Chemistry

Chemistry
If we wish to find the molar mass of a pure solid organic compound, which measurement would be most useful and why? A)melting point of the solid B)melting point depression of the mixture of the solid with 1,4-dichlorobenzene C)Heat of combustion D)solubility in water

Chemistry
50 liters cylinder is filled with Ar gas to a pressure of 10130KPa at 30C. How many moles of At gas are in the cylinder

Chemistry
A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the precipitate(s) be?

chemistry
The electronic configuration of manganese is: 1s22s22p63d54s2. a)What is the maximum oxidation state of manganese? b)Explain how the electronic configuration shows that Mn is a transition element

chemistry
Between magnesium carbonate and calcium carbonate, which one is more thermally stable? Explain your answer.

chemistry
Between magnesium carbonate and calcium carbonate, which one is more thermally stable? Explain your answer.

chemistry
Why lattice energy of lithium chloride is more exothermic than that of sodium chloride.

chemistry
Write balanced equations to show the thermal decomposition of calcium nitrate and sodium nitrate.

chemistry
What is the energy of electron 4th exicted state of of be3+ ion if energy of electron in ground state

Chemistry
What makes the strongest cation in water? Al Na Fe K Mg I know that the OH^- ions from water are enough for the Al(OH)3 and Fe(OH)3 precipitates to appear and we've been taught that K,Na compounds are soluble in water too. And Mg(OH)2 needs a higher OH^- concentration to ...

Chemistry
Can we use O2 to identify NO and SO2 from each other? Is it because NO+O2-->NO2; NO2 - brownish gas and 2SO2+O2--2SO3;SO3-blue in colour? Or what is the reason?

Chemistry
Does SO2 also make Ca(OH)2 milk white in colour, like CO2?

Chemistry
What is basic like NaOH,from the following? 1)CH3NH2 2)(CH3)2NH 3)(CH3)3N 4)[N(CH3)4]^-(OH^-) 5) 2,4,6-aniline What is the reason?

chemistry
A BALANCED CHEMICAL EQUATION BTW IRON (Fe3+) and NaOH.

chemistry
what is diluted solution and concentrated solution?

Chemistry
What is the positive valence of Sodium Sulfate? (Na2SO4)?

Chemistry
Is thw positive valence of AlCl3 1 or 3 why?

chemistry
Which of the following would most likely act as a Bronsted-Lowry acid? OH- HCN CCl4 Mg(OH)+

chemistry
the important industrial process for producing ammonia (the Haber Process), the overall reaction is: N2(g) + 3H2(g) → 2NH3(g) + 100.4 kJ A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure. How many grams of N2 must react to form 1...

college subject=chemistry
Q#2..96g of sulphur reacts with 36g of carbon according to the following equation and produces carbon disulphide 2S + C = CS2 (a) the mass of carbon disulphide (b) the excess amount of the reagent in grams that is left unreacted.

chemistry
Q#2..96g of sulphur reacts with 36g of carbon according to the following equation and produces carbon disulphide 2S + C = CS2 (a) the mass of carbon disulphide (b) the excess amount of the reagent in grams that is left unreacted.

chemistry
1=what is the percntage yeild of carbon dioxide if 4 moles of octane are burnt to produce 1350g of carbon dioxide 2c8h18 + 25o2 = 16co2 + 18h2o

Chemistry
Calculate % of lowering of vapour pressure if 36 g glucose is added in 312g of benzene

Chemistry
We are asked to write the three products of the reaction between CH3COOH and NaHCO3(given one is a gas) They would be, 1)CH3COO^-(Na)^+ 2)CO2(g) And what would be the third product? As NaHCO3 is acidic would that be Na2CO3? Because CH3COO^-(Na)^+ is a weak acid salt and NaHCO3...

Chemistry
How do we order the following,considering their stability when they are in (+3) oxidation state? Al Ga Tl Sc We've been taught that (+3) is the common oxidation state of Sc. And when it comes to Al ,Ha,Tl how do we order them?

chemistry
How many numbers of molecules are contained in 24 litre ccl4? density of ccl4 = 1.59 gm

Chemistry
A 99.99% pure, 0.4903 g sample containing only carbon, hydrogen, and nitrogen is subjected to combustion analysis, resulting in the formation of 1.373 g CO2, 0.2791 g H2O, and 0.1860 g NO. What is the empirical formula of the sample?

Chemistry - Stoichiometry/gases
When 2.38 g of methane burns in oxygen, 119 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole of methane under these conditions? Your answer will be in kJ/mol. the Molar Mass of methane is 16.04, so I did 2.38g/16.04=0.14838 mol Then I did 119 kj/0....

chemistry
If a substance has a concentration of 85 mmol/L and gives 3 particles on ionization, what would be its concentration in milliosmoles per liter?

chemistry
2.3g hydrogen react with 29g of oxygen to form water what is the limiting reagent

Chemistry
Determine how many mL of 0.102 mol NaOH solution is needed to neutralize 35.0 mL of 0.125 mol H2SO4 solution.

Chemistry
48.0 mL of Ca(OH)2 solution was titrated with 19.2 mL of 0.385 mL mol HNO3. Determine the molarity of the Ca(OH)2 solution.

chemistry
You have made a buffer solution where you added 9 mL 1M Acetic Acid and 0.82 grams Sodium Acetate and diluted it with deionized water to 100 mL. If the Ka for Acetic Acid is 1.76*10-5 and the molecular weight of Sodium Acetate is 82.03 g/mole, what is the pH of the buffer you ...

Chemistry
Name the gas which reacts with lead acetate solution to turn black.

science chemistry
One word of the chemical used to dissolve gold in the leach tanks with the aid of oxygen

science chemistry
One word for the chemical used to dissolve gold in the leach tanks with the aid of oxygen

chemistry
what is electromagnetic radiation

chemistry
Which one of the two salts precipitated? AgNO3 + K2SO4 = Ag2SO4 + KNO3

Chemistry
We are asked to find the pH of a buffer solution of Dinitrophenol and NaOH,with the necessary data given. Do they react at 1:1 ratio? What would be the products?

Chemistry
The indicator HIn has a dissociation constant of 1*10^-4 M. HIn<===> H30^+ + In^- Yellow Red When the pH value of the solution is 7, 1)the indicator shows the colour red 2)at this time most of the indicator has been dissociated Which statements are true? 1)I took this as...

Chemistry
Can we consider two solutions of 10^-4 M NaOH and HCl ,as weak base and weak acid solutions?

Chemistry
If the percentage of water of crystallization in MgSO4.xH2O is 13% , then what is the value of 'X'.

Chemistry
If from 10 moles NH3 and 5 moles of H2S04,all the H-atoms are removed in order to form H2 gas,then find the number of H2 molecules formed.

Chemistry
According to the following reaction, how many grams of tetraphosphorus decaoxide are required for the complete reaction of 26.5 grams of perchloric acid (HClO4)? perchloric acid (HClO4) (aq) + tetraphosphorus decaoxide (s) ---> phosphoric acid (aq) + dichlorine heptaoxide (...

Chemistry
Classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds. CO2, HCl, Al2S3, Cd, F2,Ag,O2,NaCl

Chemistry
How are the three types of intermomecular forces similar? How are they different?

Chemistry
When diluting the commercial vinegar, what would have been the effect on acetic acid molairty of failing to rinse the pooped with commercial vinegar, assuming there was some distilled water left in the piper from a previous student? ( think about how the concentration of the ...

Chemistry
The density of palladium (Pd) is 12.0 g/mL and the cell volume is 5.89 ✕ 10^−23 mL. Determine the number of atoms in the unit cell. (Because there cannot be a part of an atom in a unit cell, we must round the number of atoms to the nearest whole number.)

Chemistry II
84.6g of NH3 are dissolved in 822g of water. What are the concentrations of this solution in mass percent and molality? Mass percent= 10.3% Molality = 6.05 Mol/kg

Chemistry
Calculate the moles of Carbon dioxide in 7.5×10 power 24?

chemistry
A single, neutral iodine atom has

Science-Chemistry(mole concept)
How many kg of wet NaOH containing 15% water are required to prepare 70 litre of 0.5N solution?

Chemistry
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? Luminol has a molecular weight of 177 g/mol.

chemistry
what volume of ammonia gas, measured at 647.5 mmHg and 36.1C is required to produce 6.53 g of ammonium sulfate according to the following. 2NH3+H2SO4-(NH4)2SO4

Chemistry
At 57.7°C, the vapor pressure of CCl4 is 56.1 kPa, and its enthalpy of vaporization is 29.82 kJ/mol. Use this information to estimate the normal boiling point (in °C) for CCl4.

Chemistry
What's the difference between the pressure of a system and the partial pressures in relation to Le Chatelier's principles? I know that when the pressure of the system is increased, it goes to the side with less moles/particles and when decreased it will go to the side with the...

chemistry
Explain how 0.25molar sodium trioxocarbonate4 can be prepared for practical use the ml is 500.

Chemistry
How many moles of Cu are required to produce 16.25 g of H2O

Chemistry
How many moles of Cu are required to produce 16.25 g of H2O

Chemistry
A current of 96.5 amperes is passed for 18 minutes between nickel electrodes in 500 ml solution of 0.2M nickel nitrate.the molarity of solution after electrolysis is

chemistry
Which of the following ions possess a dipole moment? (a) ClF2+ has a dipole moment has no dipole moment cannot be determined (b) ClF2− has a dipole moment has no dipole moment cannot be determined (c) IF4+ has a dipole moment has no dipole moment cannot be determined (d) IF4...

Chemistry
"For 4HCl + O2 <-> 2Cl2 + 2H2O : If in a container of 1.0 L we start with 2 moles of O2 and 4 moles of HCl, the molar fraction of O2 is: a) x/5 - x/2 b) 1-x / 6+x c) 5x / 5-x d) 1-x / 5-x e) 2x / 6-x " I tried solving this, but I wasn't sure if all 2 moles of O2 were ...

chemistry
According to the following chemical equation: N2 + 3H2 → 2NH3 How many grams of hydrogen are needed to completely react with 28.0 grams of nitrogen?

Chemistry
What should be the pH value of the solution to double the solubility of the ionic compound NX? Ka of HX=2*(10)^-5 M My thoughts on the question: Let the solubility of NX=x M 1) NX(s)<====> N+(aq) + X-(aq) eq:con: x x (moldm-3) X^-<===> HX + OH^- -->(2) HX<...

chemistry kinetics
The rate constant is numerically the same for three reactions of first ,second and third order resp. Which reaction should be the fastest and is this for all ranges of concentrations ??

Chemistry
If you add 13.75 mL of 1.35 M HCl to 22.80 mL of 0.955 M Ca(OH)2, will you neutralize all the Ca(OH)2? You must show data to support your answer.

Chemistry
If it takes 22.75 mL of 1.75 M H3PO4 to neutralize 14.90 mL of Al(OH)3, what is the molarity of the Al(OH)3?

Chemistry
If it takes 15.0 mL of 0.450 M HNO3 to neutralize 22.00 mL Cu(OH)2, what is the molarity of the Cu(OH)2?

Chemistry
How many mL of 1.20 M H2SO4 are needed to neutralize 18.75 mL of 0.843 M LiOH?

chemistry
If 19.7g of ALL, is actually produced, what is the percentage yield? 2Al+3I2 2 All3

chemistry
if you react 5.00g of aluminum with 20.0g of iodine, how much aluminum iodide do you expect to produce from this reaction? what is the limiting reactant ? what is the excess reactant? how much of the excess reactant do you expect to have left over?

science - chemistry
The relative molecular mass of calcium carbonate (CaCO3) is 100. What is the minimum volume of 2.0 M hydrochloric acid (HCl) that would be needed to completely react with 2.0 g of calcium carbonate?

Chemistry
If a strong acid or base is dissolved in water, will all of its parts have the concentration? For example in Ca(OH)2 = Ca + 2OH if the concentration of Ca(OH)2 is 8.11x10^-3 M, would the concentrations of Ca and 2OH be the same? or in the case of OH, the concentration has to ...

CHEMISTRY
if the degree of dissociation of one molar monoprotic acid is 10 percent. calculate its Ka value?

Chemistry
Excess lead (II) nitrate solution is added to 1.30 g of zinc powder and the mixture is stirred. When the reaction is finished the lead formed is filtered, dried and weighted. It has a mass of 3.31 g. What is the percentage yield of the lead? Pb(NO3)2 + Zn -> Pb + Zn(NO3)2 A...

Chemistry
The relative molecular mass of calcium carbonate is 100. What is the minimum volume of 2.0 M hydrochloric acid that would be needed to completely react with 2.0 g of calcium carbonate? options are A) 20 cm^3 B) 10 cm^3 C) 5 cm^3 D) 30 cm^3 E) 40 cm^3 I wrote down what I ...

Organic Chemistry
Does Ethanoyl Chloride gives out a white precipitate with aqueous AgNO3? We've been thought that an acid chloride gives out the relative Carboxylic acid with water.So in the same way can we take that Ethanoyl Chloride reacts with the water in this aqueous solution to give out ...

Chemistry
Calculate the delta G of the reaction using the following information. 4HNO3+ 5N2H4 --> 7N2+ 12H2O Delta H(Kj/mol) -133.9 50.6 0 -285.8 Delta S(J/mol x K) 266.9 121.2 191.6 70.0

Chemistry
How do we order the following considering their acidic nature? 1)CH3COOH 2)Phenol 3)C6H5COOH 4)CH3C(triple bond)CH 5)a cyclic alcohol [ (CH2)5-CH-OH ] I know that Phenol is acidic than alcohols and Carboxylic acids are acidic than alcohols and the alpha H in the third compound...

chemistry
What is the balanced chemical equation and ingredients for brufen when reacts with HCL in the stomach

chemistry to @DrBob222
What is the reason for considering N2 has a boiling point lower than O2,because of its low molecular mass. Just curious about that old reason...

Chemistry - thermochemistry
Hydrogen gas (H2) is generated by the following reaction. Ca(s) + 2 HCl(aq) → CaCl2(aq) + H2(g); ΔH = −542.7 kJ/mol When this reaction takes place in a cylinder (fitted with a piston) containing 1.000 mol Ca(s), 542.7 kJ heat is lost to the surroundings. Because a gas is ...

Chemistry
We have been thought that BaC2O4 is a precipitate when dissolved in H2O. When comparing its solubilty in water and in an aqueous acidic solution,what is the reason for its higher solubility in an aqueous acidic solution than water?

Science - chemistry
Write the complete ionic equation for the reaction of magnesium phosphate with lead (II) nitrate. Include which ions will be aqueous and which compound will precipitate. (Valences: Mg=+2, PO4=-3, Pb=+2, NO3=-1)

Chemistry
In a qualitative analysis, the test for the presence of Cu^2+ ion is the formation of the bright blue complex ion Cu(NH3)42+. What is the equilibrium concentration of Cu2+ when 1.0 mL of 0.200 M Cu^2+ is combined with 1.0 mL of 15.0 M NH3? (Kf Cu(NH3)4^2+ = 5.0 x 10^12).

chemistry
AsH3 is more acidic than NH3 explane

Chemistry
Why N2(g) has a lower boiling point?

Chemistry
Please tell me how many bonds are in cucl2.4h2o and in CuSO4.5h20 and how cu+2 forms bonds in orbitals 4s,3d with cl2,so4. also please tell me 4h2o and 5h2o attachment in orbitals.

chemistry
while chloromethane is reactive towards nucleophiles, the Grignard reagent produced from chloromethane is reactive towards electrophiles. pl explain

Chemistry
What volume of O2 gas at STP is required to burn 32g of methane gas completely?

chemistry
sodium chloride has a molar mass of 58.4g/mole. how many grams of sodium chloride are needed to make 500.mL of a 0.0250 molar solution?

Analytic Chemistry
Barium Sulfate precipitated from a 1.300 sample was contaminated with 9.4 mg of Fe2(SO4)3 and weighed a total of 314.0 mg. Calculate the apparent % BaSO4 and True % BaSO4

Chemistry
When 20.0mL of 1.40M solution of calcium nitrate is mixed with 70.0mL of 0.234M potassium iodate, a precipitate Ca (IO3)2 is formed. Calculate the concentrations of both NO3- and IO3- before mixing and after mixing

Chemistry
When calcium iodate is added to water at 25 degrees Celsius, the equilibrium concentration of calcium ion was found to be 0.011M. Calculate the value of Ksp for this salt.

chemistry
while chloromethane is reactive towards nucleophiles, the Grignard reagent produced from chloromethane is reactive towards electrophiles. explain pl.

chemistry
why is soap produced from olive oil relatively hard and insoluble?

Chemistry
Consider the Unbalanced Reaction: Al2O3(s) + CO(g) → Al(s) + CO2(g) Estimate ∆G at 298 K if 7.1 moles of Al2O3(s) is reacted.

Chemistry
Frequency(v)=5×10to the power9 c=3×10to the power8 Wave length=c/v . . =3×10 8 /5×10 9 . . =?????

Chemistry
If 18oo cal:of heat is added to a system while system does work equivalent to 2800 cal:by expanding against its surroundings. What is the value of deltaE for the system?

Chemistry PLEASE HELP ME
Would a precipitate form if 200 mL of 0.006 M AgNO3 were added to 700 mL of a 0.005 M solution of K2CO3?

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