, 2009 by kate

Chemistry
Use the chemical reaction below to answer the questions that follow. CuO(s) + H2(g) → Cu(s) + H2O(g) a. What is the limiting reactant when 19.9 g CuO react with 2.02 g H2? b. The actual yield of copper was 15.0 g. What is the percentage yield? c. How many grams ...
March 16, 2011 by Kayla

Molecular Formula
How do you work out the molecular formula? Generally you convert grams to mols, then find the ratio of the atoms to reach other. But this is all generality. Why don't you post the entire problem, tell us what you know how to do and what you don't understand about it and let us...
February 3, 2007 by L0bster_quadrille

Gen Chem
Chromium can be electroplated from an aqueous solution containing sulfuric acid and chromic acid, H2CrO4. What current is required to deposit chromium at a rate of 1.25 g/min? 1mol H2CrO4 has 51.996 grams current= coulomb/sec How do I convert to get coulombs from the problem?
March 28, 2008 by Sarah H

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