Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

college chemistry
Calculate how much carbon you use in a year, by considering how much driving you do a year. If I use 500 gal per year, what is my answer? balanced combustion equation which shows how the main component in gasoline reacts in your car and produces carbon dioxide: 2C8H18(l) + ...

Chemistry
A 5.0×101 kg sample of water absorbs 324 kJ of heat. If the water was initially at 22.2 ∘C, what is its final temperature?

Chemistry
3Cu(s) + 8HNO3(aq) → 2NO(g) + 3Cu(NO3)2(aq) + 4H2O(l) If 15 g of copper metal was added to an aqueous solution containing 6.0 moles of HNO3, how many moles of NO(g) would be produced, assuming a 59.8 % yield.

chemistry
empirical formula for K 60.0% C 18.5% N 21.5% and P 7.5% I 92.5%

Chemistry
how many chloride ions are in 0.28 mol MgCl2?

chemistry
A 8.408 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 12.53 grams of CO2 and 3.849 grams of H2O are produced. In a separate experiment, the molar mass is found to be 118.1 g/mol. Determine the empirical formula and the ...

Chemistry
Recall the reactions for this lab: S2O82- + 2I- → 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- → 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, Δ[S2O32] = c. Use the ...

Chemistry
. A student mixed the following reactants, using the general procedure for the experiment: 10.0 mL of 0.10 M KI, 10.0 mL of 0.0010 M Na2S2O3, 20.0 mL of 0.040 M K2S2O8, and 10.0 mL of 0.10M HCl. It took about 75 seconds for the mixture to turn blue. a. By using the dilution ...

Chemistry
Recall the reactions for this lab: S2O82- + 2I- → 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- → 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, Δ[S2O32] = c. Use the ...

General Chemistry
A student mixed the following reactants, using the general procedure for the experiment: 10.0 mL of 0.10 M KI, 10.0 mL of 0.0010 M Na2S2O3, 20.0 mL of 0.040 M K2S2O8, and 10.0 mL of 0.10M HCl. It took about 75 seconds for the mixture to turn blue. a. By using the dilution ...

chemistry
What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water? Just making sure would it be 11.1 divided by 2269.2 times 100?

Chemistry-Urgent
What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water?

Chemistry-Urgent
The partial pressure of CO2 inside a bottle of soft drink is 4.0 atm at 25°C. The solubility of CO2 is 0.12 mol/L. When the bottle is opened, the partial pressure drops to 3.0 ✕ 10-4 atm. What is the solubility of CO2 in the open drink? Express your answer in grams per liter.

Chemistry
What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH) can you please explain it better? I still don't quite understand

Chemistry
What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH)

Chemistry
which salt solution would have the highest ph and why KI,KBr,KF,KCL or they all have the same ph. Im leaning towards KF since im pretty sure the other salts are neutral?

Chemistry
What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH)

Chemistry
If you have 1911.9 g of a bleach solution. The percent by mass of the solute sodium hypochlorite NaOCl is 3.62. How many grams of NaOCl are in the solution

CHEMISTRY
You carefully weigh out 20.00 g of CaCO3 powder and add it to 81.00 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 92.80 g . The relevant equation is CaCO3(s)+2HCl(aq)→H2O(l)+CO2(g)+CaCl2...

Chemistry
What volume of a 4.50 M KI stock solution would you use to make 0.455 L of a 1.25 M KI solution?

Chemistry
Write the formulas of the compounds formed by NH4+ with the following anions: CN−, HCO3−, SO42−, HPO42−

Chemistry 121
. Using your calculated value for molar heat of reaction, how much heat would be given off in kilojoules if 3.0 grams of magnesium were to react with excess hydrochloric acid. Show work for your calculation. Value is 31.304 kJ/mol Mg

chemistry
Balance the following chemical reaction and determine the number of moles of HI produced when 2.33 moles of H2(g) are consumed in the following chemical reaction: ___H2(g) + __I2(g) -> ___HI (g)

chemistry
Hello, I was confused on this chemistry problem and I was wondering if someone could please help me. 1) Consider the following chemical reaction: 2CH3OH(I) + 3O2 (g) → 2CO2(g) + 4H2O(I) Calculate the number of moles of CO2 produced when 11.25 mL of methanol CH3OH(I) reacted ...

Chemistry-Urgent
What is the percent by volume of ethanol in a solution that contains 26 mL of ethanol dissolved in 113 mL of water? explain please

Organic Chemistry
Draw all the possible conformations for the following compounds and rank their stability (#1 least stable). a) 3-chloro-2-methylpentane rotating between c-3 and c-4 b) 1-cyclopropyl-2-flurocyclohexane

Organic Chemistry
Draw only the different stereoisomers for the following compounds: a) 2,4-diiodohexane b) 1-s-butyl-3ethylcycloheptane

Chemistry
You have 1683.8 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of NaOCl are in the solution? (show work Please)

Chemistry
What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)? (Explain how you got the answer please)

chemistry
You have 1683.8 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of NaOCl are in the solution?

chemistry
What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)?

chemistry
What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water?

chemistry
What volume of a 3.90 M KI stock solution would you use to make 0.430 L of a 1.25 M KI solution?

chemistry
How many grams of CaCl2 would be dissolved in 1.1 L of a 0.17 M solution of CaCl2?

Chemistry
Hello, I was hoping that I could get some help with calculating the mass needed to completely react with this question. In the following chemical reaction between H2 and N2 to produce NH3, what is the mass of N2 needed to completely react with 0.65 g H2 to produce 3.68 g of ...

Chemistry
Hello, I really don't understand how to find the grams of moles in some of these reactions. If someone could help I would appreciate it. 1) Balance the following chemical reaction and determine the number of moles of HI produced when 2.33 moles of H2(g) are consumed in the ...

chemistry
how many moles of co2 produced when 3 moles of hcl react with caco3

chemistry
With reference to collision theory account for the colour change that occurred when HCl was added to K2CrO4 (Cromate)

chemistry
calculate the number of molecules in 6.4g of so2. (b) 1.5 moles of hydrogen chloride

college chemistry
How many grams of NaCN are needed to react with 50.0 g of MgCl2?

Chemistry
Writing balanced chemical reaction of K2CO3 (s) and HCl (aq) ???

science, chemistry
Lead metal is added to 0.150 M Cr3+(aq). Pb(s)+2Cr3+(aq)⇌Pb2+(aq)+2Cr2+(aq). KC=3.2×10−10 What is [Pb2+] when equilibrium is established in the reaction? What is [Cr2+] when equilibrium is established in the reaction? What is [Cr3+] when equilibrium is established in the ...

Chemistry
The number of calories needed to raise the temperature of 5.0g of water from 25C to 55C

Chemistry
How Would You Classify The Oxides Of period3A Elemet?

COLLEGE CHEMISTRY
write the net ionic equation (including phases) that corresponds to zn(no3)2 + Na2CO3--->ZnCO3+2NaNO3.

Chemistry AP
Determine the value of x in al2(so4)3 . xh2o when 4 grams of aluminum sulfate hydrate was heated and 3.5 grams remain. (show working please)

chemistry
Q: Find pH of 0.2 M of CH3COONa + 0.1M of CH3COOH?

Chemistry
Find the number of miles of calcium chloride 0.44g

Chemistry
How many liters of CO2 will be formed from 200. grams of this sugar at STP? C6H12O6--2C2H6O+2CO2

chemistry
How much energy is required to increase the temperature of 755 g of iron from 10 ̊C to (40,679 J)?

chemistry
Hi, I'm doing a post-lab report and I have no idea how to solve this question. It asks which of the following molecules would be useful in quenching benzophenone photoreduction. it then lists oxygen (s1 = 22kcal/mol), 9,10-diphenylanthracene (t1=42 kcal/mol), trans-1,3-...

Chemistry
Iron pyrite (FeS2) is the form in which much of the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron pyrite to produce iron(III) oxide and sulfur dioxide, which is a major source of air pollution and a substantial contributor to acid rain. What mass of...

Chemistry
Air bags in cars are inflated by the sudden decomposition of sodium azide (NaN3) by the following reaction. 2 NaN3(s) −→ 3 N2(g) + 2 Na(s) What volume of N2 gas, measured at 1.30 atm and 88.0◦C, would be produced by the reaction of 65.0 g of NaN3? Answer in units of L.

Chemistry
If one wanted to a make a 500.0 mL of 4.5 x 10-6M solution of this red dye, how many grams would they need to weigh out? The molar mass of the dye is 492 g/mol. SHOW WORK.

Chemistry
Write “yes” or “no” below if the chemical equation is balanced or not. 1. 2H2 + O2 ---> 2H2O 2. S8 + 12O2 ---> 8SO3 3. HgO ---> Hg + O2 4. Zn + HCl ---> ZnCl2 + H2 5. 2Na + 2H2O ---> 2NaOH + H2 6. 2Al + 3FeO ---> Al2O3 + 3Fe 7. 4Si2H3 + 11O2 ---> ...

Chemistry
Give the oxidation state for the metal ion in each of the following compounds, respectively: K2O,CaO,TiO2,V2O5

math statistic
One of your friends knows that you are taking Advanced Placement Statistics and asks for your help wither Chemistry lab report. She has come up with five measurements of the melting point of a compound: 122.4, 121.8, 122.0, 123.0, and 122.3 degrees Celsius. a. The lab manual ...

Chemistry
Which of the following statements cannot be assumed for the vapourization of a liquid? A)Enthalpy is positive B)Entropy is postive C)Temperature (in degrees Celcius) is positive D)They are all true

Chemistry
Is the following a properly written thermochemical equation? 2C8H18 + 25O2 → 16CO2 + 18H2O, ΔH = –5,471 kJ/mol No, the equation does not list the enthalpy of reaction. Yes, the equation is correct. No, the equation does not list the states of each substance. No, the ...

Chemistry
In the following chemical reaction between H2 and Cl2 to produce HCl, what is the mass of HCl produced with 0.35g of H2 completely reacts with 12.42g of Cl2?

chemistry
magnesium react with hydrochloric acid,what is the volume of hydrogen produced at r.t.p when 0.12g of magnesium ribbon react?

chemistry
If 25 g of NH4Cl is dissolved at 80C, how many additional grams would be needed to make the solution saturated?

chemistry
How many grams of O2(g) are needed to completely burn 17.3 g of C3H8(g)?

chemistry
How many grams of NH4Cl will dissolve at 50 degrees C?

Science(chemistry)
Some students believe that teachers are full of hot air. If I inhale 2.2 litres of gas at a temperature of 18 degree Celsius and it heats to a temperature of 38 degree Celsius in my lungs,what is the new volume of the gas?

Chemistry
Given that the battery produces a current of 2.5A that passes through molten zinc chloride for 3 minutes what charge would be dissipated through the electrolyte

Chemistry
Express the absolute value of the partial charges as a decimal fraction of the elementary charge for CH. The bond length, is 131.1 pm, and the Dipole Moment, D is 1.46

Chemistry
Express the absolute value of the partial charges as a decimal fraction of the elementary charge for OH.

Chemistry
What mass of sucrose should be added to 75 gram of water to raise the boiling point about 100.35°C.What mass of sucrose is required to produce the solution of this molality?

chemistry
queous solution of sodium phosphate (Na3PO4). Adding which compound to the solution will cause a phosphate compound to precipitate?

Chemistry
When heated, KClO3 decomposes into KCl and O2. If this reaction produced 79.9 g of KCl, how much O2 was produced (in grams)?

chemistry
Complete combustion of 4.20 g of a hydrocarbon produced 13.4 g of CO2 and 4.81 g of H2O. What is the empirical formula for the hydrocarbon?

Chemistry
If you begin with 34.4 grams of ammonia how many grams of hydrogen and nitrogen can you produce in a decomposition reaction

Chemistry
Element X has a face-centered cubic unit cell structure. If the density of the element is measured to be 12.4 g/cm^3, what is the atomic radius of X? units are in pm (picometers) MM: 102.9055 g/mol I have done this 4 different times and came up with the same answer - 381pm, ...

Chemistry
Complete and balance each of the following molecular reactions. Indicate the phase of each species. If no reaction occurs, write N.R. A) ____ Na2CO3 (aq) + ___ Mg (NO3)2 (aq) --> B)____ K2SO4(aq) + ___ Fe(CH3CO2)2 (aq) --> C)___ AlCl3 (aq) +____ K2S (aq) Please help and ...

Chemistry
A reaction requires 22.4 L of gas at STP. You have 30.5 L of gas at 101.5 kPa and 373 K. Which of the following statements is true? (Use the ideal gas law: PV = nRT where R = 8.31 L-kPa/mol-K.) You will have excess gas for the reaction. You will have enough gas for the ...

chemistry
determine the mass of carbon4oxide produced from burning 104g of ethyne

chemistry
If there are 2.871mol of gas present at a temperature of 200.0K and a pressure of 1.009atm, what would the volume be?

Chemistry
what is the concentration of I- before the reaction when 35 ml of 0.23M KI is mixed with 15 ml of 0.15M Fe3+ 2I- + 2Fe3+ --> 2Fe2+ + I2

chemistry
How can we separate a mixture of iron filings and sodium chloride

Chemistry
Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, ant the rest is nitrogen. If a tank of Trimix 10/50 has a total pressure of 2.07 x 10 4 kPa, then what is the partial pressure of helium?

chemistry (ap)
using the measured value of the extinction coefficient for CV ( extinction coefficient = 87,000 M−1 cm−1 ) calculate the [CV] for and abs of 0.9562 (CV stands for Crystal Violet)

Chemistry
which compound shows small change in solubility from 0°C to 100°C?

Chemistry (ap)
using the measured value of the extinction coefficient for CV ( extinction coefficient = 87,000 M−1 cm−1 ) calculate the [CV] for and abs of 0.9562

Chemistry
While you are doing heavy work, your heart pumps up to 25.0 L of blood per minute. Your muscles get about 80% by volume of your blood under these conditions. What volume of blood in quarts is pumped through your muscles in 107 minutes of work that causes your heart to pump 20....

Chemistry
What volume of oxygen gas at STP would be needed for the complete combustion of 39.0 grams of octane ?

Chemistry
What volume of 12.1 HCL (aq) is needed to prepare 250.0 mL of 1.00 M HCL (aq).

Chemistry
You are supposed to mix 250 mL of a 0.1 M solution of Pb(NO3)2 solution. You would need to mix ______ g of Pb(NO3)2 with enough water to make 250 mL of solution.

chemistry
When silver nitrate reacts with barium chloride, silver chloride and barium nitrate are formed. How many grams of silver chloride are formed when 8.0 g of silver nitrate reacts with 15.0 g of barium chloride? Please explain how to do this. I honestly do not know.

Chemistry
A 14.9g of lead at 92.5C is dropped into a calorimeter with 165g of water at 20.0C. The final temperature of the system is 20.2C. What is the lead's specific heat? -Could I get help setting this up? I'm not sure how I'm supposed to set it up.

Chemistry 2
The molar heat of solution of ammonia is −30.50 kJ/mol. What happens to the temperature of water when ammonia is added to it? I simply don't know how to answer this and wouldn't ask otherwise. I would be very grateful for assistance.

Chemistry
You add 3.5 L of an HCl solution of unknown concentration to 2.0 L of 0.5 M HCl and 4.5 L of water. The final concentration of HCl was 1.5 M. What was the unknown concentration of the initial HCl solution?

chemistry
A stock solution of HNO3 is prepared and found to contain 11.1 M of HNO3. If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L, the concentration of the diluted solution is ________ M.

Chemistry
Consider an alloy that is 14.1% copper by mass in tin. Copper makes up what percentage of the atoms in this sample?

Chemistry
what is the molarity of the following solution? 13.8g of potassium trioxocarbonate (IV) in 200cm^3 of solution

chemistry
10.5g of potassium trioxonitrate(v) salt saturated 5g of solvent at 15°c. Calculate the solubility of potassium trioxonitrate(v) salt at that same temperature in: a)g/100g of solvents b)moles per dm^-3

chemistry
one of the ingredients in detergent making, lauryl alcohol is extracted from coconut oil. A 5.00 g of this substance is added to 100 g of benzene and the solution boils at 80.78° C. what is the molar mass of lauryl alcohol?

chemistry
if 6.0g of carbon is heated in air, the mass of the product obtained could be either 22.0g or 14.0g depending on the amount of air present. with what law would this be in accordance? (C=12, O=16)

Chemistry
If you wanted to create a equimolar buffer using 1.0 mol of NaHS in 1.0L of water what acid would you need to add? how many moles of that acid do you need to add?

Chemistry
Calculate the expected freezing point of a solution of 0.579 g pelargonic acid in 4.225 g of lauric acid, if the melting point of pure lauric acid was measured to be 43.20*C. (MM pelargonic acid = 158.2 g/mol; MM laruic acid = 200.32 g/mol). Kf for lauric acid is 3.90*C/Mc; ...

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Homework Help: Science