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April 21, 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: 12,452

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

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

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
Na2HPO4 + HI ==> NaI + NaH2PO4. This is a double displacement (double replacement) reaction. One Na on Na2HPO4 changes places with the H of HI. That's all that happens. So Na2HPO4 becomes NaH2PO4 and the HI becomes NaI.
Sunday, July 1, 2012 at 10:23pm by DrBob222

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
Check the problem and be careful with the caps. Na2PO4^2- doesn't exist. It could be Na2PO4^-. It might be Na2HPO4 and the equation would be Na2HPO4 + HI ==> NaI + NaH2PO4 for which the net ionic equation is HPO4^- + H^+ ==> H2PO4^-
Sunday, July 1, 2012 at 10:23pm by DrBob222

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
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

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
pH = pK2 + log (base/acid) I looked up pK2 and found 7.2; therefore, 7.2 = 7.2 + log (base/acid) so (base/acid) = 1 If we used 100 mL of the 1 M NaH2PO4, that is 1 M for the concn of acid. If we used 0.1 mole Na2HPO4 in 100 mL that is 0.1 mole/0.1 L = 1 M so the ratio is 1. 0....
Thursday, January 21, 2010 at 10:22pm by DrBob222

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
It will take 10 mmols NaOH to convert 10 mmoles H3PO4 to NaH2PO4 and another 10 to convert to Na2HPO4 plus 5 mmoles to convert 5 mmole NaH2PO4 to Na2HPO4. That's a total of 25 mmoles needed. You hav e 0.1M NaOH, M = mmoles/mL. Substitute and solve for mL. NOTE: it's ...
Sunday, November 20, 2011 at 11:32am by DrBob222

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

Chemistry
First, you made an error before you get to that part. grams O = 2.00-grams C - grams H. You subtracted grams CO2 and grams H2O. Your grams C (and moles) is ok as is the grams H (and moles H) but the oxygen must be redone.
Monday, October 17, 2011 at 9:21pm by DrBob222

Chemistry
for part a I tried using the HH equation, found moles of NaOH and used that for [base] and moles Na2HPO4 as [acid]...i used pKa 7.21...that was incorrect. For part b I used a similar method...plugging in HNO3 as the [acid] and Na2HPO4 moles as [base] the other pka values for ...
Tuesday, March 16, 2010 at 11:52pm by Trixie

Analytical Chemistry
pH=pka+log({A-]/[HA]) pH=7.45 pka=12.375 Solve for ratio: 10^(7.45-12.375)={A-]/[HA]=1.19x10^-5 Since you have a total of 0.01 moles, 1.19x10^-5*(0.01moles)= moles of Na2HPO4 0.01 moles-moles of Na2HPO4= moles of NaH2PO4 Use the formula weights to solve for the number for each...
Friday, February 22, 2013 at 7:05pm by Devron

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

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

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

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

Chemistry
I expect the Na2HPO4 is a buffering agent. Fe^3+ + SCN^==> FeSCN^2+
Monday, February 4, 2013 at 12:08am by DrBob222

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

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

chemistry
The reaction between the added solid and NaOH is: NaH2PO4 + NaOH --> Na2HPO4 + H2O 10.0gNaH2PO4 /120.0g/mol = 0.0833 moles NaH2PO4 initially. In the rection, the limiting reactant is NaOH. (0.150 L)(0.20 mol/L) = 0.030 mol NaOH 0.030 moles of NaOH ---> 0.030 moles ...
Wednesday, October 7, 2009 at 8:55pm by GK

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

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

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

chmistry
You omitted the units of 3.2? Is that 3.2 grams? If so, read on. If not, the following is not correct. So you have 6 + 1 + 1 total = 8 parts of which 6/8 is KNO3, 1/8 is C and 1/8 is S. 3.2 x (6/8) = 2.4 grams KNO3. 3.2 x (1/8) = 0.4 grams S. 3.2 x (1/8) = 0.4 grams C. Now ...
Tuesday, October 27, 2009 at 12:46am by DrBob222

adult education
A Chemist weighed three separate test at 0.17 gram, 0.204 gram, and 2.3 grams. What is total weight of the three samples? A. 2.44 grams B. 2.521 grams C. 2.674 grams D. 3.97 grams
Saturday, February 20, 2010 at 7:36pm by sabrina

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

Chemsitry
A chemist needs to make 50 mL buffer solution with a pH value of 7.25 using the acid/conjugate base pair of KH2PO4 and Na2HPO4 (which has an effective pKa = 6.86). The buffer solution needs to be made so that the total concentration of buffer is 0.10 M (that is, [acid] + [base...
Monday, April 2, 2012 at 11:39pm by Cassandra

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

Biochemistry
mg/1000 = grams. grams/100 x 10 converts to grams/L. grams/molar mass converts grams to moles. Now you have moles/L.
Tuesday, September 1, 2009 at 9:08pm by DrBob222

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

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

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

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

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

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

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
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

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

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

tere
a is ok b is ok c should be 2 x 0.24 = 0.48. NaNO3 ionizes into Na^+ and NO3^-. I don't know what Na2PO4 is. Na2HPO4 will ionize to 2Na^+ and HPO4^-2 (three particles). And that makes a the winner.
Saturday, October 16, 2010 at 3:55pm by DrBob222

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

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

chemistry
I think maybe you better look up the solubility which is normally in grams or mols per liter but 36 grams in 100 grams is much higher than believable by any stretch of the imagination. A liter of fresh water is about a 1000 grams.
Saturday, March 8, 2014 at 2:03pm by Damon

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

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
you are right. It is Na2HPO4 + HI ==> NaI + NaH2PO4 for which the net ionic equation is HPO4^- + H^+ ==> H2PO4^- Can you explain how to get this, though? any steps would be helpful.
Sunday, July 1, 2012 at 10:23pm by Nancy

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

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- Empirical Formula
Yes and no. Yes, you can convert 6.63 mg to grams, go through the calculation and convert grams back to mg but I didn't convert in the first place so I had no reconverting to do. Another way is to convert 6.63 mg to grams, go through the calculation and have the answer for H ...
Monday, April 19, 2010 at 9:36pm by DrBob222

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

Chemistry 106
moles = grams/molar mass. Convert 1.50 kg to grams = 1,500 grams.
Monday, October 18, 2010 at 8:22pm by DrBob222

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
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
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

ap chem
so is this correct: 3330000 grams CH4 0 grams O2 1770833 grams NH3
Monday, October 11, 2010 at 9:11pm by Emma

ap chem
so is this correct: 3330000 grams CH4 0 grams O2 1770833 grams NH3
Monday, October 11, 2010 at 9:11pm by Emma

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

College Chemistry
150 grams of aluminum,250 grams of iron, 350 grams of lead?
Monday, February 13, 2012 at 6:42pm by Wanda

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

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

College Chemistry Help Please!
if i have 1.00 grams of N2 in 0.180 grams of H2 how many grams of NH3 is produced
Tuesday, November 9, 2010 at 2:04pm by nicklas

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
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

9th grade
Convert milligrams to grams to make it easier: 1 milligram = 0.001 gram Convert kilograms to grams as well so you have the same units: 1 kilogram = 1000 grams Divide kilograms (1000 grams) by milligrams (0.001 grams) to get your answer.
Thursday, December 10, 2009 at 6:45pm by Emily

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
a. 19 grams b. 20.71 grams c. 2637.42 grams
Sunday, February 13, 2011 at 9:06am by no name

9th chemistry
so how do i know which one is correct? If i understand correctly you said it could be Na2HPO4 or NaH2PO4... also i don't understand how there can be +1 Na and then a -3 PO4... wouldn't it then have to be Na3 to balance? sorry i'm really lost
Friday, January 2, 2009 at 9:35pm by alexa

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
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

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

Chemistry
moles = grams/molar mass 0.25 = g/16 and grams = 0.25 x 16 = 4 grams. The equation as written is 2 moles CH4 so that is 16 x 2 = 32 grams. 177 kJ (for the reaction for the 4 grams) x (32/4) = ??
Thursday, March 18, 2010 at 8:19pm by DrBob222

Chemistry
You want to use the Henderson-Hasselbalch equation. Substitute into pH = pKa + log[(base)/(acid)]. The base is Na2HPO4. The acid is NaH2PO4.
Wednesday, July 6, 2011 at 11:13am by DrBob222

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

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

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

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
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
1. Use: mass = (volume)*(density), or grams = (milliliters)(grams/ml) to calculate the mass (grams) of each compound. 2. Find the molar mass of toluene. 3. Divide the mass (grams) of toluene by the molar mass of toluene to convert grams to moles. 4. Convert the grams of ...
Friday, August 15, 2008 at 5:17pm by GK

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
How many moles do you need for the final solution? That is M x L = moles = 0.03M x 0.050L = ? So you need ? moles AgNO3. How many grams is that? That is g = moles x molar mass = x grams. So your solution is 51 g/L. How many L must you take to arrive at x grams. That will be 51...
Monday, January 30, 2012 at 12:03am by DrBob222

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

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

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

analytical chemistry
How many moles do you want? That's M x L = mols. How many grams is that? That's mols = grams/molar mass. Calculate grams. Weigh the grams, add to the 200 mL volumetric flask, add some water, swish to dissolve the solid, make to the mark with distilled water and mix thoroughly.
Saturday, February 15, 2014 at 3:59pm by DrBob222

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

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