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March 26, 2017

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Number of results: 8,372

chemistry
The mass ratio of Kr to F in a particular compound is 2.206:1. How many grams of fluorine are present if the compound contains 713.3 grams of Kr?
October 1, 2010 by Elizabeth

Chemistry
how many grams of potassium bromide could be recovered by evaporating 650 grams of 15 perentKBr solution to dryness...... 650 * (.15) = 97.5 is this correct
October 25, 2010 by Pierre

Chemistry
if 30.0 grams of molten iron (III) oxide reacts with 275 grams of aluminum, what is the mass of the iron produced.
December 5, 2010 by Kalen

chemistry
What is the percent by mass concentration of KCl in a solution prepared by adding 80 grams KCl to 200 grams of water?
October 11, 2011 by Cristina

chemistry
If one atomic mass unit is equal to 1.6606 x 10-24 g, what is the mass in grams of 83549 atoms of Cu? (find in grams)
September 15, 2012 by No one of importance

Stoichiometry
How many grams of oxygen are required to completely burn 85.6 grams of methane (CH4)? CH4 + O2 → H2O + CO2
November 14, 2012 by Mike

Chemistry
Upon heating 134 g MgSO4 · 7 H2O: (a) how many grams of water can be obtained? (b) how many grams of anhydrous compound can be obtained?
May 26, 2015 by Mark

Statistics
The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...
March 15, 2013 by Emily

Math
If a camera and a lock weigh 330 grams together. Also the same camera and a crown together weighs 670 grams. Also the weight of a crown and a lock is 470 grams. What is the weight of each individual object?
May 15, 2016 by Matt

Chemistry
Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are convert to 50 grams of ice at 125 C please help
October 27, 2008 by Joshua

chemistry
What is the theoretical yield in grams of the precipitate starting with 1.250 moles of iron ions (charge is +3) and 60.00 grams of hydroxide ions?
November 7, 2008 by matt

chemistry- stoichiometry problems
C2H4+3 O2->2 co2+2 H2O If you start wit 45 grams of C2H4 how many grams of carbon dioxide will be produced?
April 22, 2009 by anon

Chemistry
a)How many grams of NH3 can be produced from 2.84mol of N2. b)How many grams of H2 are needed to produce 14.86g of NH3? balanced equation: 3H2+N2->2HN3
September 21, 2010 by Amy

chemistry honors
how many grams of a stock solution that is 85% H2SO4 by mass would be needed to make 150 grams of a 45.0 percent solution?
September 30, 2010 by jimmy

chemistry 2
What is the molality of a solution that has 80 grams of Benzoic Acid dissolved in 400 mL of ethanol. The density of ethanol is .789 grams/moles
November 11, 2010 by MICHELLE

chemistry
how many grams of lithium sulfate will be formed when 25 grams of sulfuric acid react with an excess of lithium hydroxide in the following reaction
March 13, 2011 by mary

Chemistry
How many grams of potassium chlorate, KClO3(s) must decompose to produce potassium chloride, KCl(s), and 1.45 grams of oxygen gas?
March 20, 2011 by franci

Chemistry
A student reacts 20.0 grams of sodium hydroxide with hydrochloric acid and obtains 25.0 grams of sodium chloride. What is the percent yield?
April 3, 2011 by Lisa

math
1 ounce= 30 grams about how much does a box of 1,000 paper clips weigh if the empty box weighs 15 grams
May 10, 2012 by Celest

chemistry
The reaction of 9.3 grams of fluorine with excess chlorine produced 4.1 grams of ClF3. What percent yield of ClF3 was obtained?
August 30, 2012 by Nick

chemistry
Suppose 87.9 grams of FeCl3 reacts with excess aluminum metal to produce 22.3 grams of Fe. What would be the % yield? FeCl3 + Al --> AlCl3 + Fe
March 26, 2013 by Amy

ap
The reaction of 5.3 grams of fluorine with excess chlorine produced 4.6 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %
August 30, 2013 by Gabriella

chemistry
One teaspoon of instant coffee ( 3 grams ) is dissolved in 250 grams of water. What percent of the resulting solution is coffee ?
November 20, 2014 by Anonymous

chemistry
how many grams of HNO3 can be produced if 225 grams of NO2 is mixed with 55.2 g of H2O? 3NO2 + H2O=2HNO3 + NO
January 24, 2010 by jenny

Chemistry
how many grams of potassium bromide could be recovered by evaporating 650 grams of 15 perentKBr solution to dryness...... 650 * (.15) = 97.5
October 25, 2010 by Pierre

Science
Determine the number of grams of KNO3 which will dissolve in 100 grams of H20 at 100 degrees celscius?
February 9, 2011 by Jessica

chemistry
finding the largest mass of Aluminum chloride that can be formed when reacting with 31 grams of aluminum with 36 grams of chlorine
February 15, 2011 by Anonymous

geometry
The density of a block of wood is 0.78 grams per cubic centimeters. What is the volume of the block if its mass is 28.8 grams?
February 18, 2011 by mariah

chemistry
The solubility of KI is 50 g in 100 g of H2O at 20 ?C. If 110 grams of KI are added to 200 grams of H2O, what would happen?
June 20, 2011 by Glo

chemistry
if 30 grams of sodium (Na reacts completey with 28 grams of water, what is the mass of Sodium hydroxide (NaOH)formed?
October 12, 2011 by Anonymous

chemistry
if 30 grams of sodium (Na reacts completey with 28 grams of water, what is the mass of Sodium hydroxide (NaOH)formed?
October 12, 2011 by Anonymous

Chem
calculate the mass in grams of carbon needed to produce 160 grams of CO2 burning. C + O2 -> CO2
December 15, 2011 by Amber

chemistry
For the balanced equation shown below, how many grams of H2SO4 reacted, if 50.9 grams of H2 are produced? Mg+H2SO4=>MgSO4+H2
December 18, 2011 by alesa

Math
Stephanie got a travel pack of 4 aspirin, each 500 milligrams. How many total grams are in the pack 2 grams?
November 6, 2012 by Jerald

CHEMISTRY HWK MAKES NO SENSE
How many grams of C are required to make 464.99 grams of this compound? compound= C3H8
November 29, 2012 by HELP

Chemistry
How many grams of zinc must react to give 13.0 grams of ZnO according to the balanced equation. 2 Zn(s) + O2(aq) --> 2 ZnO(s)
March 18, 2013 by Lindt

Science
43Lb has a half life of 42 minutes. If you start with 100 grams, how many grams will you have after 84 minutes?
January 28, 2014 by Sabrina

chemistry
How many grams of calcium carbonate are required to prepare 50.0 grams of calcium oxide? CaCO3-> CaO + CO2
March 11, 2014 by Kendra

chemistry
How many grams of copper atoms are needed to supply the same number of atoms as does 235 grams of iron?
September 22, 2014 by Anonymous

Chem
If 2.00 grams of potassium are allowed to react with 2.00 grams of bromine by the following equation, which reactant is the limiting reactant?
October 8, 2014 by Baiey

Chem 130
How many grams of Aluminum oxide will be produced when 2.44 grams of Aluminum burns in air (i.e. react with Oxygen)?
October 29, 2014 by michelle

Chemistry
CaCO3 ----------> CaO + CO2 When 45 grams of calcium carbonate decomposes, how many grams of calcium oxide are produced?
April 16, 2015 by Andrea

Math
Ralph has a bag of 28 marbles. Each marble weighs 3.099 grams. About how many grams does the bag weigh?
May 27, 2015 by Vernon

Science
Acetylene gas combust.how many grams of carbon dioxide and grams of water are produced when 52.0 g of acetylene burns ?
April 11, 2016 by Tan

Chemistry
The solubility of KI in ethyl alcohol is 2.00 grams of KI in 100.0 grams of this alcohol. From this information, calculate the molarity of this solution.
October 26, 2016 by Anonymous

Chemistry
Consider the reaction: Fe2O3+2Al=Al2O3 How many grams of Al are necessary to make 100.2 grams of Al2O3?
December 5, 2016 by Ilazaya

science
How many grams of sodium hydroxide is required to neutralize 73 grams of hydrochloric acid and to from sodium chloride and water
December 10, 2016 by bala

chemistry
An alka-seltzer tablet weighing 3 grams is added to a flask of water (weighing 250 grams).At the end of the experiment, the flask weighs a total of 249.6 grams.Explain why this experiment does not seem to follow the Law of Conservation of Mass and how the experiment could be ...
September 24, 2014 by anonymous

chemistry
Show the calculation of (1) the expected grams of urea (CH4N2O) formed in the reaction of 6.5 grams of lead cyanate (Pb(CNO)2) with excess ammonium hydroxide and then show the calculation of (2) the % yield if the actual yield of urea is 1.89 grams. Reaction is shown below: Pb...
March 12, 2015 by emily

physics
A piece of copper of mass 40 grams at 20 degrees Celsius is placed in a copper calorimeter of mass 60 grams containing 50 grams of water at 10 degrees Celsius .ignoring heat losses,what will be the final steady temperature after stirring?(specific heat capacity of copper and ...
May 29, 2016 by samuel

chemistry
what is the maximum number of grams of PH3 that can be formed when 6.2grams of phosphorus reacts with 4.0 grams of hydrogen to form PH3? P4+6H2--> 4PH3
June 9, 2008 by afdsfd

chemistry
If you start with ten grams of lithium hydroxide, how many grams of lithium bromide will be produced? Round to the nearest tenth. Don't forget the units.
June 1, 2010 by trcey

12th grade
If you start with 20 grams of hydrochloric acid, how many grams of sulfuric acid will be produced? Round to the nearest tenth. Don't forget the units.
July 15, 2010 by Paris

College Chemistry
If 10.6 mol of carbon monoxide is produced how many grams of carbon were used? How do you convert moles to grams? And what are the steps please for the answer.
October 21, 2010 by Helen

Chemistry
What is the concentration, in w/w%, of a solution prepared from 50.0 grams NaCl and 150.0 grams of water? I think it would be 25.0%, but I'm struggling with these new concentration calculations.
November 29, 2010 by Ann

Chemistry
If you start with ten grams of lithium hydroxide, how many grams of lithium bromide will be produced? Round to the nearest tenth. Don't forget the units.
January 9, 2011 by Katie

chem
Two hundred grams of a substance requires 0.52 kJ of heat to raise its temperature from 25°C to 45°C. q = mCT. Mass (m) is in grams. Temperature is in degrees Celsius.
May 17, 2011 by Pat

ap chemistry
The reaction of 9.5 grams of fluorine with excess chlorine produced 5.9 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %
September 11, 2012 by cheri

chemistry
how much energy is released when 496 grams of ethylene (46.0 grams/moles) vapor condenses? the heat of vaporization of ethylene is 38.6 kj/mol.
November 2, 2012 by Anonymous

Chemistry
How many grams of chlorine are required to react completely with 5.00 grams of sodium to produce sodium chloride ? 2na + cl2 → 2nacl
March 29, 2013 by mispa

chemistry
A student stated that the solubility of KCL, at 20 degrees Celsius was 36 grams of KCL per 100 grams of solution. What is wrong with this statement?
March 8, 2014 by Anonymous

chemistry
A student stated that the solubility of KCl at 20 degrees Celsius was 36 grams of KCl per 100 grams of solution. What is wrong with this statement?
March 8, 2014 by Anonymous

AP Chemistry
The reaction of 5.1 grams of fluorine with excess chlorine produced 4.5 grams of ClF3. What percent yield of ClF3 was obtained? Answer in unites of %
December 2, 2015 by Zach

AP Chemistry
The reaction of 5.7 grams of fluorine with excess chlorine produced 7.6 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %.
September 7, 2016 by Rachel

math
Carbon-14 has a half-life of 5730 years. How long will it take 17 grams of carbon-14 to be reduced to 10 grams? Round to the nearest integer.
November 9, 2016 by mer

Chemistry
The balanced equation for the synthesis of water is: 2H2 + O2 > 2H2O If I have 5.5 grams of water, at least how many grams of Oxygen gas was needed?
January 21, 2017 by Erin

physics
a 400 kg crate is to be lifted a height of 20 m in 30 s. Compute the work done and the power consumed in lifting the crate
January 24, 2012 by joan

Math
The diameter of a circular pizza is 24 in. How much pizza is eaten (in square inches) if half of it is consumed?
March 3, 2014 by Chloe

Chemistry
If a solid state lithium battery produced 5.00 mA in 8.25 h, then the mass, in milligrams, of lithium consumed would be?
July 11, 2016 by Luke

Physics
400 grams of a metal at 300 C is added to 100 grams of of water at 20 C. Assuming all the heat lost by the metal is gained by the water and that the final temperature or water and metal is 95 C, calculate the specific heat of the metal. Using grams and degrees C, the specific ...
October 20, 2015 by Sammie

CHEMISTRY
IN THE REACTION P4 +5 O2= 2P 2 O5. HOW MANY MOLES OF O2 ARE CONSUMED EACH TIME 0.5 MOLES OF P2 O5 ARE FORMED?
July 24, 2008 by Persia

chemistry
How many grams of HCOOH are needed to make 3.7 liters of aqueous solution of pH=3.5? I have followed the steps for a similar problem posted;I found x to 3.16e-4 mol/L but I'm having trouble converting it to grams.
October 6, 2010 by nick

Chemistry
1. Tin and oxygen gas are reacted together to form Tin (IV) oxide, a solid. If a piece of tin foil, 8.25cm x 21.5cm x 0.60mm (density = 7.28g/cm3) is exposed to oxygen and all the tin reacts, what is the mass of the oxidized tin foil? (98.4g) 2. From the information in problem...
May 29, 2009 by Gweedo8

CHEMISRTY
HOW MANY GRAMS OF MAGNESIUM ARE REQUIRED TO PRODUCE 2.154 GRAMS OF PRODUCT? STEP BY STEP EXPLAINATION
February 28, 2010 by Donna

Chemistry
What mass (in grams)of mercury will fit into a 2 L bottle? M= DV V= 2L= 2,00o mL D= 13.6 g/ mL Mass= 27, 200 grams??
April 7, 2010 by Amy

chemisrty
If 55.0 grams of KCIO3 is decomposed by the following equation, how many grams of oxygen can be produced? 2 KCIO3 > 2 KCL + 3 O2
June 29, 2010 by gary

chemistry
What is the total sample size (in grams)for a sample of ethanol (CH3CH2OH) which contains 3.39 grams of oxygen?
September 22, 2010 by Grace

science
You need 5.00 grams of AgNO3. You have a 1.25 molar solution. What volume of that solution contains 5.00 grams?
November 11, 2010 by MICHELLE

CHEM
HOW MANY GRAMS OF SALT ARE REQUIRED TO PREPARE 300 G OF 15% SALT SOLUTION? HOW MANY GRAMS OF WATER ARE NEEDED?
December 4, 2010 by Anonymous

Chemistry
How many grams of Ammonia, NH3 can be made from 250. grams of N2(g) ? ( first Balance the equation) N2 (g) + H2 (g) > NH3 (g)
March 10, 2011 by Dupree

chemistry
If there are 2.0 grams in 1 meter of copper wire, how many centimeters would be needed to provide .28 grams of copper?
September 2, 2011 by Julie

chem1151
If 2.68 grams of Copper was recovered and you started with 8.94 grams of Copper(II)chloride,then what is the percent yield of the reaction?
March 8, 2012 by linda

chemistry
If 75.0 grams of water is decomposed into hydrogen and oxygen, how many grams of oxygen should be formed?
March 12, 2012 by Anonymous

chemistry
If 75.0 grams of water is decomposed into hydrogen and oxygen, how many grams of hydrogen should be formed?
March 12, 2012 by stoi.

Chemistry
2 SO2 (g)+O2 (g)→2 SO3­↑ How many grams of SO3(g) are formed if 8.45 grams of oxygen are used?
February 18, 2013 by Joe

chemistry
Calculate the mass of co2 produced when 2ch3oh mixed with o2. Given that 2ch3oh is 4o grams and o2 is 46 grams.
April 9, 2013 by Ruusa

chemistry
Calculate the mass of co2 produced when 2ch3oh mixed with o2. Given that 2ch3oh is 4o grams and o2 is 46 grams.
April 9, 2013 by Ruusa

chemistry
If 4.02 grams of a hydrate of magnesium sulfate loses 2.06 grams of water when heated, what is the formula for the hydrate
October 20, 2013 by Anonymous

chemistry
How you solve P4(s)+5O2(g)------>P4O10(g) .if 2.50 grams of phosphorus is ignited in a flask how many grams of P4O10 are formed ?
April 1, 2014 by Anonymous

Chemistry
If you have 324 grams KBr and want to produce a 1.48 M solution in water how many grams of water are needed?
April 6, 2015 by Angela

science
Julie mixes 40g (grams) of unknown X with 20g of unknown Y, how many grams of products will be produced and why?
October 26, 2015 by chanille

chemistry
if copper (II) sulfate pentahydrate is known to be 36% of water how many grams of water will be lost when heating a 5.75 grams sample?
September 27, 2016 by velia

chemistry...
equation 2CoI3 + 3 K2S= Co2S3 + 6KI 2 moles of Cobalt (III) iodide + 3 moles of Potassium sulfide = cobalt (III) sulfide + 6moles of Potassium Iodide assuming all that can react will react, how many grams of cobalt (iii) sulfide will form when 1318.89 grams of cobalt (III) ...
October 10, 2010 by pete

Chemistry...verification
2 equation 2CoI3 + 3 K2S= Co2S3 + 6KI 2 moles of Cobalt (III) iodide + 3 moles of Potassium sulfide = cobalt (III) sulfide + 6moles of Potassium Iodide assuming all that can react will react, how many grams of cobalt (iii) sulfide will form when 1318.89 grams of cobalt (III) ...
October 10, 2010 by pete

physics
Two metal disks are taped to a meterstick. The mass of the meterstick is 460 grams. Disk 1 has a mass of 300 grams and is located at the 28 cm mark. Disk 2 has a mass of 500 grams and is located at the 64 cm mark. At what posi- tion along the meterstick should you place a ...
November 6, 2008 by Sandhya

statistics
The data below represents the amount of grams of carbohydrates in a sample serving of breakfast cereal. 10 18 24 30 19 22 24 20 18 25 20 22 19 The variance for this data would be __________ grams.
February 9, 2010 by iyra

Chemistry
A single mole of AgNo3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNo3 would need to be dissolved in 5oomL?
November 2, 2010 by Jazz

Chemistry
how do I write out this problem? How many grams of lithium metal would be produced if 0.500 grams of magnesium was added to a solution of lithium chloride
November 30, 2010 by Tosha

chemistry
a mixture of 1.00 grams hydrogen gas and 1.00 grams helium is placed in a 1.00 L container at 27 degrees cesius. Calculate the partial pressure and total pressure
February 1, 2011 by Anonymous

chemistry
In the following reaction, how many grams of chlorine can be produced if 120 grams of titanium chloride (TiCl4) reacts with oxygen: TiCl4(g) + O2(g) TiO2(s) + Cl2(g)
February 18, 2012 by salem girl

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