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April 1, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry PLEASE HELP URGENT
Calculate the amount concentration of the cations in the following solutions: A) 0.5 mol/L sodium carbonate B) 0.2 mol/L ammonium sulfite C) 1.5 mol/L iron 3 sulfate
Thursday, January 8, 2015 at 8:23pm

chemistry
Calculate the mass of sodium phosphate required to prepare 1.75 L of solution in which the sodium ion concentration is 0.25 mol/L
Thursday, January 8, 2015 at 8:12pm

chemistry
What is the number of unpaired electrons for the following compounds: Cobalt (II) chloride Copper (II) chloride Iron (II) chloride Manganese (II) chloride Nickel (II) chloride Zinc chloride I don't know how to do this
Thursday, January 8, 2015 at 6:53pm

chemistry
Calculate the amount concentration of the ammonium ion in 100.0 ml of a solution containing 14.4 g of ammonium carbonate.
Thursday, January 8, 2015 at 5:44pm

Please Help Chemistry
Find the amount concentration of the anion in each of the following solutions: A) 0.50 mol/L barium chloride, BaCl2 B) 6.0 mol/L potassium hydroxide, KOH C) 0.10 mol/L aluminium chlorate, Al(ClO3)3
Thursday, January 8, 2015 at 5:26pm

Chemistry
In an experiment, you dissolve 0.30 g of KHP (MM = 204.22 g/mol) in 20 mL of DI water and titrate the sample with 0.10 M NaOH. Calculate the volume (to the nearest mL) of NaOH required to reach the equivalence point. IS it a) 3 b)15 c)20 d)30 e)100 I have done MV=MV (0.3/204....
Thursday, January 8, 2015 at 5:11pm

chemistry
I'm trying to find the weight of a lemon. Weight of container= 48 g Container + pure lemon juice = 184 g (100 ml) Pure lemon juice= 184g-48= 136g Does this make sense? Because I thought lemon had around the same density to water... wouldn't that mean my answer should ...
Thursday, January 8, 2015 at 5:08pm

chemistry
how could I figure out how many grams of pure lemon juice (squeezed from lemons) are in 100 ml?
Thursday, January 8, 2015 at 4:53pm

General Chemistry Project Ideas?
Hi I'm a high school science teacher and I teach General Chemistry when we learn how chemistry relates to our everyday lives. Right now were learning about some common compounds. I need projects ideas regarding some common compounds relating to their everyday lives.
Thursday, January 8, 2015 at 4:09pm

Chemistry
If 4.5 moles of elemental carbon react, what volume of carbon dioxide will be produced at STP?
Thursday, January 8, 2015 at 11:33am

Chemistry
How many moles of carbon are needed to react with 5.6 moles of hematite (Fe2O3)?
Thursday, January 8, 2015 at 11:33am

Chemistry
For each reaction, write the chemical formulae of the oxidized reactants in the space provided. Write the chemical formulae of the reduced reactants in the space provided. 2AgNO3 + Cu -> 2Ag + Cu(NO3)2 Reduced:Cu->Cu+ +1e- Oxidized: Ag+ + 1e- -> Ag ????????????????????
Thursday, January 8, 2015 at 11:29am

ap chemistry
what would have happened to your calculated molar mass if some lauric acid was spiled before finding the freezing point?
Thursday, January 8, 2015 at 11:12am

chemistry
Calculate the entropy increase in the evaporation of 1 mole of a liquid when it boils at 100 degree centigrade having heat of vaporisation at 100 degree as 540cals\gm
Wednesday, January 7, 2015 at 11:25pm

chemistry
Calculate the entropy increase in the evaporation of 1 mole of a liquid when it boils at 100 degree centigrade having heat of vaporisation at 100 degree as 540cals\gm
Wednesday, January 7, 2015 at 11:25pm

Chemistry
A solution is prepared by dissolving 10.8 g of ammonium nitrate in enough water to make 100.0 mL of solution. A 10.0 mL portion of this sample is diluted to 50.0 mL total volume. What is the molarity of the final solution?
Wednesday, January 7, 2015 at 8:18pm

Chemistry
If 3.79x1024 formula units (molecules) of hematite react with excess carbon, what mass of iron will be produced?
Wednesday, January 7, 2015 at 10:23am

chemistry
what is formula of pepsi?
Wednesday, January 7, 2015 at 8:46am

ap chemistry
a solution is prepared by dissolving 4.9 g C12H22 O11 (nonelectrolyte) in 175 grams of water. calculate the freezing poitn and osmotic pressure (25C) of this solution.
Wednesday, January 7, 2015 at 12:08am

chemistry
dissolved oxygen in aquatic systems is important for the survival of freshwater fish and they require a minimum of 5 parts per million(ppm) of dissolved oxygen (02) in a stream lake to survive. although this amount seems small, how many oxygen molecules are in a litre of water...
Tuesday, January 6, 2015 at 11:46pm

chemistry
a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O) WATER (PURE PRESSUR
Tuesday, January 6, 2015 at 11:26pm

chemistry
a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O) WATER (PURE PRESSUR
Tuesday, January 6, 2015 at 10:58pm

college chemistry
a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O) WATER (PURE PRESSUR
Tuesday, January 6, 2015 at 10:57pm

ap chemistry
a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O) WATER (PURE PRESSURE)
Tuesday, January 6, 2015 at 10:47pm

Chemistry
The heat of combustion of bituminous coal is 2.5 x 10^4 J/g. What quantity of coal is required to produce the energy required to convert 100. Pounds of ice at 0.0 degrees Celsius to steam at 100.0 degrees Celsius? Is the answer 5.36 about right. I'm not sure if I did it ...
Tuesday, January 6, 2015 at 10:13pm

Chemistry
Write a balanced Chem. Eq 1. Chlorine gas will react with aqueous sodium fluoride if 200J of energy is added and manganese is used as a catalyst. 2. Dinitrogen pentaoxide gas decomposes into its elemental parts.
Tuesday, January 6, 2015 at 9:38pm

CHEMISTRY-URGENT
A 4.43 gram sample of phosphorus was burned in air to produce 10.15 g of an oxide. What's the empirical formula of this compound?
Tuesday, January 6, 2015 at 9:37pm

Chemistry
Write a balanced equation Solid phosphorus (P) combusts with oxygen gas to form solid tetraphosphorus heptaoxide.
Tuesday, January 6, 2015 at 8:51pm

Chemistry
This is a longer assignment. I want you to confirm my first two answers and help me figure out the last. 3 Cu (s) + 8 HNO3 (aq) → 3 Cu(NO3)2 (aq) + 2 NO (g) + 4 H2O (l) A copper penny with a mass of 3.067 g is dissolved in 100.0 ml of 1.000 M nitric acid. A. How many ...
Tuesday, January 6, 2015 at 8:09pm

AP Chemistry
What is the value of w (work) when 1.3 moles of H2 expands from 25 liters to 50 liters against a constant external pressure of 1 atm, then expands further from 50 to 100 liters against a constant external pressure of 0.1 atm? Answer in calories. Answer in units of cal I know ...
Tuesday, January 6, 2015 at 8:05pm

chemistry
So I have to make a green cleaner for a project in chemistry. I think my ingredients should be: vinegar, salt, water, and lemon juice. But I don't know how I would write that exactly as a chemical formula. How could I write a chemical equation if I have 4 reactants? I can ...
Tuesday, January 6, 2015 at 7:15pm

ap chemistry
ap chemistry - an, Tuesday, January 6, 2015 at 12:59am HELP ME WITH THIS ONE WHEN DONE WITH THE OTHER THX calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? ...
Tuesday, January 6, 2015 at 12:59am

chemistry
a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl. help please 25g/58.44g NaCl=.428 mol 1000 grams of solvent H20 25g/58,...
Tuesday, January 6, 2015 at 12:47am

ap chemistry
calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve
Tuesday, January 6, 2015 at 12:20am

ap chemistry
calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve
Tuesday, January 6, 2015 at 12:13am

ap chemistry
calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve
Tuesday, January 6, 2015 at 12:12am

chemistry
calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve
Tuesday, January 6, 2015 at 12:00am

chemistry
a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl. whats wrong 25 g NaCl 1.0 L solution 1.0 g/mL 25 g NaCl/58.44 g NaCl...
Monday, January 5, 2015 at 11:57pm

college chemistry
a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.
Monday, January 5, 2015 at 11:48pm

ap chemistry
a solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). assuming that the volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.
Monday, January 5, 2015 at 11:46pm

chemistry
calculate the concentration of CO2, in a soft drink after the bottle is opened and equilibriates at 25C under a CO2 partial pressure of 0.0003 atm.
Monday, January 5, 2015 at 11:45pm

chemistry
a solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). assuming that the volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.
Monday, January 5, 2015 at 11:02pm

chemistry
A label on a soft drink bottle indicates that it contains 10% sugar w/vol. This means the sugar concentration is 10g/100ml. Given a teaspoon of sugar weighs 4g, calculate how many teaspoons of sugar you would consume if you drank a 600ml bottle of the soft drink.
Monday, January 5, 2015 at 10:55pm

Chemistry
The heat of combustion of bituminous coal is 2.5 x 10^4 J/g. What quantity of coal is required to produce the energy required to convert 100. Pounds of ice at 0.0 degrees Celsius to steam at 100.0 degrees Celsius?
Monday, January 5, 2015 at 10:53pm

chemistry
A label on a soft drink bottle indicates that it contains 10% sugar w/vol. This means the sugar concentration is 10g/100ml. Given a teaspoon of sugar you would consume if you drank a 600ml bottle of the soft drink.
Monday, January 5, 2015 at 10:38pm

chemistry
22.0 grams of zinc reacted with 95.0 mL of 0.5 Molarity HCl. What volume of hydrogen gas would be produced at 22 degrees C and 745 torr?
Monday, January 5, 2015 at 9:55pm

chemistry
Dissolved Oxygen in aquatic systems is important for the survival of small freshwater fish and they require a minimum amount of 5 parts per million of dissolved oxygen in a stream or lake to survive comfortably. Although this amount seems quite small, how many oxygen molecules...
Monday, January 5, 2015 at 8:38pm

chemistry
Hydrogen and oxygen gas combine explosively to produce water. Write a balanced chemical equation for this process. If 10 moles of hydrogen reacted with oxygen, what volume of liquid water could be produced?
Monday, January 5, 2015 at 8:35pm

chemistry
A recompression chamber with the dimensions of 3m x 3m x 2m is filled with a mixture of oxygen and nitrogen to relieve divers from the effects of the bends. What is the volume of the chamber in cm3?
Monday, January 5, 2015 at 8:33pm

chemistry
Find the mass of AlCl3 that is produced when 10.0 grams of Al2O3 react with 25.0 g of HCl according to the following equation. Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(aq) 65.4 g help me ASAP.PLIS..
Monday, January 5, 2015 at 7:31pm

AP Chemistry
Calculate the moles of CO2 formed when 4.2 mol of C3H8 react with 20.6 mol O2. Answer in units of mol. So, the balanced equation is C3H8 + 5 O2 ==> 3 CO2 + 4 H2O . I thought the answer would be 12.36 mol, but when I type it in it's wrong. Please help!
Monday, January 5, 2015 at 6:46pm

chemistry
Ravi prepared a solution of sodium chloride by mixing 5.85g of salt in 1 liter of water. a)find molar mass of sodium chloride b)find number of moles of sodium chloride dissolved.
Monday, January 5, 2015 at 1:38pm

Chemistry
How would you determine if a given compound is acidic, basic or neutral? Also if given a compound, how would you determine if the state is aqueous (without a chart)?
Sunday, January 4, 2015 at 11:15pm

chemistry
So I did a titration lab at school with NaOH and HCl. i have to find: - volume used, NaOH - Moles of NaOH - Moles of HCl -Volume used unknown HCl - Molarity of HCl solution My concentration of NaOH stock solution was 0.100 mol/lL Final buret reading, NaOH: 14.20 ml Initial ...
Sunday, January 4, 2015 at 10:42am

chemistry
•Which of the following solutions will be the best buffer at a pH of 9.26? (Ka for HC2H3O2 is 1.8 x 10–5; Kb for NH3 is 1.8 x 10–5.) a)0.20 M HC2H3O2 and 0.20 M NaC2H3O2 b)3.0 M HC2H3O2 and 3.0 M NH4Cl c)0.20 M NH3 and 0.20 M NH4Cl d)3.0 M NH3 and 3.0 M NH4Cl e)...
Sunday, January 4, 2015 at 7:47am

chemistry
what is the volume, in liter of 2.54 mol methane (ch4) gas? I've been stuck on this problem for hours, someone please help!
Sunday, January 4, 2015 at 2:36am

Chemistry
Can someone please help me determine the mass of 1.45 mol FePO4?
Sunday, January 4, 2015 at 2:35am

Chemistry
Calculate the number of atoms in 2.58 mol antimony. Its an example problem, I need help!
Sunday, January 4, 2015 at 2:34am

AP Chemistry
A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are neutralized by adding ...
Saturday, January 3, 2015 at 5:06pm

Chemistry
find the gram formula mass for the following: 1) In2(S2O3)3 2) Np 3) Re3(PO4)7
Friday, January 2, 2015 at 4:55pm

AP Chemistry
A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are neutralized by adding ...
Friday, January 2, 2015 at 12:06pm

chemistry
If we take 100m/l of water how many prectange of methane disolve in water ?
Friday, January 2, 2015 at 3:14am

AP Chemistry
Consider the following reaction: CH3X + Y --> CH3Y + X At 25 degrees Celcius the following two experiments were run, yielding the following data: Experiment 1: [Y]0 = 3.0 M [CH3X] (mol/L) Time (hours) 7.08*10^-3 1.0 4.52*10^-3 1.5 2.23*10^-3 2.3 4.76*10^-4 4.0 8.44*10^-5 5....
Thursday, January 1, 2015 at 7:14pm

chemistry
what is the ph of the resulting mixture when 10.00ml of 0.400 mol/l KOH is added to 15.00 ml of 0.300 mol/l acetic acid?
Thursday, January 1, 2015 at 4:40pm

chemistry
a 2.00l buffer contains 1.00 mol HNO3 mixed with 1.00mol NaNO2 a. write the relevant ionization equation for this buffer. b. determine its pH c. determine the new pH if 1.00g of NaOH is added to the buffer
Thursday, January 1, 2015 at 4:39pm

chemistry
Acetylene(C2H2), an important fuel in welding, is produced in the laboratory when calcium carbide (CaC2) reacts with water: CaC2(s) + 2H20(l) → C2H2(g) + Ca(OH)2(aq) For a sample of acetylene collected over water, total gas pressure (adjusted to barometric pressure) is ...
Thursday, January 1, 2015 at 9:05am

chemistry
calculate the volume of O2 at STP for the complete combustion of two moles of carbon disulphide which produces CO2 and SO2.
Wednesday, December 31, 2014 at 10:34pm

chemistry
300 ml of a gas at 27oC is cooled to 3oC at constant pressure.its final volume is? [please explain clearly]
Wednesday, December 31, 2014 at 10:31pm

AP Chemistry
If a saturated solution of Potassium Chlorate at 80 degrees celsius cools to room temperature (25 degrees celsius), how many grams of crystals form?
Wednesday, December 31, 2014 at 4:26pm

Chemistry
A sample of gas (2.0 mmol) effused through a pinhole in 5.0 s. It will take __________ s for the same amount of to effuse under the same conditions.
Wednesday, December 31, 2014 at 3:17pm

chemistry
When 85g of CH4 are mixed with 160g of O2 what is the maximum amount of CO2 that can be produced? plis help me ASAP
Wednesday, December 31, 2014 at 7:42am

Chemistry
A solution of 10g of a nonvolatile compound in 25g of water boils at 100.78C at 1 atm. What is the molecular mass of the solute?
Wednesday, December 31, 2014 at 6:58am

Chemistry
What is the freezing point of a 10% (by mass) solution of CH3OH in water?
Wednesday, December 31, 2014 at 6:40am

Chemistry
How much ethyl alcohol, C2H5OH must be added to 500mL of water so that the solution will freeze at -10C? KfH2O = 1.86 C/molal
Wednesday, December 31, 2014 at 6:02am

Chemistry
What is the boiling point of a solution that contains 1.20 mole of sodium chloride in 1000 g water? KbH2O = 0.512C/ molal
Wednesday, December 31, 2014 at 5:58am

Applied Chemistry Project Help!!!
Research and describe one current application of the knowledge of the atom. This application can be in any field of your choice. This means the field can be scientific, such as medicine, or nonscientific, such as entertainment. The purpose of this assignment is to learn the ...
Tuesday, December 30, 2014 at 9:46pm

Chemistry***
A mixture containing 19.8 moles of H2 and 7.2 mole of I2 was allowed to reach equilibrium in a 5 L closed vessel at ToC according to the equation: H2 (g) + I2 (g) 2HI (g) At equilibrium, 14 moles of H2 was present. The equilibrium constant for this reaction is denoted as Kc(1...
Tuesday, December 30, 2014 at 6:39pm

chemistry
Mg + O2 ------> MgO if 1.00 g of magnesium is ignited in a flask containing 0.500liters of oxygen at STP, how many grams of magnesium oxide areproduced? what is the name and the amount of the reactant inexcess? My work: 1g Mg/24.3g=0.041 mol Mg; 0.5L O2/22.4L=0.022 mol O2; ...
Tuesday, December 30, 2014 at 6:37pm

chemistry
forums.studentdoctor.n et/thr eads/equilibrium-calculation.1113998/ Please to delete space
Tuesday, December 30, 2014 at 11:28am

chemistry
a 2.00l buffer contains 1.00 mol HNO3 mixed with 1.00mol NaNO2 a. write the relevant ionization equation for this buffer. b. determine its pH c. determine the new pH if 1.00g of NaOH is added to the buffer.
Monday, December 29, 2014 at 5:16pm

chemistry
what is the ph of a buffer made by mixing 2.00g of sodium acetate with 20.00ml of 1.20 mol/l acetic acid and adding enough water so the final volume of the mixture is 100.0 ml?
Monday, December 29, 2014 at 5:13pm

chemistry
A gas storage tank has a small leak the pressure in the tank drops more quickly if the gas is hydrogen than oxygen. Why?
Monday, December 29, 2014 at 1:08pm

General Chemistry!!!!
Hi I'm a high school teacher. I teach General Chemistry. I'm looking for a textbook for my student. In this course we learn the basics of chemistry and how it relates to our everyday lives/world.
Monday, December 29, 2014 at 12:20pm

chemistry
On heating 4 moles of pcl5 in cointainer 60percent of equlibrium then find the capacity of vessel
Saturday, December 27, 2014 at 9:28am

chemistry
Which alkyl halide should be used to prepare pent-2-ene and why?
Thursday, December 25, 2014 at 2:02pm

Chemistry
What are the different ways to split a mixture of benzene and methanol into its constituents using a 2 phase system separation ?
Thursday, December 25, 2014 at 6:09am

Chemistry
The plutonium phase diagram is shown below. Solid phases A, B, C, D, E, F, and G are present under various condition of temperature and pressure. Consider increasing the pressure on a plutonium sample at 560 K from P1 to P2. Are phases D, F, and G ever simultaneously together ...
Monday, December 22, 2014 at 10:10pm

Chemistry
A saturated solution is prepared by adding excess PbI2(s) to distilled water to form 1.0L of solution at 25oC. The concentration of Pb+2 in the saturated solution is found to be 1.3*10-3 M. Calculate the Ksp for PbI2(s) in water at 25 °C R/ Kps=[Pb^2+][I^-1]^2, where, [I^-...
Monday, December 22, 2014 at 9:59pm

Chemistry
Comment on the solubility of the following liquids. State whether at room temperature you expect the components to be highly soluble or almost insoluble, and choose the appropriate reasons why. HINT: It may behoove you to draw the Lewis structure for each molecule. (A) H2 in ...
Monday, December 22, 2014 at 9:00pm

Chemistry
Calculate the planar packing fraction (fractional area occupied by atoms) of the (110) plane of aluminum at 300K 0.554 atm/cm Calculate the linear packing density (atoms/m) in the [100] direction of Al at 300K. 2.47⋅10^9 m
Monday, December 22, 2014 at 8:30pm

Chemistry
A material exhibits an optical band edge at ν=5∗1014 Hz (s-1). a) What is the band edge (in eV) of this material? Answer:2.07; E=hc Above what wavelength do you expect the material to be transparent? Express your answer in nm. Answer: 599.6: landa= C/V y pasa a ...
Monday, December 22, 2014 at 7:26pm

Chemistry
Consider the molecules ether (CH3OCH3), ethyl alcohol (CH3CH2OH), and propanol (CH3CH2CH2OH) (not isopropanol!). The boiling point of ether is -25 degrees while the boiling point of ethyl alcohol is 78 degrees. How would you explain the difference in properties of the two ...
Monday, December 22, 2014 at 5:57pm

chemistry
40 ml of carbon dioxide was collected and is at 10 degree celsius and at 740 mm pressure.Calculate its volume at STP.
Monday, December 22, 2014 at 9:18am

chemistry
how many moles of cao are needed to react with excess water to produce 370 grams of calcium hydroxide
Monday, December 22, 2014 at 4:19am

Chemistry!
Liquid A has vapor pressure X, and liquid B has vapor pressure Y. What is the mole fraction of the liquid mixture if the vapor above the solution is 30% A by moles? 50% A? 80% A? (calculate in terms of x and y) I'm a little bit confused because I thought the mole fraction ...
Sunday, December 21, 2014 at 11:39pm

Chemistry
what are the intermolecular forces present in: 1. n-propyl alcohol 2. n-butanol 3. 2-butanol 4. tert-butanol alcohol 5. pentane 6. hexanes I know that the forces include- dipole-dipole, ion-dipole, dispersion, and hydrogen bonding...but I don't know how to pick which one ...
Sunday, December 21, 2014 at 6:07pm

chemistry
what volume of hydrogen will be produced if 100cm3 of ammonia is completely decomposed at constant temperature and pressure.
Sunday, December 21, 2014 at 12:58pm

chemistry
In the determination of the molar mass of a volatile liguid a 250ml flask was found to contain 0.250g of the vapor measured at 273c and 760 mmhg pressure. The molar mass is nearest the value
Sunday, December 21, 2014 at 11:01am

chemistry
A sample of co2 occupies 6.00l at 25c and 700. MmHg. What is the volume of the gas at stp
Sunday, December 21, 2014 at 10:55am

chemistry
When 40.2g of kc103 is heated what quantity of kc1 is produced
Sunday, December 21, 2014 at 10:51am

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