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February 11, 2016

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Chem
AgNO3 solutions are often used to plate silver onto other metals. What is the maximum amount of silver in grams that can be plated out of 4.2L of an AgNO3 solution containing 3.1% Ag by mass?
April 18, 2014 by Marianella

chemistry
What is the pH of a buffer solution if you have 250 ml of a 1.56M Acetic Acid and you added 26.56 grams of sodium acetate (NaCH3CO2)? What is the new pH if you now add 1gram of NaOH to the buffer solution?
August 5, 2015 by lilly

Chemistry 101
A student using a 100mL graduated cylinder that contained 50.00mL of water. Th volume of the water increased to 57.50mL. The density of the object was 7.85 g/cm^2. How many grams did the metal object weigh?
January 25, 2016 by Lilly

Chemistry 101
A student using a 100mL graduated cylinder that contained 50.00mL of water. Th volume of the water increased to 57.50mL. The density of the object was 7.85 g/cm^2. How many grams did the metal object weigh?
February 9, 2016 by Lilly

science: cells
1~ What do red blood cells do and is there anything significantly different about them from other types of cells? 2~ What are bone cells and is there anything significantly different about them from other types of cells? (I just need help for studying i was absent a week from ...
February 12, 2007 by Lesley

Calculus
I know I posted this problem earlier but I dont think it will be seen anymore since it's almost at the end of the page: Find the total mass of the triangular region with coordinates (-1,0),(0,4),and (1,0). All lengths are in centimeters, and the density of the region is (x)=5+...
October 26, 2011 by Caroline

chemistry
Ammonium nitrate decomposes explosively at high temperatures to form nitrogen, oxygen, and water vapor. 2NH4NO3-->2N2+4H2O+O2. Calculate the number of grams of water formed when 25 L of N2 is produced in this reaction (assume STP)
October 19, 2009 by Meg

Chemistry
The following thermochemical equation is for the reaction of iron(s) with chlorine(g) to form iron(III) chloride. 2Fe(s) + 3Cl2(g) 2FeCl3(s) H = -799 kJ How many grams of Fe(s) would have to react to produce 107 kJ of energy? I am not sure how to start this.
February 4, 2012 by Hannah

Chemistry
Potassium hypobromite, KOBr, converts ammonia to nitrogen by the following reaction. 3KOBr + 2NH3 N2 + 3KBr + 3H2O To prepare 448.2 mL of dry N2, when measured at 22.3 °C and 777.3 torr, what is the minimum number of grams of KOBr required?
April 12, 2013 by Paxton

Chemistry
Potassium hypobromite, KOBr, converts ammonia to nitrogen by the following reaction. 3KOBr + 2NH3 N2 + 3KBr + 3H2O To prepare 448.2 mL of dry N2, when measured at 22.3 °C and 777.3 torr, what is the minimum number of grams of KOBr required?
April 12, 2013 by Paxton

Chemistry
Potassium hypobromite, KOBr, converts ammonia to nitrogen by the following reaction. 3KOBr + 2NH3 N2 + 3KBr + 3H2O To prepare 448.2 mL of dry N2, when measured at 22.3 °C and 777.3 torr, what is the minimum number of grams of KOBr required?
April 12, 2013 by Paxton

chemistry
For the reaction 2 Na + 2 H2O -------> 2 NaOH + H2, how many grams of hydrogen gas are produced when 133.6 g of water are reacted? I tired it like the steps to the last one and I still got answer wrong can you please show steps you would perform?
May 17, 2014 by Kalli Simpson

Chemistry
What is the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen? -I found this to be C3H3O and WebAssign says it's right. I need help with part b. If the molar mass of the above compound is 110 grams/mole, what is the molecular formula?
January 11, 2015 by Bridget

chemistry
sorry i didn't post before.. Lab: Electrolytic Cells Purpose: The purpose of this experiment is to test the method of stoichiometry in cells. Materials: Balance Steel can Tin electrode Power Source Wire lead (x2) tin(II) chloride solution (3.25 M) Timer Large beaker Procedure...
April 18, 2008 by samantha

science
humidity is the amount of water vapor in the air at a given time. at warm temperatures, air can hold more moisture than it can at cold temperatures. Relative humidity is the amount of vapor the air is holding expressed as a percentage of the amount the air is capable of ...
May 1, 2008 by barby

chemistry
Lab: Electrolytic Cells Purpose: The purpose of this experiment is to test the method of stoichiometry in cells. Materials: balance steel can tin electrode power source wire lead (x2) tin (II) chloride solution (3.25 M) timer large beaker Procedure: Take the mass of the steel ...
April 17, 2008 by Jennifer

Chemistry
If one gram of sodium bicrbonate made it into your stomach from 1 teaspoon of baking soda, how many moles of acid could it neutralize? mols NaHCO3 = grams/molar mass. mols HCl=mols HCO3%-
February 20, 2007 by Bob

Chem.
If 229 g of Pb(NO3)2 and 190 mL of 1.68 M aqueous NaI are reacted stoichiometrically according to the balanced equation, how many grams of Pb(NO3)2 remain? Round your answer to 3 significant figures. Pb(NO3)2(aq) + 2NaI(aq) → PbI2(s) + 2NaNO3(aq)
February 26, 2010 by Todd

Chemistry
Potassium permanganate (KMnO4) solutions are used for the determination of iron in samples of unknown concentration. As a laboratory assistant, you are supposed to prepare 700. mL of a 0.200 M KMnO4 solution. What mass of KMnO4, in grams, do you need?
March 9, 2014 by Mark

Chemistry
is this true or false? 5) Density has units of grams per cubic centimeter. It may have units of g/cc. But the unit used is strictly up to the individual calculating. It may be in kg/cubic meter or any of a number of other conversions.
February 1, 2007 by Bryan

chemistry
Calculate how much acetone (in grams and in kilograms) needs to be weighed to assure that you placed 1.25 liters of acetone inside a bottle that needs to be shipped to a chemical laboratory. For the density use 0.7857 g/mL.
February 12, 2008 by Julie

chemistry
which conversion factor do you use first to calculate the number of grams of CO2 produced by the reaction of 50.6 gram of CH4 with O2? The equation for the complete combustion of methane is: CH4+2O2-->CO2+2H2O.
June 9, 2008 by afdsfd

chemistry
elemental sulfur can bea formed through the combustion of hydrogen sulfide (found in methane gas) carve in equation; H2 S +O2----S + H2 4 tell how much sulfur is made from 250 grams of methane
February 9, 2010 by nycole

chemistry
1.)How many grams would you need of a sample known to be 99.81% AgN03 by mass? You are asked to prepare 150.0 mL of 3.15×10−2 M AgNO3. 2.) An aqueous solution is 6.40% methanol CH3OH by mass, with d = 0.988 g/mL} What is the molarity of CH3OHOH} in this solution?
February 16, 2010 by Andrew

chemistry
1.)How many grams would you need of a sample known to be 99.81% AgN03 by mass? You are asked to prepare 150.0 mL of 3.15×10−2 M AgNO3. 2.) An aqueous solution is 6.40% methanol CH3OH by mass, with d = 0.988 g/mL} What is the molarity of CH3OHOH} in this solution?
February 16, 2010 by Andrew

chemistry
Solid magnesium metal reacts with chlorine gas according to the following equation: Mg + Cl2 --> MgCl2 What mass of magnesium chloride is formed in the reaction between 7 g of Mg and 13.2 g of Cl2 is this correct 7 g+13.2 g = 20.2 grams ?
September 19, 2010 by kellie

Chemistry
H2C2O4 * 2H2O (s) is a primary standard substance. 2.3688 grams of oxalic acid dihydrate were completely neutralized by 42.56 milliliters of NaOH solution. Calculate the molar concentration of the NaOH solution.
March 26, 2011 by Cassie

Chemistry
Ethanol, C2H5OH, is mixed with gasoline and sold as gasohol. Use the following to calculate the grams of ethanol needed to provide 367 kJ of heat. C2H5OH(l) + 3 O2(g) ¨ 2 CO2(g) + 3 H2O(g) ƒ˘H = −1235 kJ
November 21, 2011 by Samantha

Chemistry
320g of sulfur dioxide react with 32.0g of oxygen and excess water to form sulfuric acid (H2SO4) a. What is the limiting reagent? b. What is the theoretical yield of product? c. How many grams of excess reagent will remain?
January 11, 2012 by Kelly

Chemistry
1) Consider the formation of sulfur trioxide according to the reaction: 2 SO2(g) + O2(g) -> 2 SO3(g) delta H = -198 How much heat is evolved in the formation of 750 grams of SO3? I am not sure how to start this problem.
January 20, 2012 by Hannah

Chemistry
Calculate the density of a substance in pennyweights per peck that has a volume of 0.371 hogsheads and a mass of 41.6 kg. 1 pennyweight = 1.55 grams 1 hogshead = 238.5 liters 1 peck = 9.091 liters. Answer in units of pw/pk.
September 27, 2012 by Peter

Chemistry 1
We are working on molarity of a solution in my class, and I am a little stumped on how to set the problems up. Here is one question from my homework. How many grams of NaCl are needed to make 575mL of 1.5 M NaCl solution? Thank you in advance :)
January 3, 2013 by Emily

Chemistry
A mixture is prepared by adding 25.0 mL of 0.185 M Na3PO4 to 34.0 mL of 0.140 M Ca(NO3)2. (a) What mass, in grams, of calcium phosphate will be formed? What will be the concentration of each of the ions in the mixture after the reaction? (b) [Ca2+] (c) [PO43-] (d) [Na+] (e) [...
March 2, 2013 by Freddy

Science
When heated solid iron3 hydroxide decomposes to produce iron 3 oxide and water vapor if 0.75L of water vapor is produced at 227 degrees celsius and 1.0 aTm. how many grams of FE(OH)3 were used?
May 17, 2013 by Samantha

physics 2
if 120 g of hot water at 85 degree celsius is poured into an insulated cup containing 200 g of ice at 0 degree celsius. how many grams of liquid will there be when the system reaches thermal equilibrium?
January 19, 2014 by phase change

Chemistry
5C(s)+2SO2(g)->CS2(I)+4CO(g) A-) if you have 6.78 g of C and 7.54 g of SO2, how many grams of CO can be created? B-) what is the limiting reagent from A? C-) how much of the excess reagent is left after reaction? D-) if only 5.89 of CO was actually created, what is the ...
May 22, 2014 by PawToo

physics
two masses are attached to both ends of a flexible cord passing through a friction less pulley. if the system is at rest, find the tensions at object A and object B. Object A = Object B. A=60 grams.
August 3, 2014 by Kzsa

chemistry
If you wanted to produce 0.25 L of CO2 gas (at STP), how many grams of sodium bicarbonate would I need to use? Acetic acid is in excess. (IT IS ASSUMED YOUR ANSWER IS IN g NaHCO3 so you do not need to include that in your answer.)
October 25, 2014 by Ali

chemistry
calculate the grams of 1.8% (m/m) NaCl solution that contains 8.00 g of NaCl I tried 1.8 times 8.00g divided by 58.44g times 100 my answer is 24.6g rounded to 2 SF is 25g this truned out to be wrong I'm stumped!
April 1, 2015 by k

chemistry
A 32.5 g sample of K2SO4 is dissolved in a quantity of water and stirred well. A 40.00 mL sample of the solution is evaporated to dryness and leaves behind 5.00 g of solid K2SO4.what is the molarity. Calculate molar masses of solutes to .01 grams
April 26, 2015 by mark

Chemistry Gas Law
How many grams of Mg must react with HCl in order to produce 40.0 ml of hydrogen gas at 22 degrees celsius and 1.02 bar? If the magnesium ribbon weighs 1.83mg/mm, how many mm of the ribbon will you require? Thanks in advance for your help!!
May 12, 2015 by Ryan

Chemistry
Based solely on the amount of available carbon, how many grams of sodium oxalate, Na2C2O4, could be obtained from 175 g of C6H6? (Assume that no loss of carbon occurs in any of the reactions needed to produce the Na2C2O4.)
October 15, 2015 by Amanda

Chemistry
to make a sodium chloride solution of the same molarity as household bleach (as determined in question 1) how many grams of salt would be needed for every 100 ml of solution question 1 answer: 0.871 M
February 7, 2016 by Lola

Chemstry
A 5.00 gram mixture of CaO and CaCO3 is heated strongly. After heating, the mixture has a mass of 4.00 grams. What % of the original mixture is CaCO3?
December 13, 2010 by Paul

chemistry
calculate the mass, in grams, of NaCl present in each of the following solutions. 6.25 g of 11.5% NaCl solution 452 g of 12.3% NaCl solution please show me how to do these. Thanks.
April 29, 2011 by pat

Chemistry
Consider the reaction MnO2+4HCL===>MnCl2+Cl2+2H2O How many grams of MnO2 are required to produce 5.6 of Cl2 at stp?MnO2=87
April 23, 2012 by faisal

Chem
Fingernail polish is mainly acetone (C3H6O) and has a density of 0.788gcc. A. HOW MANY GRAMS OF ACETONE ARE IN A O.5L BOTTLE B HOW MANY MOLECULES OF ACETONE ARE IN THAT SAME BOTTLE
July 17, 2013 by Leslie

Biochemistry
Calculate the amount (in grams) of Tris Base needed to make 1L of 0.01M Tris buffer? Tris Base=121.4 g/mol
September 10, 2015 by San

chemistry
If you collect hydrogen gas over water at a temperature of 85*C, what is the volume of just the water if the pressure of hydrogen is 1.23 atm and the grams of hydrogen was 2.6
May 6, 2014 by brandie

chemistry
Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.25g/mL and is 38.3{\rm \\%} sulfuric acid by mass.
January 21, 2015 by Anonymous

delgado community college
seawater contains 0.0065% (by mass) of bromine. how many grams of bromine are ther in 1.oo l of seawater? the density of seawater is 1.025 g/ml.
March 5, 2015 by nona

Chemistry
CuSO4 + X h20 -> CuSO4 +xH20 ... a 9.6 g sample of CuSO4 was allowed to absorb water. After absorption the sample weighed 15.01 grams. What is the value of x?
October 9, 2010 by MAX

Physics
A string is under a tension of 700.0 N. A 1.5 m length of the string has a mass of 4.5 grams. What is the speed of a transverse wave of wavelength 0.50 m in this string? What is the frequency of the wave?
November 4, 2010 by Jerome

chemistry
A samples with a mass of 35 grams and a temperature of 97.3 degree c is placed into 75.0 g of water at 19.7 degree c. The final temperature is 22.3 degree c, what is the specific heat of the sample?
January 25, 2011 by Linda

Math/Nutrition
I need to figure out percentages of total calories that come from carbohydrates. I do not know the formula for this. There are 29 grams of carbohydrates and 116 calories from carbohydrates.
September 3, 2011 by Anonymous

Math
A rectangle sheet of aluminum foilis 50 centimeters long and 20 centimeters wide, and weighs 5.4 grams. 6ind the thickness of the aluminum foil in centimeters.
September 20, 2011 by madelyn

chemistry
If 9.20 g of sodium metal reacts with chlorine gas to make sodium chloride, how mnay grams of chlorine are required to react completely with the sodium?
October 10, 2011 by Anonymous

Chemistry
Ok i need a little help. I have the answer to this question but i need to know how the teacher got the answer. How many grams of water are in a 100g of a 30% sugar solution? My answer is 70.
March 21, 2012 by Sharon

Math
A provider requested 2% salicylic acid ointment. How many grams of a base ointment should be added to 60 g of 3% salicylic ointment to prepare the final product?
July 6, 2012 by Niricoel

math
Natalie is buying potatoes at the grocery store. If she buys 6 potatoes that each have a mass of 375 grams, what is the total mass of the potatoes, in kilograms?
March 13, 2013 by kay

Chemistry
1.50g of NaHCO3 is dissolved in 17.1g of water. Express the solubility of NaHCO3 in grams per 100g of solvent and calculate the % composition of NaHCO3 and water.
August 21, 2014 by Mo

biology
1. The energy used by living organisms a. is declining through time. b. is derived by breaking bonds that hold the atoms in organic molecules together. c. involves ionic bonds more often than covalent bonds. d. is available only from glucose when it undergoes respiration. e. ...
June 24, 2011 by akim

Chemistry
Determine how many atoms there are in 1 litre of hexane or gasoline. A litre of gasoline has a mass of approximately 850.0 grams. Assume that the molecular formula for gasoline is C6H6
July 27, 2010 by Kelsey

Chemistry
Determine how many atoms there are in 1 litre of hexane or gasoline. A litre of gasoline has a mass of approximately 850.0 grams. Assume that the molecular formula for gasoline is C6H6
July 27, 2010 by Kelsey

chemistry
CH4 + 2O2 = CO2 + 2H2O Starting with 13.6 g of CH4, calculate the mass in grams of CO2 produced if there is enough O2 gas to react with all of the CH4
October 3, 2011 by Kayla

Chem
When 1.0 grams of gasoline burns, 11500 calories of heat energy are given off. If the density of gasoline is 0.66 g/ml , how many kilocalories of energy are obtained from 1.5 gallons of gasoline?
July 2, 2013 by Anonymous

Physics
Determine the amount of energy required to raise the temperature of 250 grams of steel from a temperature of 15 oC to a temperature of 40 oC . The specific heat of steel is 0.11 cal/gram oC.
March 30, 2015 by Melissa

Chem 011
I can not figure out how many mols are in 102grams of NH3? mols = grams/molar mass. mols NH3 = 102/17 = ??
April 10, 2007 by Stephanie

college chemistry
Calculate the amount of heat required to heat 80 grams of water from 10 to 53°C. The specific heat capacity for water is 4.184 J/g°C.
September 7, 2010 by summer

Math
a 52g. weight tied to a spring stretches the spring 1.3cm. How many grams would it take to stretch the spring 3cm?
December 5, 2010 by Sara

Science
The volume of a solution was measured in a graduated cylinder (shown above). If the mass of solution is measured to be 60.75 grams, what is the density of the solution?
February 14, 2011 by Niicly

Chemistry
If 3.00 mol of calcium carbonate is heated to produce calcium oxide and carbon dioxide, how many grams of calcium oxide are produced?
March 29, 2011 by John Goodroe

Chemistry
If 3.00 mol of calcium carbonate is heated to produce calcium oxide and carbon dioxide, how many grams of calcium oxide are produced?
March 29, 2011 by John Goodroe

chemistry
given 10.8 grams of substance y,if the substance absorbs 231 kilojoules of energy and the specfic heat of substance is 6.55 J/g*0C what is the heat change
November 7, 2013 by Heather

science(conversion factors)
Imagine a particle of dust that masses 25.48ug. What is it's mass in atomic mass units? Round off to appropriate # of significant figures. The answer given in this physics book (Teqnichally not physics hence the conversion subject) is 1.54e19amu I seriously don't get where ...
August 1, 2007 by ~christina~

science
How many grams of water, H(subscript 2)O, and propene, C(subscript 3)H(subscript 6), can be formed from the reaction of 6.0 g of 2-propanol, C(subscript 3)H(subscript 8)O?
April 28, 2013 by rex

chemistry
A rectangular metal bar has a volume of 50.0 inches cubed.The Metal BaR weighs 1.42kg. Calculate the density of the metal in grams per cubic centimeter.
October 12, 2009 by Kevin

science
Suppose 65.8 g of Carbon monoxide reacts with 8.6 g of hydrogen. What is the limiting reagent? What is the theoretical yield of the product in moles and grams? If the actual yield of the product is 3.57 g, what is the percent yield?
October 5, 2010 by Anonymous

Chemistry
a 15.00mL sample of NaOH was titrated to the stoichiometric point with 17.40mL of 0.2340M HCl. a) what is the molar concentration of the NaOH solution? b)calculate the grams of NaOH in the solution.
December 9, 2010 by prince

chemistry
How many grams of iron are needed to produce 42.8 L of hydrogen gas according to the following reaction at 25oC and 1 atm? iron (s) + hydrochloric acid (aq) iron(II) chloride (aq) + hydrogen (g)
January 27, 2012 by jim

Chemistry
A propane stove burned 470. grams of propane and produced 625 milliliters of water. What is the % yield? C₃H₈+5O₂ -> 3CO₂+ 4H₂O
November 29, 2012 by Josh

science
magnesium oxide reacts with phosphoric, H3PO4 TO PRODUCE MAGNESIUM PHOSPHATE AND WATER. HOW MANY GRAMS OF MAGNESIUM OXIDE ARE REQUIRED TO REACT COMPLETELY WITH 33.5G OF PHOSPORIC ACID?
November 1, 2014 by obuchi

Physics
We have to work out the accepted value of a roller coaster cart (taking into account friction) when the mass is modified Here is the answer I got for 56.71 grams: 0=∆EGP+∆EK+Fd 0=mg(hf-hi )+1/2 m(v^2-u^2 )+Fd 0=0.05671 × 9.8 (0.075-0.786)+1/2× 0.05671 (v^2-0^2 )+(0...
June 2, 2015 by Madi

chemistry
Chlorine dioxide, ClO2, has been used as a disinfectant in air conditioning systems. It reacts with water according to the following equation. ... HCl If 142.0 g of ClO2 is mixed with 33.0 g of H2O, how many grams of which reactant remain if the reaction is complete?
June 29, 2010 by Cynthia

Chemistry
Reviewing for final (this should be basic but...I am stuck): Describe how you would prepare 500.0 grams of a solution of sucrose, C12H22O11, in water which the mole fraction of sucrose is 0.125. I feel like somehow this is a molality question too :( Thank you for any input.
May 19, 2012 by MiaowDescribe how you would prepare 1.00

CHEMISTRY-Explanation Please
In the laboratory, 3.50 grams of salicylic acid were reacted with 7.20 ml of acetic anhydride (density equal to 1.08 g/ml). Determine the limiting reagent. Calculate the theoretical yield of the product, acetylsalicylic acid (ASA), produced in the above reaction.
November 25, 2012 by Yaw

General Chemistry
A freshman is currently enjoying the Arts Studio program she is pursing at a well-know university. In her free time, she like to skate, take salsa dance lessons, and cook. She particularly enjoys pickling and decides to pickle olives over a lesisurely weekend. Accordng to the ...
August 31, 2012 by Kameesha

Chemistry
A 50 gram sample of liquid water at 25 degrees C is mixed with 29 grams of water at 45 degrees C. The final temperature of the water is...?
December 6, 2012 by Bree

math
sophie ruth is eating a 50 gram chocolate bar which is labled 30 % cocoa how many grams of chocolate are in the chocolate bar
February 18, 2014 by ashley

science
1.3 mol of calcium carbonate decomposed to calcium oxide and carbon dioxide. How many grams of calcium oxide is produced?
September 22, 2014 by Xolani Rudolph Ngovene

chemistry
If a solution of barium hydroxide contains 9.1x1025 hydroxide ions, how many grams of barium hydroxide were originally dissolved?
December 13, 2015 by Anonymous

chemistry
NH4NO3 --> N2O + 2H2O you start with 1000g of ammonium nitrate, what is the theoretical yield of laughing gas? How many grams of water will be produced. *I know you COULD have 450.234g of H20, but I'm not sure how to do the theoretical yield.
September 13, 2007 by samantha

math
i need help with this question- a bag of chcolate candies has a nutrition label ststing that each seving contains 20% of the recommended daily amount of fat.A serving has 13 grams.using this informtaion what is the recommended daily value
February 28, 2008 by Juliana

chemistry
hi, i was wondering if anyone could help me with this problem? i am having some difficulty with it. thanks. a).how many grams of Al(NO3)3 are needed to prepare 300mL of a 1.071 M solution? b).if you further dilute this 300mL to a new final volume of 5.0L, calculate the final ...
March 4, 2008 by tina

chemistry/science
2HCl + Mg = H2 + MgCl2 We are given 0.10 grams of Mg The concentration of Mg = 24g/mol Using avogadro's law (V=n/c; v-volume(L), n-number of moles(mol), c-concentration(g/L)) we have to predict the amount of HCl needed. help !
September 24, 2008 by Lucia

Chemistry
A quantity of N2 occupies a volume of 1 L at 290 K and 1.5 atm. The gas expands to a volume of 2.7 L as the result of a change in both temperature and pressure. Find the density of the gas at these new conditions (in grams per liter).
October 24, 2009 by .

Chemistry
An alpha particle (mass 6.6 x 10^-24 grams) emitted by radium travels at 3.4 x 10^7 plus or minus 0.1 x 10^7 mi/h. (a) What is its de Broglie wavelength (in meters)? (b) Whats uncertainty in its position? for part a I got -3.41 x 10^6 meters which said it was wrong and I don't...
March 4, 2010 by Samantha

College chemistry
103.5 mL of hydrogen are collected over water at 22.2 degrees Celsius and 758.2 torr from reaction with 0.1356 grams of alloy. calculate the number of moles of dry hydrogen gas that were collected.
March 30, 2010 by Paula

chemistry
When magnesium is heated in air, it reacts with oxygen to form magnesium oxide. 2Mg + O2 --> 2MgO If the mass of the magnesium increases by 0.335 g, how many grams of magnesium reacted? A. 0.882 B. 0.441 C. 0.509 D. 1.02 E. Not enough Info
July 5, 2010 by Kristen

chemistry
The following reaction is carried out as a source of hydrogen gas in the laboratory: Zn(s) + 2HCl(aq) ---> ZnCl2(aq) + H2(g) If 305 mL of hydrogen gas is collected over water at 25 °C at a total pressure of 746 mm Hg , how many grams of Zn reacted?
November 6, 2010 by amy

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