Thursday
April 24, 2014

Search: How many grams of Na2HPO4 and NaH2PO4 to prepare 200 mL with pH 8.25 and sum of ions is 0.5M

Number of results: 5,944

Chem wondering how to set it up
1.) A biochemistry student wants to make 4 liters of a phosphate solution using 48.6 g Na2HPO4 (FW=141.96) What is the concentration of this solution? 2. When she reaches the storeroom she finds that there is no Na2HPO4, however there is a bottle of hydrate Na2HPO4 * 7H20. (FW...
Monday, September 16, 2013 at 7:55am by Jon

Chem still confused
1.) A biochemistry student wants to make 4 liters of a phosphate solution using 48.6 g Na2HPO4 (FW=141.96) What is the concentration of this solution? 2. When she reaches the storeroom she finds that there is no Na2HPO4, however there is a bottle of hydrate Na2HPO4 * 7H20. (FW...
Monday, September 16, 2013 at 10:12am by Jon

Analytical Chemistry
Phosphoric acid is a triprotic acid with the following pKa values: pka1: 2.148 pka2: 7.198 pka3: 12.375 You wish to prepare 1.000 L of a 0.0100 M phosphate buffer at pH 7.45. To do this, you choose to use mix the two salt forms involved in the second ionization, NaH2PO4 and ...
Friday, February 22, 2013 at 7:05pm by Sam

Chemistry
How would you calculate the pH of the buffer if 1.0mL of 5.0M NaOH is added to 20.0mL of this buffer? Can someone please explain to me how to do B and C step by step so I could understand it clearly? :) Say, for example, that you had prepared a buffer in which you mixed 10.30 ...
Tuesday, March 4, 2014 at 8:16pm by Airin

Chemistry
How would you calculate the pH of the buffer if 1.0mL of 5.0M NaOH is added to 20.0mL of this buffer? Can someone please explain to me how to do B and C step by step so I could understand it clearly? :) Say, for example, that you had prepared a buffer in which you mixed 10.30 ...
Wednesday, March 5, 2014 at 10:35am by Airin

Chemistry
pKa1 = 2.148, pKa2 = 7.198, pKa3 = 12.375 You wish to prepare 1.000L of a 0.0100M Phosphate buffer at pH7.55. To do this, you choose to use mix the two salt fomrs involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000L volumetric flask and add water to the mark. ...
Friday, February 22, 2013 at 4:01pm by Alba

Chemistry
A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation of the Na2HPo4 and ...
Tuesday, June 29, 2010 at 6:15pm by Richard

Chemistry
A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation of the Na2HPo4 and ...
Wednesday, June 30, 2010 at 8:44am by Richard

Chemistry
How do I calculate the amount of grams of Na2HPO4 and NaH2PO4 to prepare 200 mL of a buffer with an 8.25 pH so the sum of the concentrations of HPO4 and H2PO4 ions is 0.5 M? Does this involve writing a Ka expression and equilibrium? I am confused and Thanks for your help!
Sunday, March 11, 2012 at 2:36pm by Carrie

Chemistry
How do I calculate the amount of grams of Na2HPO4 and NaH2PO4 to prepare 200 mL of a buffer with an 8.25 pH so the sum of the concentrations of HPO4 and H2PO4 ions is 0.5 M? Does this involve writing a Ka expression and equilibrium? I am confused and Thanks for your help!
Sunday, March 11, 2012 at 2:36pm by Carrie

Chemistry
Calculate the amount of Na2HPO4*7H2O in grams needed to make 50 mL of a 0.40 M solution. I think this is dealing with molarity but i cant figure it all out for some reason? Help would be greatly appreciated.
Sunday, March 11, 2012 at 1:51pm by Bruce

science
what will be the law of conversion of a) 65 grams 70 grams b) magnesium + oxygen = magnesium oxide 45 grams ? grams 80 grams c) sodium hydroxide + hydrochoride acid 40 grams 36.5 grams sodium chloride + water ? grams 18 grams
Saturday, August 4, 2012 at 12:35pm by Magaly

chemistry 2
You are instructed to create 800. mL of a 0.69 M phosphate buffer with a pH of 7.6. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. what is the molarity needed for the acid component of the buffer?What is the molarity needed for the base ...
Tuesday, March 4, 2014 at 3:36pm by Danielle

Math
Maggie's surprise gift weighs between 8.48 grams and 11.25 grams. Which of these weights could be the weight of the gift? 8.19 Grams 8.75 grams 11.47 grams 11.75 grams ~~~~~~~~~~~~~~~~~~~ How would I show my work on paper for this?
Monday, April 30, 2012 at 7:30pm by Syd

chemistry
Mr. Arswan iss preparing a mixture for a science experiment. He measures 10.5 grams of wood shavings, 150 grams of iron filings, and 18.50 grams of salt. What is the total mass of Mr. Arswan`s mixture? A 30.5 grams B 179 grams C 150.5 grams D 17.9 grams
Sunday, October 6, 2013 at 6:55pm by na

medicine
3.6gm na2hpo4 + 1gm nah2po4
Saturday, June 15, 2013 at 12:07pm by Anonymous

Chemistry
K2SO4+ Na2HPO4=? NaHCO3 + Sr(NO3)2=?
Sunday, September 29, 2013 at 9:47pm by kelly

Chemistry
What is the oxidation state of: O2 HSO4- Na2HPO4 CrCl3
Thursday, May 3, 2012 at 10:41pm by Allison

CALCULUS
The masses of 10 books are found to be in an arithmetic sequence. If their total mass is 13 kg and the lightest book has a mass of 400 grams, what is the mass of the heaviest book? 2,000 grams 2,100 grams 2,200 grams 2,300 grams 2,700 grams
Tuesday, November 27, 2012 at 11:07am by Chelsy

Chemistry
Calculate the pH of a buffer solution that contains 0.60 M NaH2PO4, and 0.26 M Na2HPO4.
Sunday, April 14, 2013 at 11:18am by Maddie

Chem. Again
28: You have a glass of pure water. Are chemical reactions occurring in the water? If so, what are they? If not, explain why not. 29: While investigating the effects of acid rain in your area, you discover a lake that is surprisingly resistant to changes in pH caused by acid ...
Tuesday, May 12, 2009 at 11:30am by Rachel

Statistics
The USDA size standards for eggs are based on weight and are as follows: SMALL: greater than 43 grams, less than 50 grams MEDIUM: greater than 50 grams, less than 57 grams LARGE: greater than 57 grams, less than 64 grams EXTRA LARGE: greater than 64 grams, less than 71 grams ...
Thursday, March 4, 2010 at 9:00am by Ion

chemistry
how to prepare 1M,50ml buffer solution by taking Na2HPO4 and NaH2PO4.
Wednesday, November 16, 2011 at 2:29pm by umesh

biochemistry
how to calculate a primary standard buffer using Kh2po4 and Na2Hpo4..
Wednesday, January 9, 2013 at 8:39pm by crazy

Chemistry
You are to prepare a KH2PO4 and Na2HPO4 solution with pH=7.31. What should the concentration of [2(HPO4) 2-] / [H2PO4-]
Saturday, March 16, 2013 at 3:20pm by Pepz

chemistry
Write a net equation for the reaction between aqueous solutions of Na2HPO4 and H2CO3.
Monday, April 26, 2010 at 10:31pm by brad

AP CHEMISTRY
What would be the pH of a solution prepared by combining equal quantities of NaH2PO4 and Na2HPO4? Explain with an equation.
Wednesday, February 15, 2012 at 5:20pm by ERAGON

Chemistry
Calculate the pH of a buffer solution obtained by dissolving 16.0 g of KH2PO4(s) and 27.0 g of Na2HPO4(s) in water and then diluting to 1.00 L. (pKa=7.21)
Thursday, March 29, 2012 at 2:41pm by Jematormal91

Chemistry
How man moles of sodium phosphate are there in 0.4 liters of 0.1M Na2HPO4 (MW=141.96 g/mol)? 2.) How many millimoles in 200 ml?
Sunday, September 15, 2013 at 4:32pm by Kris

Math
I need to equal $1.00 and 30 grams With quarter .25=6 grams dime .10=2 grams nickel .05=5 grams
Thursday, October 16, 2008 at 7:33pm by Corey

chem
when hydrocarbons are burned in a limited amount of air CO as well as CO2 form. When 0.450 grams of a particular hydrocarbon was burned in air, 0.467 grams of CO, 0.733 grams of CO2, and 0.450 grams of H20 were formed. a. What is the empirical formula? I got C2H3! check? b. ...
Friday, August 17, 2012 at 1:19pm by skye

Physics
The masses of 1 mole of various gases are as follows: hydrogen about 2 grams, helium about 4 grams, nitrogen about 28 grams, oxygen about 32 grams and carbon dioxide about 44 grams. On the average how fast does a molecule of each gas move at 333 Celsius?
Tuesday, April 6, 2010 at 2:10pm by Benny

physics
The masses of 1 mole of various gases are as follows: hydrogen about 2 grams, helium about 4 grams, nitrogen about 28 grams, oxygen about 32 grams and carbon dioxide about 44 grams. On the average how fast does a molecule of each gas move at 333 Celsius?
Tuesday, April 6, 2010 at 11:22pm by Plaster

Chemistry
Consider: C6H12)6 + 6O2-> 6CO2 + 6H2O + Energy a)If I have 90 grams glucose and all is consumed by oxygen, then how many grams of water will be produced? b)How many grams of oxygen will be consumed? c)How many grams of sugar will be burned off if 85 grams of O2 is consumed?
Saturday, January 22, 2011 at 5:59pm by Lindsey

Chemistry
How would I make 100mL of a .100 M phosphate buffer with a pH of 7.2 using 1 M NaH2PO4 and Na2HPO4 solid (MW= 142 g/mol)?
Thursday, January 21, 2010 at 10:22pm by Hannah

science
If 1,2,3,4 moles of H3po4, nah2po4, na2hpo4, and na3po4 are mixed in an aqueous solution.find the pH. Ka1=10^-3, Ka2=10^-7, ka3= 10^-13
Sunday, March 30, 2014 at 9:09am by ravi

Statistics
Please help, need advise. Thanks A The amount of pyridoxine (in grams) in a multiple vitamin is normally distributed with = 110 grams and = 25 grams. What is the probability that a randomly selected vitamin will contain less than 100 grams of pyridoxine? B The amount of ...
Wednesday, July 23, 2008 at 8:17pm by Fiza

stat
1. The amount of pyridoxine (in grams) per multiple vitamin is normally distributed with = 110 grams and = 25 grams. A sample of 25 vitamins is to be selected. So, 95% of all sample means will be greater than how many grams?
Wednesday, December 1, 2010 at 7:11pm by Anonymous

chemistry
J. J. Berzelius collected the following data for three reactions: Reaction 1 11.56 grams of lead sulfide, PbS, were formed when 10.0 grams of lead reacted with 1.56 grams of sulfur Reaction 2 11.56 grams of lead sulfide were formed when 10.0 grams of lead reacted with 3.00...
Wednesday, October 9, 2013 at 2:08pm by Brittney

Chemistry
Calculate the amount of NaH2PO4 and Na2HPO4 needed to prepare 100 mL of a buffer with a pH = 8.25 so that the sum of concentrations of HPO4 and H2PO4 ions is 0.5 M. Where do I start? :/
Saturday, October 30, 2010 at 7:29pm by Anonymous

Physics
Four point masses are arranged on the xy plane as follows. Mass1 = 47.0 grams at x = 2.00 cm and y = 2.00 cm. Mass2 = 55.0 grams at x = 0.00 cm and y = 4.00 cm. Mass3 = 27.0 grams at x = -3.00 cm and y = -3.00 cm. Mass4 = 45.0 grams at x = -1.00 cm and y = 2.00 cm. What is the...
Friday, November 8, 2013 at 9:34pm by JAYZ

math
13 cents for A 12 cents for B. total protein greater than twelve grams. Total fat less than eight grams. Total grams less than thirty five grams. .5 grams protein and .3 grams fat for A. .6 grams protein and .2 grams fat for B. what is optimal cost
Tuesday, February 12, 2013 at 8:43pm by Jerome

math
The weights of adult long-tongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will: a) weigh at most 15 grams? b) weigh less than 30 grams?
Wednesday, March 21, 2012 at 7:57pm by becky

Math
The weights of adult long-tongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will: a) weigh at most 15 grams? b) weigh less than 30 grams?
Friday, March 23, 2012 at 2:15am by Becky

Chemistry
A mettallurgist decided to make a special alloy. He melted 30 grams of Au(Gold) with 30 grams of Pb. This melting process resulted to 42 grams of an Au-Pb alloy and some leftover Pb. This scientist wanted to make 420 grams of this alloy with no leftovers of any reactants. how ...
Monday, October 31, 2011 at 8:53am by Eli

BioChem
Write the chemical equation for the reaction that occurs when you add NaOH solution to NaH2PO4/Na2HPO4 buffer solution
Friday, March 23, 2012 at 10:17am by Megan

Science
calculate molarity if H3PO4 from phenolphthalein titre (21ml) assuming it to be dibasic H3PO4 + 2NaOH ---> Na2HPO4 + 2H2O
Tuesday, March 5, 2013 at 6:20pm by Meave

AP CHEMISTRY
Sufficient strong acid is added to a solution containing Na2HPO4 to neutralize one-half of it. what will be the pH of this solution? Explain please
Wednesday, February 15, 2012 at 6:32pm by ERAGON

AP CHEMISTRY
Sufficient strong acid is added to a solution containing Na2HPO4 to neutralize one-half of it. what will be the pH of this solution? Explain please
Wednesday, February 15, 2012 at 6:48pm by ERAGON

PLZ ANSWER CHEM QUESTION
a chemist reacted 64 grams of Ru with O2. This reaction produced 160 grams of ruthenium oxide and 4 grams of leftover O2. How much of the reactants would this scientist need to make 320 grams of the product with no leftover O2? Ru + O2 = RuO2 + O2 leftover
Thursday, November 3, 2011 at 10:29pm by Griffinson

Chemistry
Given this equation: 2P2O5 + 6H2O ---> 4H3PO4. If you begin with 4.8 grams of p2o5 and 15.2 grams h20, what will be your limiting reactant. I got the answer to that and it is P2O5. (6.6 grams) and H2O was 55.2 grams. so the limiting reactant P2O5. Then the next question is ...
Tuesday, February 5, 2008 at 3:09pm by Franki

Chemistrt
How many grams in 4.00 moles of Fe2O3? Answer 4 Moles Mass = 159.7 grams 4 X 159.7/1 = 6.388 or 6.39 grams. How do you get 6.39X102grams? Fe is +2 and O is 2. you have 2-Fe and 3-O why would this not be 6.39X10-2 grams
Sunday, December 6, 2009 at 9:21pm by Paul

Chemistry
If 5.0 grams of Zinc were added to 35.0 grams of H2SO4, how many grams of hydrogen gas would be evolved?
Tuesday, November 19, 2013 at 9:40pm by Elizabeth

chemistry
What happens when 4ml of 1M HCL is added to 100ml buffer made using 5ml 1M Na2HPO4 and 5ml 1M NaH2PO4? The pKa for H+ + HPO4- = H2PO4 is 6.82.
Tuesday, August 17, 2010 at 1:13am by matt

chemistry
if i mix 4 grams of hydrogen and 32 grams of oxygen how many grams of water would be produced
Monday, May 24, 2010 at 2:24pm by kee

Science
How many grams of water must decompose to produce 2 grams of hydrogen and 16 grams of oxygen?
Wednesday, January 23, 2013 at 6:10pm by Anonymous

Chemistry
16.7 grams of chlorine gas are allowed to react with with 3.31 grams of water What is the maximum amount of hydrochloric acid that can be formed in grams
Saturday, December 4, 2010 at 4:05pm by Austin Jekins

Chemistry
If 80.0 grams of methane were reacted with 368 grams of oxygen, how many grams of water would be formed (find limiter first).
Sunday, April 3, 2011 at 7:22pm by Lisa

Chemistry
Question: What mass of water, in grams, would have to be decomposed to produce 17.6 L of molecular oxygen at STP? Work: n=PV/RT x=(1 atm)(17.6 L)/(0.0821)(273 k) x = 1.27348295454546 1.27348295454546 x 2 = 2.54696590909092 Grams= Moles x 18.0 Grams = 2.54696590909092 x 18.0 ...
Wednesday, July 13, 2011 at 10:15pm by Bradley

college chemistry
which of the following combinations is not suitable for making a buffer? h3po4 and nah2po4 na2co3 and nahco3 nh4cl and nh3 nah2po4 and na2hpo4 hclo4 and naclo4
Monday, April 30, 2012 at 1:43pm by Cayla

chemistry
How many grams of water can be made by the reaction of 1.25 grams of ethanol with 2.50 grams of oxygen?
Thursday, April 8, 2010 at 9:22pm by Lacy

Chemistry
The Ka values of H3PO4 are shown below. Ka1 7.5 multiplied by 10-3 Ka2 6.2 multiplied by 10-8 Ka3 4.8 multiplied by 10-13 What is the pH of a 0.14 M solution of Na2HPO4?
Sunday, April 3, 2011 at 1:34pm by George

Chemistry
For the equation below, if 58.6 grams of Al were to react with 540 grams of H2SO4, how many grams of H2 would be produced? 2Al+3H2SO4--->1Al2(SO4)3+3H2
Wednesday, February 2, 2011 at 12:39am by Eva

Math
If a food item weighs 120 grams and its composed of 77 grams of carbhydrates, 19 grams of fat, and 24 grams of protein, what is its total calorie count? Carbs and protein each provide each provide 4 calories per gram and fats provide 9. Thanks for all who will help.
Monday, March 12, 2012 at 3:41pm by Dee

chemistry
A mixture containing 50grams of carbon and 75 grams of oxygen is sealed in a flask. The total mass of the system is 225 grams. The flask is heated to cause the carbon and oxygen to react. The sealed flask is massed. What is the mass of the sealed flask? A) 125 grams B) 150 ...
Monday, January 20, 2014 at 8:29pm by steve

chemistry
Phosphoric acid is a triprotic acid, so H3PO4, H2PO4 -, and HPO4 2- are all acids. Which of the solutions below would have the lowest pH? 0.1 M NaH2PO4 0.1 M Na2HPO4 0.1 M Na3PO4
Monday, March 10, 2014 at 3:12pm by bob

Chemistry
For the balanced equation shown below, if 40.1 grams of C2H3O2Br were reacted with 8.01 grams of O2, how many grams of H2O would be produced? 2C2H3O2Br+O2->4CO+2H2O+2HBr Thank you!
Thursday, March 3, 2011 at 8:29pm by Lelu

Chemistry
For the balanced equation shown below, if 40.1 grams of C2H3O2Br were reacted with 8.01 grams of O2, how many grams of H2O would be produced? 2C2H3O2Br+O2->4CO+2H2O+2HBr Thank you!
Thursday, March 3, 2011 at 8:29pm by Lelu

chemistry
What are the accepted values for the number of moles of NaCl that are produced from HCl and the following various amounts of grams of NaHCO3; 0.25 grams 0.5 grams 1 gram Please Help!
Thursday, March 1, 2012 at 7:22pm by Sharon

chemistry
how many grams of water can be formed when 28.7 grams of CH4 reacts with 45.8 grams of O2
Thursday, December 16, 2010 at 8:23pm by mickey

chemistry
how many grams of water can be formed when 28.7 grams of CH4 reacts with 45.8 grams of O2
Thursday, December 16, 2010 at 8:25pm by mickey

chemistry
Suppose you mix 50 grams of CO and 10 grams of H2. How many grams of methanol can be produced?
Thursday, July 26, 2012 at 7:57am by james

Chemistry
How many grams of HgBr2 can be produced if 10.0 grams of Hg reacts with 10 grams Br2
Tuesday, January 29, 2013 at 10:42pm by Chris

chemistry
How many grams of ZnCl2 will be produced from 48 grams of zinc and 30 grams of HCL
Tuesday, March 26, 2013 at 7:27pm by walter

ap chemistry
What pressure would a mixture of 3.2 grams of O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 5.1 liter container at 127C? Answer in units of atm
Saturday, February 9, 2013 at 7:55pm by cheri

Chemistry
Given the following equation: Na2O + H2O ---> 2 NaOH. How many grams of NaOH is produced from 1.20 x 10^2 grams of Na2O? How many grams of NaO2 are required to produce 1.60 x 10^2 grams of NaOH?
Wednesday, March 21, 2012 at 11:42pm by Carl

Chem
For the following reaction, 21.7 grams of diphosphorus pentoxide are allowed to react with with 13.1 grams of water. What is the maximum amount of phosphoric acid that can be formed in grams? What is the FORMULA for the limiting reagent? What amount of the excess reagent ...
Sunday, May 15, 2011 at 2:35pm by moose

AP Chemistry
What pressure would a mixture of 3.2 grams of O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 4.1 liter container at 127 degrees C? Answer in units of atm
Sunday, February 16, 2014 at 6:53pm by Gabriella

ap chem
you have 1.00 liter each of 0.10 M Na3PO4, Na2HPO4, NaH2po4 ka 1= 7.5*10^-3 ka2=6.2*10^-8 ka3=4.8*10^-13 a) prepare 500 ml of a buffer with PH= 7.6 b) how much 0.10 M HCL must be added to the 500ml of buffer to result in a PH=7.2 after the addition?
Wednesday, May 30, 2012 at 10:27pm by cat

College Chemistry
What is pH buffer of 0.1 mol L-1 Na2HPO4/O.15 mol L-1 KH2PO4? KH2PO4? Given Ka(H2PO4-) = 6.2 x 10-8). I would like to know the correct formula, steps for the answer Thank you
Wednesday, October 20, 2010 at 10:43pm by Helen

Chemistry(URGENT!)
determine whether the following salts will form acidic, neutral or basic solutions in water. Na2HPO4 CaNO2 NH4CH3COO Al2SO4 NaF Please, i need the answer to this question within 2 hours of when i post this!
Wednesday, July 28, 2010 at 4:59am by rick

Statistics
A particular fruit's weights are normally distributed, with a mean of 308 grams and a standard deviation of 31 grams. The heaviest 9% of fruits weigh more than how many grams? Give your answer to the nearest gram.
Tuesday, April 12, 2011 at 11:27am by Sarah S-Help!

Science
What is the mass (in grams) of water that is produced when 100.0 grams of nitrogen monoxide is reacted with 75.0 grams of hydrogen according tho the following balanced eguation? 2NO + 5H2 = 2NH3 + 2H2O
Thursday, August 4, 2011 at 11:33am by David

chemistry
2 moles of aqueous Barium Nitrate is combined with 1 mole of aqueous Sodium Sulfate. Assuming 100% yield, what mass of Barium Sulfate precipitate would be produced. 1. 175.043 grams 2. 233.391 grams 3. 466.781 grams 4. 116.953 grams
Friday, October 21, 2011 at 10:51pm by chelsy

College Chemistry
What is pH of the buffer 0.1 mol L-1 Na2HPO4/0.15 mol L-1 KH2PO4? (Given Ka(H2PO4-)=6.2x10 power-8). Sorry if the power is confusing. My computer does not have the symbol. Thanks
Friday, October 22, 2010 at 1:19am by Elleni

Chemestry
A 1L of buffer was prepared from 0.15 mole of Na2HPO4 and 0.10 moles KH2PO4. a) What is your pH and what is the pH change that adding of 80.0 mL of 0.100 mol L-1 NaOH cause? b) What happen to the pH after adding 10.0 mL of 1.0 mol L HNO3-1.
Thursday, April 28, 2011 at 10:43am by Margo

Chemistry
Calculate the change in pH if 0.050 g of solid NaOH is added to 250 mL of a buffer solution that contains 0.80 M NaH2PO4 and 0.17M Na2HPO4. I found the pH of the buffer solution to be 6.54.
Thursday, April 4, 2013 at 6:36pm by Matt

Chemistry
Assign oxidation states to all atoms in each of the following. explain the order in which you determine the oxidation states for each element if applicable. a)O2 b)HSO4- c)Na2HPO4 d)CrCl3
Sunday, April 21, 2013 at 1:09am by Juan

Chemistry
16.7 grams of chlorine gas are allowed to react with with 3.31 grams of water What is the maximum amount of hydrochloric acid that can be formed in grams. What is the maximum amount of hydrochloric acid that can be formed? grams What is the FORMULA for the limiting reagent? ...
Saturday, December 4, 2010 at 4:31pm by Austin Jekins

chemistry
8. If x grams of S are needed to obtain 0.4 grams of SO3, how many grams of SO2 can be obtained from the same amount of S? (A) 0.32 g (B) 0.62 g (C) 0.40 g (D) 0.16 g (E) Can not be calculated from the given data. I am not sure how to set up this problem. I calculate the ...
Monday, December 20, 2010 at 9:54am by Anna

Chemistry
Assume that a reaction occurs in which unknown substances R and S react to form unknown substances T and U. From the information below, determine the mass of substance T that will be formed if 45.0 grams of substance R reacts with 23.0 grams of substance S. (Assume that the ...
Tuesday, May 20, 2008 at 8:07pm by Daniel

Chemistry
Determine the volume (in mL) of 0.844 M hydrochloric acid (HCl) that must be added to 38.0 mL of 0.650 M sodium hydrogen phosphate (Na2HPO4) to yield a pH of 6.92. Assume the 5% approximation is valid and report your answer to 3 significant figures. Look up pKa values.
Wednesday, March 9, 2011 at 12:54pm by Colin

chemistry
I need to find how many grams phosphorus (P) are in 0.8645 g sample of MgNH4PO4 x 6H2O How many grams P2O5 can be calculated with this many grams of P What is the percent P (as P2O5) in this
Monday, June 14, 2010 at 10:11pm by Jamie

problem solving
You purchased 18 karat gold chain that weights 15 grams. How much gold did you purchase in grams? In carats? (1 carat=0/2 grams)
Tuesday, December 11, 2012 at 12:53pm by ben

Chemistry
!00.0 grams of Na2SO4 reacts with 150.00 grams of Ba(NO3)2to form NaNO3 and BaSO4. How many grams of barium sulfate will form?
Friday, March 8, 2013 at 12:47pm by David

math
Is a glass of water equal to 30 grams or 300 grams? More likely 300 grams. 30 grms would be nearly two tablespoons.
Wednesday, April 4, 2007 at 7:56pm by dan

chemistry
What is the maximum number of grams of PH3 that can be formed when 6.2 grams of phosphorus reacts with 4.0 grams of hydrogen to form PH3? P4+6H2-->4PH3. how do i do this question
Tuesday, June 10, 2008 at 8:36pm by Miley

Physical Science
1. Which equation correctly shows beta decay? (A) 210/82 Pb -> 209/81 Tl + 0/-1 e + y (B) 210/82 Pb -> 209/83 Bi + 0/-1 e + y (C) 210/82 Pb -> 210/83 Tl + 0/-1 e + y (D) 210/82 Pb -> 210/83 Bi + y (E) 210/82 Pb -> 210/83 Bi + 0/-1 e + y 2. The half-life if radon...
Monday, November 18, 2013 at 2:27pm by CJ

math
Kittens weigh about 100 grams when born and gain 7 to 15 grams per day. If a kitten weighed 100 grams at birth and gained 8 grams per day, in how many days will the kitten triple its weight?
Wednesday, October 23, 2013 at 6:08pm by Brittney

chemistry
If 7.50 grams 1-butene reacts with 25.0 g oxygen how many grams of carbon dioxide will form? Which reactant is limiting? How many grams of excess reactant will be left at the end of the reaction?
Thursday, November 4, 2010 at 12:07am by rosa

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