Thursday
May 26, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
Precipitation of Ni2+ from a 25 mL aliquot of a solution of unknown concentration yielded 0.338 g of Ni(DMGH)2. Calculate the concentration of the Ni2+ solution
Thursday, November 5, 2015 by Anonymous

f.s.t.c y
(chemistry) 23g of ethanol was mixed with 72g of water in a reaction vessel.calculate the mole fraction and mole percent of water.calculate the mole fraction and mole percent of ethanol
Thursday, November 5, 2015 by shazali

chemistry
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of the excess reactant remain if 2.00 moles of H2O(l) and 5.00 moles of NO2(g) are used? Question 30 options: 1.67 mol H2O(l) 3.00 mol NO2(g) 4.00 mol NO2(g) 1.00 mol NO2(g) 0.33 mol H2O(l)
Thursday, November 5, 2015 by beverly

chemistry
How many moles of carbon monoxide gas are produced from the reaction of 5.00 moles of SnO2(s) with 9.00 moles of carbon according to the equation below? SnO2(s) + 2C(s) → Sn(s) + 2CO(g) Question 28 options: 4.50 mol 9.00 mol 18.0 mol 5.00 mol 7.50 mol
Thursday, November 5, 2015 by beverly

chemistry
How many moles of nitric acid are produced starting from 5.00 moles of NO2(g) and 2.00 moles of water? Question 29 options: 4.00 mol 1.67 mol 7.50 mol 3.33 mol 10.0 mol
Thursday, November 5, 2015 by beverly

chemistry
How many moles of carbon monoxide gas are produced from the reaction of 5.00 moles of SnO2(s) with 9.00 moles of carbon according to the equation below? SnO2(s) + 2C(s) → Sn(s) + 2CO(g) Question 28 options: 4.50 mol 9.00 mol 18.0 mol 5.00 mol 7.50 mol
Thursday, November 5, 2015 by beverly

chemistry
5NaN3(s) + NaNO3(aq) → 3Na2O(s) + 8N2(g) If 1.50 g of N2(g) are produced, how many grams of Na2O(s) are also produced? Question 26 options: 8.85 g 3.32 g 2.05 g 2.22 g 1.24 g
Thursday, November 5, 2015 by beverly

chemistry
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of NO2(g) are required to react with 1.00 mole of water to produce 3.00 moles of nitric acid? Question 24 options: 6.00 mol 1.50 mol 2.00 mol Not enough water is available to produce 3.00 moles of nitric acid. 4.50 mo
Thursday, November 5, 2015 by beverly

chemistry
5NaN3(s) + NaNO3(aq) → 3Na2O(s) + 8N2(g) If 1.50 g of N2(g) are produced, how many grams of Na2O(s) are also produced? Question 26 options: 8.85 g 3.32 g 2.05 g 2.22 g 1.24
Thursday, November 5, 2015 by beverly

Chemistry
Solve with half equation reaction SO3 2- + MnO4 -=SO4 2- + Mn2+
Thursday, November 5, 2015 by Kabih kush

chemistry
How many oxygen atoms are present in 2.00 millimoles of H2SO4?
Thursday, November 5, 2015 by beverly

chemistry
Copper(II) nitrate decomposes upon heating to form copper(II) oxide, nitrogen dioxide gas, and oxygen gas. If 1.0 mole of copper(II) nitrate decomposes, how many moles of nitrogen dioxide would be formed?
Thursday, November 5, 2015 by beverly

chemistry
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of nitric acid are produced starting from 5.00 moles of NO2(g) and excess water?
Thursday, November 5, 2015 by beverly

chemistry
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of NO2(g) are required to react with 1.00 mole of water to produce 3.00 moles of nitric acid?
Thursday, November 5, 2015 by beverly

Chemistry
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 × 10-34 joule seconds, the speed of light is 2.998 × 108 m/s)
Thursday, November 5, 2015 by 007

chemistry
Initially a vessel is charged at 1000K with SO3 at a partial pressure of 0.5atm. At equilibrium the SO3 partial pressure is 0.2atm. Calculate the value of Kp at 1000K. 2SO3->2SO2+O2 My answer: 0.5-0.2=0.3atm SO2=0.3atm*2/2mol= 0.3 O2=0.3atm*1/2mol=0.8 Therefore 0.8-0.3=0.5 ...
Thursday, November 5, 2015 by aadilah

chemistry
To a 100.0 mL solution containing 0.0100 M Ba(NO3)2 and 0.0100 M Pb(NO3)2 was added 101.0 mL of 0.0100 M H2SO4 to provide a slight excess of SO42- relative to Ba2+ in the resulting solution. Assuming that: i) H+ does not bind to SO42- ii) ionic strength effects can be ignored ...
Wednesday, November 4, 2015 by john

Chemistry
A change cannot occur spontaneously if it is accompanied by: A. An energy decrease and an increase in randomness. B. An energy increase and an increase in randomness. C. An energy decrease and a decrease in randomness. D. An energy increase and a decrease in randomness. E. A ...
Wednesday, November 4, 2015 by Anonymous

chemistry
what is the connection between periodic trends and relative reactivity?
Wednesday, November 4, 2015 by XOXOX

chemistry
what is the mass of bromine contains the same number of atoms of 50.0 g of iodine? my work: 50g/79.5g= .628 mol(Br) 50g/126g=.394 mol(I)
Wednesday, November 4, 2015 by fatima

Chemistry
what is the wave length and type of light released when an electron absorbs 3.03 x10 -19 j of energy
Wednesday, November 4, 2015 by Jonathan

chemistry
Initially a vessel is charged at 1000K with SO3 at a partial pressure of 0.5atm. At equilibrium the SO3 partial pressure is 0.2atm. Calculate the value of Kp at 1000K. 2SO3->2SO2+O2 My answer: 0.5-0.2=0.3atm SO2=0.3atm*2/2mol= 0.3 O2=0.3atm*1/2mol=0.8 Therefore 0.8-0.3=0.5 ...
Wednesday, November 4, 2015 by aadilah

chemistry
A 0.1028 g impure sample consists of Na2CO3 was analyzed by the Volhard method. After adding 50.00 mL of 0.06208 M AgNO3, the sample was back titrated with 0.06261 M KSCN, requiring 28.36 mL to reach the end point. Report the purity of the Na2CO3 sample
Wednesday, November 4, 2015 by yun

Chemistry
Determine ∆G° (in kcal) for the reaction CCl4(ℓ) + H2(g) HCl(g) + CHCl3(ℓ) at 25 °C under standard conditions. The following information is available: At 25 °C C(graphite) + 2Cl2(g) CCl4(ℓ) ∆S° = -56.23 cal K-1 C(graphite) + Cl2(g...
Wednesday, November 4, 2015 by Anonymous

Chemistry
If 0.400ml CH3CO2H and 0.200ml of 0.100M NACH3COO What is the pH of the resulting solution.
Wednesday, November 4, 2015 by Buffy

Chemistry
The air was in a cylinder equipped with the piston absorbs 565 duels of heat and expands from an initial volume of .10 l to a final volume of .85 L against an external pressure of 1.0 ATM what is the change an internal energy of the air within the cylinder
Wednesday, November 4, 2015 by Daisy

chemistry
calculate the mass in grams of copper that will be deposited by dissolving 6.5g of zinc in copper tetraoxosulphate(vi)solution
Wednesday, November 4, 2015 by kabiru ali

Chemistry VERY URGENT PLEASE
A) NaOH(s) > NaOH(aq) B) NaOH(s) + HCl(aq) > NaCl(aq) + H2O(l) C) NaOH(aq) + HCl(aq) > NaCl(aq) + H2O(l) Examine the 3 reaction equations, and determine the relationship between them. Demonstrate this relationship by combining the equations in a manner consistent with...
Tuesday, November 3, 2015 by Finn

Chemistry (Check)
How many grams of NaOH are in 500mL of a 0.50 M solution? 500mL=.5L MM NaOH = 39.99711g M x V = n 0.5 x 0.5 = .25moleNaOH .25moleNaOH x (39.99711gNaOH / 1moleNaOH) = 10.gNaOH Is this right? If not, please tell me what I did wrong.
Tuesday, November 3, 2015 by Anonymous

Chemistry
Describe how you would prepare 500 mL of a 0.10 M solution of HCl from a 12.0 M solution of HCl.
Tuesday, November 3, 2015 by Sarah

Chemistry (Help)
0.275gAgNO3 is dissolved in 500mL of solution. a. What is the molarity of this solution. b. If 10.0 mL of this solution are transferred to a flask and diluted to 500mL, what is the concentration of the resulting solution? c. If 10.0mL of the solution in (b) are transferred to ...
Tuesday, November 3, 2015 by Anonymous

Chemistry.
Mg+2HCl--->MgCl2+H2 Using the balanced equation, how many moles of H2 will you make if you start with .00082 moles of Mg solid? How many grams of H2 is that?
Tuesday, November 3, 2015 by Sarah

Chemistry (Check and Help)
Which is more concentrated, 500mL of a .20M solution of NaCl or 250mL of a .25M solution of NaCl? MMNaCl = 58.44247 M x V = n .5L x .2M = .1moleNaCl .1moleNaCl x (58.44247gNaCl / 1moleNaCl) = 6gNaCl .25L x .25M = .0625moleNaCl .0625moleNaCl x (58.44247gNaCl / 1moleNaCl) = 3....
Tuesday, November 3, 2015 by Anonymous

Chemistry (Check)
How many grams of NaOH are in 500 mLm of a 0.50M solution? 500mL --> .5L MM NaOH = 39.997g M x V = n .5 x .5 = .25moleNaOH .25moleNaOH x (39.99711gNaOH / 1moleNaOH) = 10.gNaOH Is this right? If not, what am I doing wrong?
Tuesday, November 3, 2015 by Anonymous

chemistry
In the industrial preparation of HNO3, NH3 is burnt in O2 in the presence of a catalyst, according to the following equation; 4NH3 + 502 - 4NO +6HO If 260ccm3 of NH3 is burnt completely. what volume of O2 is used up and NO is produced
Tuesday, November 3, 2015 by Precious

Chemistry
In a titration of 35 mL of 0.40 M H3PO4 with 0.30 M KOH solution, what volume (in mL) of KOH solution is needed to reach the last equivalence point (i.e., point in the titration where enough KOH has been added to neutralize all three of the acidic protons in the phosphoric acid)?
Tuesday, November 3, 2015 by Anonymous

Chemistry
In a titration of 35 mL of 0.40 M H3PO4 with 0.30 M KOH solution, what volume (in mL) of KOH solution is needed to reach the last equivalence point (i.e., point in the titration where enough KOH has been added to neutralize all three of the acidic protons in the phosphoric acid)?
Tuesday, November 3, 2015 by Anonymous

chemistry
C3H6O + 4O2 --> 3CO2(g) + 3H2O(g) deltaH= -1790kJ the density of C3H6O is 0.79g/mL. HOw much heat is released by the combustion of 150mL of acetone?
Tuesday, November 3, 2015 by Melanie

AP Chemistry
At 25 degrees C, a sample of NH3( molar mass 17 g) effuses at the rate of .050 mole per minute. Under the same conditions, which of the following gases effuses at approxiomatesly half that rate? A- O2 B- He2 C-CO2 D-CI2 E-CH4
Tuesday, November 3, 2015 by Anonymous

Chemistry (Check)
PF3 reacts with XeF4 to give PF5 2PF3(g) + XeF4(s) --> 2PF5(g) + Xe(g) How many moles of PF5 can be produced from 100.0 grams of PF3 and 50.0 grams of XeF4? 100.0gPF3 x (1molePF3 / 87.96896gPF3) x (2molesPF5 / 2molesPF3) = 1.14molesPF5 50.0gXeF4 x (1moleXeF4 / 207.2836gPF3...
Tuesday, November 3, 2015 by Anonymous

Chemistry
The thermite reaction, used to weld rails together in the building of railroads, is described by the following equation. Fe2O3(s) + 2Al(s) --> Al2O3(s) + 2Fe(l) Calculate the mass of iron metal that can be prepared from 150 grams of aluminum and 250 grams of iron (III) ...
Tuesday, November 3, 2015 by Anonymous

Chemistry - Acid and Bases
In aqueous solution, classify these compounds as strong acids, weak acids, strong bases, weak bases, or other. HNO3 HBr HF CH3COOH H3PO4 NaOH Ba(OH)2 (CH3)3N NH3 NaCl
Monday, November 2, 2015 by Anonymous

CHEMISTRY!!
For the diprotic weak acid H2A, Ka1 = 2.0 × 10^-6 and Ka2 = 6.7 × 10^-9. What is the pH of a 0.0800 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?
Monday, November 2, 2015 by GARRETT

Chemistry
How much carbon dioxide is produced upon the complete combustion of 17.3L of propane (approximately content of one 5-gal tank)? Assume that the density of the liquid propane in the tank is 0.621 g/mL. Can you please list the steps! I am really confused! I tried many ways but I...
Monday, November 2, 2015 by Maira

chemistry
if 40g of KNO3 is dissolved in 100ml water at 25 C WHAT WILL FINAL TEMP BE? SHOW ALL WORK
Monday, November 2, 2015 by sara

Chemistry
H3PO4(aq) + 3 KOH(aq) → K3PO4(aq) + 3 H2O(l) How many grams of potassium hydroxide are required to completely neutralize 3.23 grams of phosphoric acid?
Monday, November 2, 2015 by ...

Chemistry
Determine the number of grams of water in 7.00 g of copper(II) sulfate pentahydrate.
Monday, November 2, 2015 by Liz

Chemistry
A hypothetical covalent molecule, X–Y, has a dipole moment of 1.62 D and a bond length of 179 pm. Calculate the partial charge on a pole of this molecule in terms of e (where e is the charge on an electron).
Monday, November 2, 2015 by Jordann

Chemistry (Help)
For the chemical reaction, sodium hydroxide + copper (II) chloride = "robin's egg blue" precipitate, do the following: write the balanced molecular, balanced total ionic, and balanced net ionic equations; determine the Limiting Reactant (LR) for each chemical ...
Monday, November 2, 2015 by Anonymous

Chemistry (Check and Help)
Upon the combustion of propane, C3H8, 150. g of propane was reacted with excess oxygen gas. A. Determine the limiting reactant if the water is the product of interest. B. Determine the number of grams of water produced. C. Calculate the number of grams of water obtained in the...
Monday, November 2, 2015 by Anonymous

Chemistry (Check and Help)
Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount in grams of excess reagent. 8.75 g of mercury (II) nitrate solution is mixed with 9.83 g sodium iodide solution (ppt). Hg(NO3)2(aq) + 2NaI(aq) --> ...
Monday, November 2, 2015 by Anonymous

Chemistry (Check and Help)
Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount in grams of excess reagent. 6.95 moles of glucose C6H12O6(s) is combusted with 7.54 moles of O2 gas (both products!) C6H12O6(s) + 6O2(g) --> 6CO2(g...
Monday, November 2, 2015 by Anonymous

Chemistry (Check)
Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount in grams of excess reagent. Calcium nitrate is decomposed with heat to give calcium nitrite and oxygen gas. Start with 15.99g of calcium nitrate. Ca(NO3...
Monday, November 2, 2015 by Anonymous

Chemistry
Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount of grams of excess reagent. Chromium metal is heated with oxygen to give chromium (III) oxide. Start with 38.5 moles chromium metal and unlimited oxygen...
Monday, November 2, 2015 by Anonymous

Chemistry
Calculate the work, in kJ, done when 126 g of tin dissolves in excess acid at 25.0˚C and 1.00 atm. Assume Ideal Gas behavior. Sn(s) + 2 H+(aq) → Sn2+(aq) + H2(g) I basically need to know how to find the change in volume since work=-pressure*volume change and I have ...
Monday, November 2, 2015 by Carol

Chemistry
How much heat (in kilojoules) is released on reaction of 5.30 g of Al?
Sunday, November 1, 2015 by Donny

Chemistry
Pb + S yield FeS
Sunday, November 1, 2015 by D

Chemistry
3.90g sample of Al with an unknown initial temperature is dropped into 10 mg of water at 22.6 degrees Celsius. What will teh change in temperature be of the Al if its final temperature is 28.6 degrees Celsius?
Sunday, November 1, 2015 by Connor

cheMistry
a) Silver iodide(s) is formed by the following reaction: Ag (aq) + I (aq) --> AgI (s) The Ksp for AgI = 1.8 x 10^-10 Describe, using the chemical reaction, the mathematical formula for these ions. Assuming these ion concentrations are equal, what would the molarity be for ...
Sunday, November 1, 2015 by hank

Chemistry
Ca(OH)2+Na2CO3> 2NaOH + CaCO3 50g hydroxide and 50g sodium carbonate are reacted. How many grams sodium hydroxide will be made?
Sunday, November 1, 2015 by Ashley

Chemistry
Suppose that 120 g of ethanol at 24◦C is mixed with 275 g of ethanol at 81◦C at constant atmospheric pressure in a thermally insulated vessel. What is the ∆Ssys for the process? The specific heat capacity for ethanol is 2.42J/g K. Answer in units of J/K. Can ...
Sunday, November 1, 2015 by Alexis

Chemistry
The heat of neutralization of HCl(aq) and NaOH(aq) is -55.90 kJ/mol of water produced. If 50.00 mL of 1.16 M NaOH at 25.15 ºC is added to 25.00 mL of 1.79 M HCl at 26.34 ºC in a plastic-foam cup calorimeter, what willthe solution temperature be immediately after the ...
Sunday, November 1, 2015 by Alexis

Chemistry
How do you find the Ka1 and Ka2 of oxalic acid when it is in a solution that is 1.05 M H2C2O4 and has a pH of 0.67. [C2O4^2-] = 5.3x10^-5 M. I have tried using an ICE table for both reactions, as oxalic acid is a diprotic acid, but I am having trouble knowing where to put ...
Sunday, November 1, 2015 by Erika

Chemistry
An experiment requires 0.34 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.34 M base?
Sunday, November 1, 2015 by Liz

chemistry
How much does the molar enthalpy change when 147g of water cools from 90°C to 17.0°C? The molar heat capacity for water is 75.3 j/k•mol
Sunday, November 1, 2015 by Gino

Chemistry
For the chemical reaction, sodium hydroxide + copper (II) chloride = "robin's egg blue" precipitate, do the following: write the balanced molecular, balanced total ionic, and balanced net ionic equations; determine the Limiting Reactant (LR) for each chemical ...
Sunday, November 1, 2015 by Anonymous

Chemistry
Dissolving calcium hydroxide (∆Hsoln = -16.2 KJ/mol) in water is an exothermic process. How much lithium hydroxide (∆Hsoln = -23.6 KJ/mol) is needed to deliver the same amount of heat as 15.00 g of Ca(OH)2? Hello everyone, thank you for taking a look at my question...
Sunday, November 1, 2015 by Ka_Chin

Burnhamthrop Chemistry
initially 0.25 mol of water vapour and 0.20 mor of carbon monoxide are place in a 1.00 L reaction vessel. at equilibrium spectroscopic evidence shows that 0.10 mol of corbon dioxide is present calculate K for the reaction
Saturday, October 31, 2015 by Omar

chemistry
0.5 mol CCl4 is introduced into a 10.0L flask.what fraction of the total volume of the flask is occupied by CCl4 molecules?
Saturday, October 31, 2015 by faiz

Chemistry
A 0.1818 g sample of sodium oxalate required 28.12 ml of a potassium permanganate solution to reach the endpoint (assume the reaction was carried out in excess acid). A 5.000 g sample of tin (II) sulfate containing potassium sulfate as an impurity was found to require 35.00 ml...
Saturday, October 31, 2015 by Anonymous

Chemistry
A ball bearing at 22.0 Celsius is dropped into a cup containing 250.0 g of water at 20.0 Celsius. The water and ball bearing come to a temperature of 30.0 Celsius. What is the heat capacity of the ball bearing in J/Celsius? How do I do this kind of question? I don't expect...
Saturday, October 31, 2015 by Aurora

Chemistry
A weather balloon is inflated to a volume of 29.9 L at a pressure of 755 mmHg and a temperature of 33.0 ∘C. The balloon rises in the atmosphere to an altitude where the pressure is 385 mmHg and the temperature is -16.2 ∘C. Assuming the balloon can freely expand, ...
Saturday, October 31, 2015 by Anonymous

Chemistry
I have to prepare 1ppm of Fe+2 solution in 1litre. How many grams of ferrous ammonium sulphate will be dissolved in 1litre to make above solution.. plzz guide me
Saturday, October 31, 2015 by Syed

chemistry
How many kilojoules are absorbed when 318 g of Ca(OH)2 reacts?
Saturday, October 31, 2015 by kiersten

chemistry
pls balance the equation AL3C4+H2O-CH4+AL(OH)3
Friday, October 30, 2015 by seun

Chemistry
Balance the equation: NO2- (aq) + Al (s) --> NH3 (g) + AlO2- (aq) (basic solution) ** please note the "2-" on the NO2- and AlO2- are not subscripts, they are the charges. I missed a few classes in Chemistry and find myself lost. I have tried to learn these ...
Friday, October 30, 2015 by Nikki

Chemistry
An unknown diatomic gas has a density of 1.428 g/L at STP. What is the identity of the gas? (Enter the formula of the gas. Omit states-of-matter from your answer.)
Friday, October 30, 2015 by WhiteRabbit

Chemistry
Find number of hydrogen atoms: 1 mol of NH3 1 mol of N2H4 4 mol of NH3 3 mol of N2H4
Thursday, October 29, 2015 by Anonymous

Chemistry
How many atoms are there in: A. 1 mole of Si? B. 2 mole of Si? C. 0.5 moles of Si? D. 0.10 moles of Si? I'm having trouble setting these up.
Thursday, October 29, 2015 by Anonymous

Chemistry
Calculate the mass of Fe(OH)3 s) produced by mixing 50.0 mL of 0.153 M KOH (aq) and 25.0 mL of 0.255 M Fe(NO3)3 (aq), and the number of moles of the excess reactant remaining in solution. I got 0.00383 mol Fe(NO3)3 remaining. I don't know how to obtain the mass of Fe(OH)3...
Thursday, October 29, 2015 by Tiffany

chemistry (helppp me)
what is the bond order for BeF2? according to the lewis structure? ....according to MO diagrams its 0. 16 valence e-
Thursday, October 29, 2015 by Anonymous

CHEMISTRY! HELP
1. Given the following set of quantum numbers: 3py -1/2. A chemistry student claims that this represents a peanut-shaped electron. Is she correct? Answer (Am I correct? If not, how?) : She is correct because 3py is a peanut shape with -1/2 being the spin. 2. A chemistry ...
Thursday, October 29, 2015 by Sophia

Chemistry
When Zn(OH)2(s) was added to 1.00 L of a basic solution, 1.24×10−2 mol of the solid dissolved. What is the concentration of OH− in the final solution?
Thursday, October 29, 2015 by Amber

chemistry
if there are 8 homo orbitals, how do i know how many lumo orbitals there are?
Thursday, October 29, 2015 by Anonymous

chemistry
what is the bond order for BeF2?
Thursday, October 29, 2015 by Anonymous

Chemistry
What is the mass of an atom's nucleus called?
Thursday, October 29, 2015 by Anonymous

Chemistry
Does adding a proton to lithium-7 make it a positively charged ion?
Thursday, October 29, 2015 by Anonymous

mathematics
in a class of 60 students, the number of students who passed biology is 6 more the number of student who passed chemistry. Every student passed at least 1 subject and 8 passed both subject. How many passed chemistry
Thursday, October 29, 2015 by conan

Chemistry
Sulfur dioxide SO2 is released in the combustion of coal. Scrubbers use aqueous slurries of Ca(OH)2 to remove the sulfur dioxide from the flue gases. Write a balanced equation for this reaction and calculate delta So at 298 K (So for CaSO3(s) = 101.4 J/{mol*K}). include the ...
Thursday, October 29, 2015 by Mark

Chemistry
HOW MANY MOLES OF solute are present in each of the following 50.0mL OF1.20M HNO3
Thursday, October 29, 2015 by Felicia

Chemistry
Methanol, a major industrial feedstock, is made by several catalyzed reactions, such as CO(g) + 2H2(g) ----> CH3OH (l) One concern about using CH3OH as an auto fuel is its oxidation in air to yield formaldehyde, CH2OH(g) which poses a health hazard. Calculate ÄG o at ...
Thursday, October 29, 2015 by Henry

Chemistry
The equilibrium constant for the reaction 2SO2 + O2 <=> 2SO3(all are gases) at a certain const temperature is 846.4mol/dm^3. At equilibrium in a 1dm^3 vessel, 0.5 moles of SO2, 0.1 moles of O2, and 4.6 moles of SO3 were found. How many moles of oxygen must be added to ...
Thursday, October 29, 2015 by Karan

college chemistry
Describe the preparation of 250cm^3 of 0.05M H2SO4 given the following stock bottle solution. %purity=98 Specific gravity=1.84 Molecular weight=98
Wednesday, October 28, 2015 by Ezinase

chemistry
Calculate Delta G for each reaction using Delta Gf values: answer kJ ...thank you a) H2(g)+I2(s)--->2HI(g) b) MnO2(s)+2CO(g)--->Mn(s)+2CO2(g) c) NH4Cl(s)--->NH3(g)+HCl(g) is this correct? a) H2(g)+I2(s)--->2HI(g) From tables: G HI = +1.3 kJ/mol G H2 = 0 G I2 = 0 dG...
Wednesday, October 28, 2015 by Patrick

chemistry
If the specific heat of water is 4.180 J/(g/°C), what mass of water can be heated from 5.0 °C to 80°C by 27.0 kJ of heat?
Wednesday, October 28, 2015 by wendi

Chemistry
Two aqueous solutions, both at 25.00°C (100.0 mL of 0.223 M Pb(NO3)2 and 100.0 mL of 0.144 M Na2S), are mixed together in a calorimeter with a Ccalorimeter of 11.8 J/°C. The temperature of the solution increases by 2.40°C. Assuming that the density and heat ...
Wednesday, October 28, 2015 by Matt

Chemistry
2 KMnO4 + 5 H2C2O4 + 3 H2SO4 ---> 2 MnSO4 + 10 CO2 + 8 H2O + K2SO4 How many milliliters of a 0.123 M KMnO4 solution is needed to react completely with 3.141 of oxalic acid? Please help I've worked this every way I know.
Wednesday, October 28, 2015 by Tyler

Chemistry! HELP
A chemistry student used the symbol "sx" to represent an s orbital that lies along the x-axis. Is this reasonable. Justify your answer.
Wednesday, October 28, 2015 by Sarah

Chemistry! HELP
What information about an electron in an atom is given by the following quantum numbers? 2px+1/2 Answer? (idk if this is right) : An electron located in the p orbital in the 2nd main enrgy level would be said to be located in the 2p sublevel.
Wednesday, October 28, 2015 by Sarah

Chemistry
How many joules of heat are needed to completely vaporize 24.40g of H2O at its boiling point. Delta H vap = 40.6kJ/mol
Wednesday, October 28, 2015 by Cindi

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