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November 23, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
It takes how many ml of 1.5 M NaCl to make 500 ml of .38 M NaCl?
Monday, October 6, 2014 at 10:05pm

chemistry
A 26.6 g sample of an unknown compound contains 0.8 g of oxygen. What is the percent by mass of oxygen in the compound?
Monday, October 6, 2014 at 9:56pm

chemistry
Magnesium combines with oxygen to form magnesium oxide. If 20.07 g of magnesium reacts completely with 6.70 g of oxygen, what is the percent by mass of oxygen in magnesium oxide?
Monday, October 6, 2014 at 9:56pm

chemistry
Copper sulfide is formed when copper and sulfur are heated together. In this reaction, 132 g of copper reacts with 53 g of sulfur. After the reaction is complete, 9 g of sulfur remains unreacted. What is the mass of copper sulfide formed?
Monday, October 6, 2014 at 9:55pm

chemistry
When mercury oxide is heated, it decomposes into mercury and oxygen. If 26.8 g of mercury oxide decomposes, producing 1.8 g oxygen, what is the percent by mass of mercury in mercury oxide?
Monday, October 6, 2014 at 9:52pm

Chemistry
Classify each as carbohydrate, protein, lipid, or nucleic acid. 1. Starch 2. Cholesterol 3. Steroids 4. Glycogen
Monday, October 6, 2014 at 8:15pm

chemistry
How many moles of molecules are in 198 g of hydrogen nitrate (HNO3)? Answer in units of mol
Monday, October 6, 2014 at 8:01pm

Chemistry
The solubility of KNO3 is 80g/100g water at 50 degrees and 10g/100g water at 0 degrees. The solubility of CuSO4 is 60g/100g water at 50 degrees and 20g/100g water at 0 degrees. A mixture contains 13.8g of KNO3 and 1.94g of CuSO4. A) Calculate the minimum mass of water that ...
Monday, October 6, 2014 at 7:52pm

chemistry
A 22.0 g piece of alloy at 264.8°C is dropped into a simple calorimeter that contains 175.0 g of water. The temperature of the calorimeter water increased from 20.4°C to 23.1°C. Calculate the specific heat capacity of the alloy.
Monday, October 6, 2014 at 7:49pm

CHEMISTRY 45
Calculate the average speed of an oxygen gas molecule, O2, at 21.0∘C . ------------------------- How much faster do ammonia (NH3) molecules effuse than carbon monoxide (CO) molecules? --------------------------- Highest rate of effusion to lowest rate He, H2S, C3H8, Ar, H2
Monday, October 6, 2014 at 7:47pm

CHEMISTRY 44
A syringe containing 1.65mL of oxygen gas is cooled from 91.3∘C to 0.5∘C. What is the final volume of oxygen gas? I got 2.19ml???
Monday, October 6, 2014 at 7:45pm

CHEMISTRY 3
Consider the following balanced equation: 2N2H4(g)+N2O4(g)→3N2(g)+4H2O(g) Complete the following table showing the appropriate number of moles of reactants and products. If the number of moles of a reactant is provided, fill in the required amount of the other reactant, ...
Monday, October 6, 2014 at 4:16pm

Principles of Chemistry
A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 L and the initial pressure of chlorine was 1.30atm . The piston was pushed down to change the volume to 1.00 L. Calculate the final pressure of the gas ...
Monday, October 6, 2014 at 3:38pm

CHEMISTRY 2
A 56.0mL sample of a 0.102 M potassium sulfate solution is mixed with 34.7mL of a 0.114 M lead acetate solution and this precipitation reaction occurs: K2SO4(aq)+Pb(C2H3O2)2(aq)→PbSO4(s)​+2KC2H3O2(aq) The solid PbSO4 is collected, dried, and found to have a mass of...
Monday, October 6, 2014 at 2:07pm

CHEMISTRY 1
What is the correct net ionic equation, including all coefficients, charges, and phases, for the following set of reactants? Assume that the contribution of protons from H2SO4 is near 100 %. Ba(OH)2(aq)+H2SO4(aq)→ Express your answer as a chemical equation. This is what ...
Monday, October 6, 2014 at 2:06pm

chemistry
4. If you were asked to determine the number of atoms in a 52.0 gram sample of carbon, how would you set up the conversion? What is the final answer with correct units?
Monday, October 6, 2014 at 1:30pm

Chemistry
How to convert 24.63cm to nm^2
Monday, October 6, 2014 at 11:06am

Chemistry
Report 2 decimal places and appropriate units, the molar mass of steric acid (C17H35COOH). Please help
Monday, October 6, 2014 at 11:04am

Chemistry
How many moles of steric acid are contained in 0.25mL of a hexane solution containing 5.4x10^-4 grams of steric acid/L? (Hint: g/L x L = g/ (g/mol)=mol). Please show your work. Please help. Thank you
Monday, October 6, 2014 at 11:03am

Chemistry
why hcl dissociates more fastly than ether, reason ?
Monday, October 6, 2014 at 10:24am

chemistry
What mass of HCL is present in 0.80 molar, 2500mL solution?
Monday, October 6, 2014 at 9:46am

Chemistry
CH ≡ CH + 2AgNO3 → AgC ≡ CAg + 2HNO3 represents which property of acetylene. A. Basic B Acidic. √ answer is acidic, now i want to ask that how we can know that in this question , acidic is the property of acetylene? help? someonoe told me that more ...
Monday, October 6, 2014 at 9:26am

Chemistry
AgCl <------> Ag+ + Cl- , the Ksp for the reaction will be . Ksp = [Ag+] [Cl-] how?
Monday, October 6, 2014 at 9:25am

Chemistry
Construct a cycle with the following steps: Begin with: 1 mol ideal monatomic gas at 300 K and 1 bar. Point A. 1. Isothermal reversible expansion till volume gets twice its original value. Point B. then, 2. Irreversible adiabatic expansion against P_ext=0.25 bar till P_ext=...
Monday, October 6, 2014 at 4:59am

Chemistry
Report 2 decimal places and appropriate units, the molar mass of steric acid (C17H35COOH). Thank you
Monday, October 6, 2014 at 4:14am

Chemistry
How many moles of steric acid are contained in 0.25mL of a hexane solution containing 5.4x10^-4 grams of steric acid/L? (Hint: g/L x L = g/ (g/mol)=mol). Please show your work. Please help. Thank you
Monday, October 6, 2014 at 3:57am

Chemistry
I need help with two problems need helps please!! 1) Calculate the surface area in nm^2 of a water solution contained in a watch glass with a diameter of 5.6cm. Remember that the area of a circles is calculate as A=πr2 and diameter= 2r 2) If a molecule of stearic acid ...
Monday, October 6, 2014 at 3:53am

chemistry
Al(oH)3+HcL=
Monday, October 6, 2014 at 2:31am

chemistry
Nh3+ch3coo=
Monday, October 6, 2014 at 2:09am

chemistry
A 2.00 gram sample of Copper (II) acetate produced 2.48 grams of a Copper (II) Formate Hydrate. After heating the sample the final mass of the Copper (II) Formate was 1.69 grams. What was the degree of hydration for the Copper (II) Formate?
Monday, October 6, 2014 at 1:59am

Chemistry
A compound contains only potassium and iodine. A sample weighing 12.3 g of this compound contained 2.90 g of potassium. How many grams of iodine would there be in another sample of this compound containing 9.56 g of potassium? Do I find the mol of each (12.3 g, 2.90 g) or am I...
Monday, October 6, 2014 at 1:35am

CHEMISTRY
A sprinter set a high school record in track and field, running 200.0 m in 21.5s . What is the average speed of the sprinter in kilometers per hour?
Monday, October 6, 2014 at 12:58am

Chemistry
A specific brand of gourmet chocolate candy contains 7.00 g of dietary fat in each 22.7-g piece. How many kilograms of dietary fat are in a box containing 4.00lb of candy?
Monday, October 6, 2014 at 12:55am

chemistry
n the spectroscopic analysis of many substances, a series of standard solutions of known concentration are measured to generate a calibration curve. How would you prepare standard solutions containing 10.0, 25.0, 50.0, 75.0, and 100. ppm of copper from a commercially produced ...
Monday, October 6, 2014 at 12:21am

Chemistry
In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 38.0mi/gal , how many liters of gasoline would you need to buy to complete a 142-km trip in Europe? Use the following conversions: 1km=0.6214mi and 1gal=3.78L.
Sunday, October 5, 2014 at 11:55pm

CHEMISTRY
How does hydrogen bonding in water affects Density?
Sunday, October 5, 2014 at 11:19pm

CHEMISTRY
Total Pressure in a vessel containing Oxygen collected over water at 25 *C was 723 torr. The Vapor Pressure of water at that Temperature is 23.8 torr. What was the pressure of gas?
Sunday, October 5, 2014 at 11:16pm

chemistry
Discuss how you would seperate Fe+3 from Ca2+
Sunday, October 5, 2014 at 10:19pm

Chemistry
What functional groups do uracil,guanine,cytosine, and tyrosine belong to.
Sunday, October 5, 2014 at 9:35pm

Chemistry
The oxidation of iodide ion by arsenic acid, H3AsO4, is described by the balanced equation 3I−(aq)+H3AsO4(aq)+2H+(aq)→ I3−(aq)+H3AsO3(aq)+H2O(l) If −Δ[I−]/Δt = 4.8×10−4M/s , what is the value of Δ[I3−]/Δt ...
Sunday, October 5, 2014 at 9:33pm

Chemistry
The oxidation of iodide ion by arsenic acid, H3AsO4, is described by the balanced equation 3I−(aq)+H3AsO4(aq)+2H+(aq)→ I3−(aq)+H3AsO3(aq)+H2O(l) If −Δ[I−]/Δt = 4.8×10−4M/s , what is the value of Δ[I3−]/Δt ...
Sunday, October 5, 2014 at 9:18pm

chemistry
A pure gold ring with a volume of 1.88cm3 is initially at 18.4∘C. When it is put on, it warms to 34.3∘C.
Sunday, October 5, 2014 at 9:16pm

Chemistry
What volume of 0.1000 M oxalic acid (a diprotic acid) would be required to completely neutralize 100.00 mL of 0.1000 M NaOH?
Sunday, October 5, 2014 at 8:17pm

Chemistry
The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.500C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is cholesterol . How many grams of cholesterol, C27H46O (386.6 g/mol), must be dissolved in 208.0 grams of diethyl ether to raise the ...
Sunday, October 5, 2014 at 8:03pm

Chemistry
Naturally occurring copper is a mixture of two isotopes. One of these has 34 neutrons the other has 36. If the relative atomic mass of copper is 63.55 amu calculate the natural abundances (percentages ) of the two isotopes.
Sunday, October 5, 2014 at 7:55pm

Chemistry
What volume of 0.1000 M oxalic acid (a diprotic acid) would be required to completely neutralize 100.00 mL of 0.1000 M NaOH?
Sunday, October 5, 2014 at 7:48pm

Chemistry
A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?
Sunday, October 5, 2014 at 4:44pm

chemistry
What is the percent mass of calcium in a calcium supplement if 1.06 g of calcium carbonate is extracted from a 2.82 g pill
Sunday, October 5, 2014 at 4:30pm

Chemistry
In chemistry, we did a lab in which we had a certain mass of copper, performed multiple experiments on the copper, and at the end, extracted the copper from a solution and weighed it. The goal was that the mass of the final copper should be the same as the mass of the initial ...
Sunday, October 5, 2014 at 4:12pm

chemistry
how many grams of zinc chloride could be formed from the reaction of 3.57 g of zinc with excess HCL
Sunday, October 5, 2014 at 4:09pm

Chemistry Help! (Rydberg Equation)
a) According to the Rydberg equation, the line with the shortest wavelength in the emission spectrum of atomic hydrogen is predicted to lie at a wavelength (in nm) of _____ b) According to the Rydberg equation, the longest wavelength (in nm) in the series of H-atom lines ...
Sunday, October 5, 2014 at 2:45pm

Chemistry
a) A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg? b) For potassium metal, the work function W (the minimum energy needed to eject an electron from the metal surface) is 3.68 × 10-19 J. Which ...
Sunday, October 5, 2014 at 2:41pm

CHEMISTRY
Consider the following balanced equation: 2N2H4(g)+N2O4(g)→3N2(g)+4H2O(g) Complete the following table showing the appropriate number of moles of reactants and products. If the number of moles of a reactant is provided, fill in the required amount of the other reactant, ...
Sunday, October 5, 2014 at 12:25pm

Chemistry
c) How many grams of each matter is in 2,0 litres of the following water solutions i) 8,6 til-% ethanol solution ii) 22,6 til-% glycol solution (1,2-ethanediol)
Sunday, October 5, 2014 at 9:48am

chemistry
When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?
Sunday, October 5, 2014 at 8:32am

chemistry
Following oxidation-reduction reaction by using the oxidation state method a) O2+H2O+Pb=Pb(OH)2
Sunday, October 5, 2014 at 12:41am

Chemistry
a piece of silver contains 6.42x10^22 how many dozens does it contain
Saturday, October 4, 2014 at 10:15pm

Chemistry
How do I solve these problems You have 2000. g of aqueous NaOH solution. The percent by mass of the solute is 4.25%. How many grams of NaOH are in the solution? If you have 100.0 mL of a 25.0% aqueous solution of ethanol, what volumes of ethanol and water are in the solution?
Saturday, October 4, 2014 at 10:03pm

chemistry
what is the concentration in ppm of Ag in a 245 lb of Ore that contains 83.5 g of silver?
Saturday, October 4, 2014 at 9:15pm

chemistry
Identify the functional groups in menthol
Saturday, October 4, 2014 at 7:41pm

Chemistry
Weight of the Rock Salt Sample: .343 (g) Weight of the Rock Salt Solution: 9.910 (g) Trial #1 Trial #2 Trial #3 Weight of Rock Salt Solution Delivered (g) : .89 1.17 .786 Weight of AgNO3 Solution Delivered (g) : 1.53 .548 .786 Concentration of AgNO3 : 4.70e-4 (moles of AgNO3/g...
Saturday, October 4, 2014 at 5:46pm

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
Saturday, October 4, 2014 at 4:28pm

chemistry
separation techniquesfor silver chloride and sodium trioxonitrate(v).and properties of the three state of matter.
Saturday, October 4, 2014 at 2:17pm

chemistry
properties of the three state of matter.and seperation techique for silver chloride and sodium trioxonitrate(v)
Saturday, October 4, 2014 at 2:16pm

Chemistry
Use Lewis diagrams to show how electrons are shared to form covalent bonds in compounds with the following atoms. Write the formulas a) one carbon atom and four chlorine atoms i think i would share each of the four electrons of carbon with the chlorine atom
Saturday, October 4, 2014 at 1:53pm

chemistry
The following equation represents the partial combustion of methane, CH4. 2CH4(g) + 3O2(g) > 2CO(g) + 4H2O(g) At constant temperature and pressure, what is the maximum volume of carbon monoxide that can be obtained from 3.39 x 102 L of methane and 1.70 x 102 L of oxygen?
Saturday, October 4, 2014 at 12:08pm

chemistry
How many atoms of oxygen are in 1.5L of carbon dioxide, CO2? (assume STP conditions)
Saturday, October 4, 2014 at 10:41am

chemistry
8.10 g metal combines with 7.20g of oxygen to form X2O3. What is the relativ e mass of X
Saturday, October 4, 2014 at 5:13am

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
Saturday, October 4, 2014 at 12:51am

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
Saturday, October 4, 2014 at 12:02am

chemistry
Use activity coefficients to find the concentration of hydrogen ions in a solution of 90.0 mM butanoic acid and 0.05 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO– to be 500 pm. How do I calculate the ionic strength ...
Friday, October 3, 2014 at 11:13pm

chemistry
The rock in a lead ore deposit contains 84% PbS by mass. How many kilograms of the rock must be processed to obtain 2.3 kg of Pb? WebAssign will check your answer for the correct number of significant figures. kg
Friday, October 3, 2014 at 9:54pm

Chemistry
A buffer contains 0.50 mol CH3CO2H and 0.50 mol CH3CO2- diluted with water to 1.0 L. How many moles of NaOH are required to increase the pH of the buffer to 5.00? (pKa for CH3CO2H = 4.74)
Friday, October 3, 2014 at 9:26pm

chemistry
a.) Write the balanced complete combustion reaction for ethane (C2H6), producing CO2 and water vapour. Make sure to include phases. Also, make sure that the stoichiometric coefficients are whole numbers and are not fractions. b.) What is the enthalpy of reaction (ΔH°...
Friday, October 3, 2014 at 7:48pm

chemistry
what concentration of Br- results when 831 mL of 0.747 M HBr is mixed with 611 mL of 0.561 M FeBr2
Friday, October 3, 2014 at 7:45pm

chemistry
Gaseous methane CH4 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O . Suppose 0.481 g of methane is mixed with 2.9 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure ...
Friday, October 3, 2014 at 7:35pm

chemistry
The density of (Hg) is 13.53 g/mL. How many liters will 4.2x10^21 atoms of Hg occupy?
Friday, October 3, 2014 at 6:37pm

chemistry
what ions are present in AgNO2 + (NH4)SO4 I have Ag and N and H SO is a solid formed? no?
Friday, October 3, 2014 at 6:24pm

chemistry
Suppose you find chunk of what appears to be gold in the sand at the beach. devise a simple experiment to determine whether or no you're struck it rich. Please list all lab equipment required and list the specific steps you would take
Friday, October 3, 2014 at 4:36pm

chemistry
What is the maximum mass of TiCl4 that can be obtained from 79.0 g TiO2, 37.9 g Cl2 and excess carbon? Please show all your steps. 3 TiO2(s) + 6 Cl2 + 4 C(s) --> 3 TiCl4(g) + 2 CO2(g) + 2 CO(g) Molar Masses:TiO2-79.88, Cl2-70.90, TiCl4-189.68
Friday, October 3, 2014 at 4:09pm

Chemistry
What is the maximum mass of TiCl4 that can be obtained from 79.0 g TiO2, 37.9 g Cl2 and excess carbon? Please show all your steps. 3 TiO2(s) + 6 Cl2 + 4 C(s) --> 3 TiCl4(g) + 2 CO2(g) + 2 CO(g) Molar Masses:TiO2-79.88, Cl2-70.90, TiCl4-189.68
Friday, October 3, 2014 at 4:00pm

chemistry 101
What alcohol(s) could be used to produce each of the following compounds? Enter the IUPAC names of the alcohol(s). If there are more than one alcohol, enter them separated with commas. 1.CH3-CH2-O-CH2-CH3 2.CH3-CH2-C=CH-CH3 ..........| ..........CH3. 3.pentagon with a double ...
Friday, October 3, 2014 at 1:10pm

Chemistry
Potentiometric Acid-Base Titration: The tasks to be performed in Experiment #6 include: A. Preparation of a 0.05 M solution of sodium hydroxide (titrant solution). B. Standardization of the titrant solution. C. Calibration of the pH-meter. D. Determination of 2-acetoxybenzoic ...
Friday, October 3, 2014 at 11:46am

Chemistry
Explain the advantages of a potentiometric titration over titrations that use colored indicators.
Friday, October 3, 2014 at 11:43am

Chemistry
If we take 2.2 grams of CO2, 6.02 X 1021 atomes of nitrogen and 0.03 gram atoms of sulphar , then the molar ratio of C, N, and O is . answer is 5:1 :3 how to solve it help please , thanks
Friday, October 3, 2014 at 10:54am

Chemistry
Equal weights of methane and hydrogen are mixed in an empty container at 25 C. the fraction of total pressure exerted by the hydrogen is? answer is 1/9 i want to know that how to find out this answer thanks?
Friday, October 3, 2014 at 10:16am

Chemistry
Among the following electrons, which has highest energy? a. n = 3, l = 2, m = 0, s = + 1/2 b. n = 4, l = 0. m= 0 , s = - 1/s answer is A. but i want to know that how to get this answer help please?
Friday, October 3, 2014 at 10:14am

Chemistry
Nitrogen dioxide decomposes on heating according to the following equation 2NO2 (g) ↔ 2NO (g) + O2 (g) When 4 mole of nitrogen dioxide were put into a 1dm3 container and heated to a constant temperature, the equilibrium mixture contained 0.8 mole of oxygen. What is the ...
Friday, October 3, 2014 at 8:25am

.Chemistry Help please?
This type of question come in our exams usually that. If the Reaction P+Q → R + S is described as being of zero order with respect to P, it means that. Answer: THE RATE OF REACTION IS INDEPENDENT OF THE CONCENTRATION OF P. I want to ask that, what is such thing in this ...
Friday, October 3, 2014 at 7:01am

chemistry
state four differences between acid-base indicators and universal indicators
Friday, October 3, 2014 at 1:58am

Chemistry
Many important metals occur as sulfide, arsenide, and antimonide minerals, especially in the Sudbury mineral complex. The first step in processing these ores involves “roasting” the ore in air to produce the metal or metal oxide, along with nonmetal oxides that can ...
Thursday, October 2, 2014 at 11:31pm

chemistry
Light travels at the speed of3.0x10^10 cm/sec. what is the speed of light in feet per hour? I'm not sure on how to start it.
Thursday, October 2, 2014 at 10:45pm

Chemistry
Aluminum oxide is formed by reaction of excess oxygen with aluminum. 4 Al(s) + 3 O2(g) -> 2 Al2O3(s) Calculate the mass of aluminum required to form 18.2 kg of aluminum oxide if the reaction has a percent yield of 83.4%.
Thursday, October 2, 2014 at 10:19pm

chemistry
luminum oxide is an important starting material for making cryolite, Na3AlF6 (a compound used to give fireworks their yellow colour). First the aluminum oxide is synthesized from aluminum and then reacted with sodium hydroxide and hydrogen fluoride gas. If 2.6 Mg of aluminum ...
Thursday, October 2, 2014 at 10:19pm

Chemistry
Silver chromate may be prepared by the following reaction. 2 AgNO3(aq) + K2CrO4(aq)  Ag2CrO4(s) + 2 KNO3(aq) Calculate the mass of silver chromate produced when 0.623 L of 1.345 M silver nitrate is reacted with 245 mL of 1.89 M potassium chromate.
Thursday, October 2, 2014 at 10:15pm

Chemistry
Freon-12 is formed as follows: 3 CCl4 + 2 SbF3 -> 3 CCl2F2 + 2 SbCl3 150 g tetra chloromethane is combined with 100 g antimony (III) fluoride to give Freon-12 (CCl2F2). Identify the limiting and excess reagents, and calculate how many grams of Freon-12 can be formed.
Thursday, October 2, 2014 at 10:07pm

Chemistry
What amount of energy is required to melt a 27.4 g piece of ice at 0oC? The heat of fusion of ice = 333 Jg-1 Heat required to melt the ice 9.12e3 = J What amount of energy must be removed from 123 g of water to cool it from 71.6oC to 9.41oC? Specific heat of water = 4.184 JK-...
Thursday, October 2, 2014 at 9:28pm

chemistry
in an experiment, 24g of magnesium metal reacts with 73g of hydrogen chloride solution to produce hydrogen gas and 95g of magnesium chloride. Write the word, skeletal and balance eqautions
Thursday, October 2, 2014 at 8:18pm

Chemistry
What is the number of double or triple bonds in the formula C3H8? What is the number of lone pairs Around each atom? And what is the number of single covalent bonds? I also need help with the formula C3H6O with the same questions! For C3H8 I got 10 single covalent bonds. And ...
Thursday, October 2, 2014 at 6:38pm

chemistry, biotechnology
The question is: "The molar extinction coefficient of pure antibody is 1.4 absorbance units per milligram antibody @280nm. You have a concentrated antibody solution, so you make a 5-fold dilution and measure @280, getting an absorbance of 0.845. What is the concentration ...
Thursday, October 2, 2014 at 6:24pm

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