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December 7, 2016

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chemistry
how many grams of CH4 (methane) must be burned to form 82.6g of H2O? equation: CH4+O2----> CO2+H2O
January 16, 2014 by frances

chemistry
how many grams of CH4 (methane) must be burned to form 82.6g of H2O? equation: CH4+O2----> CO2+H2O
January 16, 2014 by jocelyn

Chemistry
How many grams of a 17.7% potassium sulfate solution would contain 419.9 g potassium sulfate? Answer in units of g
March 13, 2014 by Kristen

Chemistry
How many grams of HCl are needed in order to make 0.500 liters of a 0.100 M HCl solution? 1.82 g 18.2 g 0.500 g
June 6, 2014 by Anonymous

chemistry
Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of B2O3 are made by the reaction of 233.8 g of O2
November 16, 2014 by michelle

chemistry 113
How many grams of sodium sulfate do you need to create 750 mL of a 0.250 M solution of sodium sulfate
January 24, 2015 by ALEX GOLD

chemistry
what mass of carbon, in grams, can be consumed by 44 g oxygen in in combustion to give carbon monoxide/ what mass of CO is produced?
March 19, 2015 by Aman

chemistry
If 9.00 g of _27^60 Co (half-life = 5.30 y) are allowed to decay, how many grams would be left after 1.00 y and after 10.0 y? g after 1.00 y g after 10.0 y
April 23, 2015 by tarsa

chemistry
you are given a sample mass of 250g compound that is 45% water. How many grams of water can be recovered from the sample by dehydration?
May 19, 2015 by rish

chemistry
How much heat must be removed from 75.0 grams of water at 90.0 degrees Celsius to cool it to 23.0 degrees celsius?
April 26, 2016 by Hope

Chemistry
How many grams of sodium sulfate na2so4 must be added to make 500ml of a 12.5 M sodium sulfate solution
May 10, 2016 by Jessie

Math
A cup of cereal has 1212 grams of fiber, which is 40%40% of the recommended daily allowance. What is the recommended daily amount?
September 21, 2016 by Boo

chemistry
how many grams of potassium nitrate are needed to prepare 250.0ml of a 0.03M potassium nitrate solution?
November 12, 2016 by jen

chemistry
what is the maximum amoutn of KCL that can dissolve in 200 gram of water? ( solubility of KCL is 34 grams/100 gram H2O at 20 celsius
June 10, 2008 by Miley

Chemistry
I need to figure out how many moles are in 16.0 grams of sulfur dioxide. I know that sulfur dioxide is SO2 so do I do I do? Do I find the molar mass first?
November 4, 2008 by Sarah

CHEM
How many grams of water and iron must react to produce 543 g of iron oxide, Fe3O4? 3Fe + 4H2O---> Fe3O4 + 4H2
August 3, 2009 by Christian

Chemistry
The following reaction represents the decomposition for water: 2H2O - 2H + O How many molecules of hydrogen are produced from the decomposition of 12.2 grams of water into its elements?
March 25, 2010 by Stacey

nutrient
you determine that 1 ounce of the peanut butter container contains 115 calories and 9 grams of fat. What percent of the calories come from fat?
April 15, 2010 by Nika

Chemistry
explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
May 5, 2010 by Jenifer

chemistry
explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
May 5, 2010 by Jenny

Chemistry
When heated, lithium reacts with nitrogen to form lithium nitride: 6Li+N2 --> 2Li3N What is the theoretical yield of Li3N in grams when 12.4 g of Li is heated with 33.9g of N2
June 12, 2010 by Jerry

Chemistry
The water vapor pressure at 25 degrees celsius is 23.76 torr. If 1.25 grams of water is enclosed in a 1.5 L container, will any liquid be present? If so, what mass of liquid?
September 28, 2010 by Kay Pham

IPC
The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?
October 12, 2010 by Katy

chemistry
How many grams of potassium formate, KHCOO, must be added to 500 mL of a .07 M solution of HCOOH to produce a buffer solution with a pH of 3.50? given: Ka of HCOOH=1.8 x 10^-4
November 13, 2010 by Audrey

CHEM
a cyinder with a volume of 5.37 liters contains N2 at a pressure of 2.82 atm at 26 celcius. how many grams Ne must be added to raise the total pressure to 7.5 atm
November 20, 2010 by MAX

Chemistry
Given the following reaction: HCl(g) + SrO(s) ¨ SrCl2(s) + H2O Calculate the mass of HCl in grams that would react with 11.44 kg SrO.
November 25, 2010 by andrea

Chemistry
How much heat in kJ is required to melt 54 grams of ice at 0 degrees C into water at 0 degrees C if delta Hvap for water = 6.01 kJ/mol?
December 14, 2010 by Hannah

Chemistry
Given the following two step reaction: 4 P + 5 O2 -> P4O10 P4O10 + 6 H2O -> 4H3PO4 If you have 8.28 g of P, 15.65 g of O2, and 19.95 g of H2O, how many grams of H3PO4 can be produced?
June 30, 2011 by Bradley

Chemistry
You have 250 mL of a 0.80 M solution of silver nitrate AgNO3 (169.87 g/mol) dissolved in water. How many grams of AgNO3 does the solution contain?
October 17, 2011 by sara

chemistry
How many grams of NH4Cl must be added to 0.490 L of 1.70 M NH3 solution to yield a buffer solution with a pH of 9.40? Assume no volume change. Kb for NH3 = 1.8 10-5.
October 26, 2011 by kelly

chemistry
. How many grams of H2SO4 (98.1 g·mol-1) are required to react with 4.0 g NaOH (40.0 g·mol-1) in this neutralization reaction?H2SO4 + 2NaOH  Na2SO4 + 2H2O a. 2.4 g b. 4.9 g c. 9.8 g d. 20 g
December 11, 2011 by anonymous

chemistry
how many grams of potassinum nitrate are produced from 81.6kg of potassinum chloride and 40.8 kg of hydrogen nitrate? 4KCl+4HNO3+O2------- 4KNO3+2Cl2+2H2O
February 26, 2012 by rk

Chemistry
A solution contains 0.55 g of dissolved Sn 4+ ions. How many grams of Na2CO3 must be added to the solution to completely precipitate all of the dissolved Sn4+?
April 23, 2012 by Anna

Chemistry
A solution contains 1.50 g of dissolved Pb 2+ ions. How many grams of NaI must be added to the solution to completely precipitate all of the dissolved Pb 2+ as PbI2?
April 24, 2012 by annabel

chemistry
How many grams of hydrogen can be prepared by treating 2.63 g of iron with 130.0 mL of 1.50 M sulfuric acid solution, to give iron(III) sulfate and hydrogen?
September 30, 2012 by sarah

A.P. Environmental Sciences
.5 grams of pure copper sulfate powder and 2L of water were used to create a copper sulfate solution with a concentration .5ppm. How was this done?
October 10, 2012 by Michelle

chemistry
CaO + C --> CaC2 + CO2 [unbalanced] If 244 g of CaO is combined with 318 g C, how many grams of CO2 could be produced if the reaction goes to completion?
November 5, 2012 by Sheree'

Chemistry
2AgNO3 + BaCl2 --> 2AgCl + Ba(NO3)2 How many grams of sliver chloride are produced from 5.0g of sliver nitrate reacting with an excess of barium chloride?
March 13, 2013 by Christie

science
The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?
June 5, 2013 by Quan

Chemistry II
An analgesic mixture is 37.5% aspirin by mass. How many grams of the mixture are needed to provide 325 mg aspirin. Make sure to show your work.
August 26, 2013 by Krista

Chemistry
When 4.76 g of a solid mixture composed of NH4Cl and CaCl2 was dissolved in 100.0 mL of water, the temperature of the water rose by 4.73°C. How many grams of each substance was in the mixture?
June 26, 2014 by Luke

nutrition
How many grams of fat would you have to eat if you want your diet to be one in which 30% of your calories come from fat, and your caloric intake is 2000 calories?
September 12, 2014 by TayB

Chem 130
How many grams of the adipic acid (C6H10O4) could form from the reaction of 15.00 g of cyclohexane (C6H12) with the 25.00 g of oxygen? Will the formula be... 2O2 + C6H12 ---> C6H10O4
November 3, 2014 by michelle

math
An atom of gold has a mass of approximately 3.25 × 10−22 grams. What is the mass of 7000 atoms of gold? Express your answer in scientific notation
November 12, 2014 by jahron

AP Chemistry
If a saturated solution of Potassium Chlorate at 80 degrees celsius cools to room temperature (25 degrees celsius), how many grams of crystals form?
December 31, 2014 by Alexandra

Chemistry help
given 2.01x10^23power molecules of carbon dioxide, how many moles of co2 do you have? How many grams of carbon dioxide would this be? I need help!!
February 25, 2015 by Anonymous

chemistry
How many grams of MgCl2 is needed to make 1200ml of a .25M solution? .25M/L* 1200mL/1* 1L/1000mL* 95.211:-/ mol I got 28.563g
April 13, 2015 by sarah

chmistry
For the following equation, how many grams of NO2 can be formed from 2.50 g of CuO mixed with 0.500 L of NO gas at 25 C and 1.12 atm. ? 2 CuO (s) + NO (g)  Cu2O (s) + NO2 (g
August 26, 2015 by Anonymous

Chemistry
To prepare 500.00 mL of 0.300 M buffer with a pH of 7.4. NaH2PO4/Na2HPO4 How many grams of each should be added to the 500.00mL flask to create this buffer?
September 8, 2015 by Josh

Chemistry
A 453 mL solution has a chloride concentration of 0.0253 M. This solution was prepared by adding solid FeCl3 to water. How many grams of FeCl3 are required?
October 5, 2015 by Kim

science
If 0.188 moles of zinc reacts with excess lead(IV) sulfate, how many grams of zinc sulfate would be produced in the following reaction?
November 3, 2015 by Anonymous

science
If 0.188 moles of zinc reacts with excess lead(IV) sulfate, how many grams of zinc sulfate would be produced in the following reaction?
November 3, 2015 by Anonymous

Chemistry
4.80 L of N2, at 25 ∘C and 1.22 atm , is mixed with 1.80 L of O2, at 25 ∘C and 0.122 atm , and the mixture allowed to react. N2(g)+O2(g)→2NO(g) How much NO, in grams, is produced?
November 6, 2015 by Ethan

Math/dosage
A 7(1/2)% strength solution has been prepared. a) How many grams of medication are in the 7(1/2)% strength solution how do I setup this question? Is this correct? 7(1/2)/100 = x/100mL
February 24, 2016 by John

Chemistry
The balanced reaction equation for the combustion of heptane, C7H16, is given below. If the reaction produced 37.5 g CO2, how many grams of heptane were burned?
February 25, 2016 by Veronique

chemistry
when heated, kclo3 decomposes into kcl ad 02. 2kclo3--> 2kcl+3o2 if this reaction produced 61.7 g of kcl, how much o2 was produced (in grams)?
August 10, 2016 by AA

Chemistry
How many significant figures in total do you have to use when using the electronic balance that has accuracy up to three figures after the decimal point that you used in the lab, to weigh a sample that is less than 10 grams.
September 9, 2007 by Heather

chemistry
Gaseous arsine reacts according to the balanced equation. If a total of -3663 KJ of heat is produced in the reaction as written, how many grams of AsH3 are consumed? (Enthalpy= -1867.2) 2 AsH3(g) + 3 O2(g) --> As2O3(s) + 3 H2O(l)
February 27, 2008 by Anonymous

chemistry
If 6.4 grams of KOH crystals are palced within 1.5 L of water(distilled), and after 2 days several crystals are still visible, what is the condition of the system?Is it saturated,closed,unsaturated,open or supersaturated? Thank you
April 4, 2008 by Jenny Q

chemistry
Gaseous carbon monoxide reacts according to the balanced equation. If a total of 1040 kJ of heat is generated in the reaction as written, how many grams of CO2 are produced? enthalpy=-566kJ 2 CO(g) + O2(g) → 2 CO2(g)
February 25, 2010 by eng

chemistry
If 11.53g hydrogen sulfide reacts with 3.97g oxygen gas in the following reaction: 2H2S + O2 + H2O which is the maximum mass of sulfur that can be produced? which is the limiting reactant ? which reactant is in excess ? by how many grams?
May 23, 2010 by Charile

chemistry
How many grams of FeCl2 should be dissolved in 1 kg of water to make its boiling point equal to 101.56 degrees centrigrade at atmospheric pressure of 1 atm? (Kb=0.52 degrees Celsius/m; solute is completely dissociated). Thanks!! =)
July 18, 2010 by el

physics
A ball of mass 200 grams is whirled in a circle at the end of a strong 100 cm long rope whose breaking strength is 10 N. Neglecting gravity, the maximum speed of the ball is approximately.
September 11, 2010 by Brittany

Chemistry- Buffers
a buffer is prepared by mixing .208 L of 0.452 M HCl and 0.5 L of 0.4 M sodium acetate. When the Ka= 1.8 x 10^-5 I figured out that the pH= 4.74 but then it asks how many grams of KOH must be added to the buffer to change the pH by .155 units?
December 5, 2010 by Mikey

Chemistry
Consider the following chemical equation. MnCl2(s) + H2SO4(aq) → MnSO4(aq) + 2 HCl(g) How many grams of manganese(II) chloride must react with sulfuric acid to release 50.0 mL of hydrogen chloride at STP?
December 5, 2010 by Kalen

chemistry
10.2 g of Pb(NO3)2 are dissolved in 100 mL of water, and added to 250.0 mL of a 0.250 M solution of KI. Determine the mass in grams of Pbl2 produced, and find the number of moles of the excess reagent. PLZ explain
December 13, 2010 by Lisa

chem
How many grams of magnesium oxide are formed when 13.5 L of oxygen gas, measured at STP, completely reacts with magnesium metal according to the following reaction? i got .496 g but i know that like way off
February 17, 2011 by hannah

Chemistry
What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution? Show all of the work needed to solve this problem.
March 21, 2011 by ilyrae

physics
You have an inclined plane. It is 2m long and 1m high. A cylinder of mass 300 grams and 3cm radius is initially at rest at the top of the hill. What is its angular velocity when it reaches the bottom of the hill?
April 6, 2011 by Lakeshia

Chemistry
How many grams of KNO3 are needed to make 450 mL of a solution that is to contain 5.50 mg/mL of potassium ion? Calculate the molarity of the solution. ______g ______M i honestly don't know where to start, but i know that M=mol/L will be involved somewhere... Please help...
May 10, 2011 by Sam

chemistry 101
Given the following dissolving process: Fe2(SO4)3 (s) = 2Fe3+ (aq) + 3SO42- (aq) How many grams of iron (III) ions are produced when 0.450 moles of sulfate ion are produced? options: 50.3 g 16.8 g 50.3 g 37.7 g 75.4 g
July 8, 2011 by ABCD

Chemistry
In this balanced equation 4Al + 3O2 = 2Al2O3. When 0.54 mole aluminum is reacted in a closed container with 7.80 g oxygen, how many grams of aluminum oxide can form. Please show steps to work out. Thanks
July 16, 2011 by Pamela

AP CHEMISTRY
Calculate the solubility of LaF3 in grams per liter in the following solutions. (Ksp = 2. 10-19.) a) pure water Ans: .00182g/L b) 0.037 M KF solution c) 0.055 M LaCl3 solution NEED b&c PLEASE HELP
March 13, 2012 by HELP PLEASE

penketh high
Laughing Gas, N2O, is made by the careful decomposition of ammonium nitrate NH4NO3 (s) = N20 (g) + 2H20 (g) How many grams of N2O can you obtain? How many dm3 of stream would also be produced?
November 18, 2012 by christy

Chemistry
When a sample of NH3(g) (296.5 grams) is placed in 140.0 L reaction vessel at 676.0 °C and allowed to come to equilibrium the mixture contains 6.250 mol of N2(g). What is the concentration (mol/L) of H2(g)? 2NH3(g) = N2(g)+3H2(g)
October 4, 2013 by plzprovidetheanswer

Chemistry
excess magnesium is reacted with 45 grams of sulfuric acid. 9.5 liters of hydrogen gas are collected understand conditions of temperature and pressure. what is the percentage of hydrogen sulfate and of water in the acod solution?
March 28, 2014 by Anonymous

physics
Calculate the magnitude of the force if a ball of mass 249.9 grams, and initial velocity +16.5 m/s is struck back on the same path with a final velocity of -22.0 m/s. Assume the contact time is 3.1 milliseconds. Use 2 s.f.
June 9, 2014 by allen

Chemistry
Assume that you start with 2 mole(s) of magnesium metal, determine: The number of grams of MgO(s) that would be produced in the following reaction (enter your answer with 4 significant figures): Mg(s) + 1/2O2(g) → MgO(s)
October 11, 2014 by Meechel

Chemistry
How many grams of potassium nitrate (KNO3) are required to produce 536 g of potassium nitrite (KNO2) according to the equation below? *I've tried this question for so long and I get so many different answers in the end so please help.
April 20, 2015 by Jo

Science
1. Which skill involves creating representations of complex objects or processes A. Classifying B. Predicting C. Making models D. Evaluating 2. The mass of an object is described in what A. Meters B. Cubic meters C. Liters D. Grams
September 10, 2015 by Serenity

chemistry
How many grams of copper is deposited from an aqueous solution of copper sulfate, (CuSO4(aq)), by passing one mole of electrons into a copper plating cell? A. 254g B. 127g D. 42.3g E. 31.8g
May 24, 2008 by Mable

chemistry
How many grams of copper is deposited from an aqueous solution of copper sulfate, (CuSO4(aq)), by passing one mole of electrons into a copper plating cell? A. 254 g B. 127 g C. 63.5 g D. 42.3 g E. 31.8 g
May 24, 2008 by Rapinder S.

Physics
Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!
June 8, 2010 by Amal

Physics
Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!
June 8, 2010 by Amal

Chemistry
Determine how many grams of active antacid ingredient AL(OH)3 would be necessary to neutralize the HCL in 50.0 mL of .0100 M HCL (an approximation of the conc. of HCL in the stomach) 3HCL9aq)+AL(OH)3(s)-> AlCL3 (aq) = 3H2O (L)
June 7, 2011 by Vinny

Science
How much heat is absorbed by a persons hand if 100 grams of steam at 100°C is first converted to liquid water at 100°C and then cooled to normal body temperature?
July 13, 2011 by Anonymous

chemistry
A dilute aqueous solution of CaCl2 contains 0.159 grams of solute per liter of solution. It is fully dissociated. What is the osmotic pressure of the solution against a membrane at 20.0 °C?
September 29, 2011 by sarah

chemistry
5. The industrial production of hydroiodic acid takes place by treatment of iodine with hydrazine (N2H4): 2I2 + N2H4 → 4HI + N2 a.How many grams of I2 are needed to react with 36.7 g of N2H4
November 28, 2011 by davian

Chm Help Please!!!
What is the boiling point of a solution of benzene contain 0.2 moles of a non volatile solute in 125 grams of benzene given that pure benzene has a b.p. of 80.1 Celcius and a Kbp of +2.53 C/m. Thanks!
September 9, 2014 by Layla

Chemistry
What is the mass in grams of the following: a) 3.011x10 to the 12th power atoms F b)1.50x10 to the 23 power atoms Mg
October 2, 2007 by Ivanka

Chemistry
How many joules are needed to heat 8.50 grams of ice from -10.0 degrees to 25.0 degrees I came up with 2124 joules
January 17, 2008 by Mike

chemistry
an aspirin tablet contains 5.00X10^2 mg of active ingredient. how many grams of ap of active ingredient does it contain
July 5, 2010 by kelly

Honors Chemistry
Fe2O3 + 2Al --> 2Fe + Al2O3 How many grams of Fe will form when 97.6g Al2O3 form? Please & Thank you
February 23, 2010 by Ana

chemistry
A 2.9-L sample of paint that has a density of 4.65 g/mL is found to contain 26.7 g Pb3N2(s). How many grams of lead were in the paint sample?
September 25, 2010 by caroline

Chemistry
If 18.0g of CO2 is produced in the reaction of C2H2 with O2 to form CO2 and H2O how many grams of H2Oare produced
November 25, 2010 by Mat

chem
what is the molality of a solution of 50.0 grams of propanol in 152 mL water if the density of wate is 1.0 g/mL and the density of the solution is 0.78 g/mL
February 12, 2011 by paula

Chemistry
How many grams of ice are needed to cool 250 ml of water from 75 degrees celcius to 5 degrees celcius?
April 12, 2011 by Thao

Chemistry
What is the mass of carbon dioxide if 100 grams of methane is oxidized to carbon dioxide and water?
April 27, 2011 by joy

Chemistry
What is the mass of carbon dioxide if 100 grams of methane is oxidized to carbon dioxide and water?
April 28, 2011 by joy

chemistry
if 25 moles of sodium phosphate are reacted with potassium hydroxide, how many grams of potassium phosphate will form?
May 6, 2011 by carlene

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