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March 23, 2017

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Number of results: 71,238

Chemistry
If 4.5 moles of elemental carbon react, what volume of carbon dioxide will be produced at STP?
January 8, 2015 by Anon

Chemistry
Calculate the concentrations of Cd+2 , Cd(CN)4^-2 and CN at equilibrium when dissolvs 0.42 moles of Cd(NO3)2 (2.50 mol/L) Kf for Cd(NO3)2 = 7,1x10^16.
May 5, 2016 by David

chemistry
Arrange the following in decreasing order of their massess . a. 2.5 moles of water. b. 3.012×10×24 c. 25 g of water
December 1, 2016 by poornendu

college resume
Is there any way to edit or improve this? Community Service Description Grades(s) Hrs/wk wk/yr BuildOn Raised $2,000 through active fundraising and community service, donated all funds to Malawi, lived with a host 10 56 4 family for a week to fully ascertain their lifestyle, ...
November 5, 2013 by chhristine

English
Choose the contraction in parentheses ( ) that correctly completes the sentence . 1/ She (don't, doesn't) know what to expect in the United States . Answer: doesn't 2/ Fortunatley, her aunt and uncle ( haven't, didn't) forgotten to meet her plane. Answer: didn't 3/ ( Didn't, ...
February 23, 2014 by NAwaf

Precalculus
Find the roots of the following quadratic equations by factoring. y=x^2+9x-36 I got (x+12)(x-3) but on the answer key it says that the answer is this, however it renames the x values with opposite values. For example, the answer on the review for it has my answer, but the ...
September 29, 2014 by Zane

French continued
Could you please check these to thanks! Directions: Complete the names of these dishes you have for lunch using à, au, aux. 1. une soupe ------- oignon. Answer: à l' 2. un sandwich -------- jambon. Answer: au 3. un sandwich ------- fromage. Answer: au 4. une omelette...
March 2, 2009 by French gurl

chem lab (webwork)
Which of the following is NOT true of colligative properties? Colligative properties are... A. dependent on the mass of solute present. B. independent of the chemical identity of the solute. C. responsible for lowering the vapor pressure of a solution versus the vapor pressure...
April 5, 2010 by UCI studebt

chemistry-Dr BOB
Hi Dr. Bob, I first want to tank you for all your help. Secondly, I don't understand why this was marked wrong. When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this ...
October 18, 2015 by patrick

chem
a 22.5g sample of (NH4)2CO3 (ammonium carbonate) contains _____ moles of ammonium ions?
November 1, 2009 by ashlee

chemistry
what mass of NaOH would be dissolved in 1dm3 of water to obtain 0.5 moles of the NaOH solution
November 3, 2009 by osah felix

Chemistry-Equation
How many moles of H3PO4 are produced when 142.0 g P4O10 reacts completely to form H3PO4?
March 5, 2010 by meg

chemistry
how do you find the moles of solute and the molarity if the molar mas is 98.07, mass of solute is 62.0, and the volume of solution is 1.00?
June 13, 2010 by denise

chemistry
Consider a 0.70 M solution of Al(NO3)3 in water. What is the nitrate ion concentration in this solution, in units of moles/L?
September 7, 2010 by Susy

Chemistry
Consider a 0.70 M solution of Al(NO3)3 in water. What is the nitrate ion concentration in this solution, in units of moles/L?
September 8, 2010 by Diana

Chemistry
If 3.2 moles of NaCl are dissolved in enough water to make a 0.98-liter solution, what is the molarity of the solution?
March 21, 2011 by ilyrae

CHEM 112
A buffer solution is 1.40 M in NH3 and 1.00 M in NH4Cl. If 0.100 moles of NaOH are added to 1.00 L of the buffer, what is its pH?
October 6, 2011 by Haley

CHEM 112
A buffer solution is 1.40 M in NH3 and 1.00 M in NH4Cl. If 0.100 moles of NaOH are added to 1.00 L of the buffer, what is its pH?
October 6, 2011 by Haley

Chemistry
What is the volume of 128 g of Oxygen at STP?... here's my work... O=16 128/16= 8 moles 8(22.4) = 179.2 L Where did i go wrong?
January 16, 2012 by Jackie

Chemistry - Mole Ratio
How many moles of oxygen are produced from the decomposition of 3.4g of hydrogen peroxide? How many molecules of O2 are produced?
February 15, 2012 by Dani

chemistry
How many moles of sodium hydroxide are produced when 0.155 mole of sodium reacts with excess water?
February 24, 2012 by Cris

Chemistry 101
75.0 G tartaric acid in 1 liter is what Molarity (moles/liter)? mw=150.087 g/mol
October 15, 2012 by Renee

chem 101
75.0 G tartaric acid in 1 liter is what molarity (moles/liter) mw= 150.087g/mol
March 14, 2013 by alain

chemistry
if a total of 18.6 mol of NaHCO3, and 6.2 mol of C6H8O7 react, how many moles of CO2 and Na3C6H5O7 will be produced?
March 20, 2013 by morgan

Chemistry
Calculate the pressure of 0.800 moles of helium gas, when the gas is in a balloon with a volume of 2.30 L at a temperature of 32°C.
March 24, 2013 by Debbie

chemistry
a gas occupies 37.6 L at 2.00 atm pressure and 27C degrees. how many moles of gas are present in this sample
May 8, 2013 by barbra

Chemistry
Convert 6.42x10^23 atoms a pure substance to moles of that substance. That is all it says. Please help. Thank you.
September 12, 2013 by Miley

CHEMISTRY
Calculate the maximum work done when two moles of N2 expands isothermally from 10 litres to 20 litres at 25o C
June 21, 2014 by TARUN

chemistry
A chemist used 500g of glucose(c6H12o6)in a preparation of a drug in the laboratory how many moles was used?
February 2, 2015 by Anonymous

chemistry
You have 14.0mL of a 0.12M NaOH solution. How many moles of HCl will it take to neutralize this solution?
March 1, 2015 by Savannah

CHEMISTRY
HOW MANY MOLES OF SILVER IODIDE COULD BE PRODUCED IF THIS REACTION WAS STARTED WITH 4.3 MOL IODINE AND AN EXCESS OF SILVER?
March 4, 2015 by Shannon

CHEMISTRY
HOW MANY MOLES OF SILVER IODIDE COULD BE PRODUCED IF THIS REACTION WAS STARTED WITH 4.3 MOL IODINE AND AN EXCESS OF SILVER?
March 5, 2015 by Shannon

Chemistry
How many moles of NH3 must be added to 1.00 L of solution to dissolve 0.979 g of CuCO3? For CuCO3, Ksp = 2.3 × 10-10.
March 10, 2015 by Jane

chem
An experimental chamber has a volume of 60 L. How many moles of oxygen gas will be required to fill the chamber at STP?
March 11, 2015 by iNeedHelp

chemisty
In aqueous reactions, if the amounts of reactants (and products) that are used are not given in moles, they are usually given in?
April 13, 2016 by Sammy

physics
2H2(g)+O2(g)-2H2O(g) Calculate the initial number of moles of oxygen gas and hydrogen gas
August 3, 2016 by Tumi Mokoena

Chemistry
If a 30.pL tank of laughing gas contains 2.74 moles of N2O at 25 degrees C, what is the pressure (atm) in the tank?
December 5, 2016 by Dana

science
How many moles of carbon monoxide are needed to react completely with 108 kg of Fe2O3. Fe2O3(s)+CO(g)→Fe(s)+CO2(g)
March 8, 2017 by Janessa

algebra 1
select an appropriate unit from the choices below and connect the rate to that unit. answer a - ft /s answer b - mph answer c - mm/s answer d - km/s question : A car traveling at 36 ft/s
October 15, 2015 by kamryn

math
I have solved the following questions, let me know if they are correct, thanks. 1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify a. y= 3x^4 - 4e^x + 8 answer: 4(3x^3 - e^x) b. y= (3 + 4e^x)^5 answer: 20e^x (3+ 4ex)^4 c. y= (e^...
March 24, 2012 by help

Chemistry
How many moles of bromine atoms are in 8.0x10^20 bromine molecules?
September 11, 2009 by Anonymous

chemistry
if you have 720 g of the compound CaBr2 how many moles of it do you have
May 23, 2010 by laquan

Chemistry
How many moles of ammonium ions are in 0.807 g of ammonium carbonate?
June 1, 2010 by Anita

chemistry
How many moles of KCL are contained in 114 mL of a 1.85 M KCL solution?
October 13, 2010 by Stacy

10th grade
how many moles of anhydrous MgSO4 are in 2.04grams of MgSO4
November 4, 2010 by dasha

Chemistry
How many moles of HCl are present in a 50mL 3M solution of HCl?
January 12, 2011 by Jess

Chemistry
How many moles of HCl are present in a 50mL 3M solution of HCl?
January 12, 2011 by Jess

chemistry
A 27-gram sample of water, H2O, is how many moles of water?
March 7, 2011 by Amy

Chemstry
How many moles of NaCL are contained in .2570 L of a 37.5 mM Solution of NaCl?
May 1, 2011 by Jann

chem
How many moles of glucose (C6H12O6) are in 1.6 liters of a 0.75 M C6H12O6 solution?
January 17, 2012 by bryan

chemistry
If you have 4.90 moles of Ba, how many liters of N2 would you have at STP?
March 17, 2012 by Tom

science
How many moles of oxygen in a litre of air which has 21% oxygen by volume?
May 11, 2012 by Kanika

chemistry
How many moles of ammonium ions are in 5.393 g of ammonium carbonate?
May 15, 2012 by haley

Chemistry
How many moles of MgCl2 are present in 5 liters of a 0.12 M MgCl2 solution?
May 31, 2012 by Anonymous

chemistry
How many moles of aluminum do 5.9×1024 aluminum atoms represent?
September 22, 2012 by alex

Chemistry
How many moles of CaCl2 are in 32cm cube of 0.2M solution of CaCl2?
October 4, 2012 by desperate

Chemistry
How many moles of NaOH are in 125mL of a 4.00M solution of NaOH?
November 3, 2012 by Anonymous

Chemistry
If 32.6 g of aluminum is produced, how many moles of aluminum nitrate is reacted?
November 13, 2012 by Kim

College Chemistry
How many moles of aluminum do 2.66×10^24 aluminum atoms constitute?
January 28, 2013 by Kaycie

physics
suppose that there are 1.9*10^25 stars in the universe. how many moles of stars would this be?
April 22, 2013 by john

chem
If 41.5 moles of an ideal gas is at 4.71 atm at 49.90 °C, what is the volume of the gas?
December 1, 2013 by dinah

chemistry
0.50 mol of Fe react with 0.60 mol of O2, how many moles of Fe2O3 will form?
April 2, 2014 by matt

Chemistry
Moles of Copper in the original .825g of Copper Oxide
October 8, 2014 by Amanda

chemistry
You need 2.5 moles of aluminum for an experiment. How many atoms of aluminum is this?
October 24, 2014 by Anonymous

chemistry
what volume of 0.5 BaCl2 is needed to have 0.1 moles of BaCl2?
November 25, 2014 by Amy

chemistry-URGENT
how many moles of atoms are contained in 7.654 x 10^32 atoms of Ga ? Thank you!
December 2, 2014 by Ellie

env.sc.
How many No.of ions of cadmium present in 3n moles of cadmium nitrate
March 13, 2015 by upasana singh

chemistry
how many moles of K2SO4 are present in 111.5 mL of 0.516 M K2SO4?
April 22, 2015 by Chem3A

Chemistry (atoms)
How many atoms of oxygen, O, are in 0.0595 moles of water?
October 23, 2016 by Ray

Chemistry
How many hydrogen atoms are present in 6.49 moles of hydrogen molecules
February 26, 2017 by Quaniece

world geography
1. When Australia became the federated Commonwealth of Australia in 1901, Sydney and Melbourne competed to be the capital city. A compromise was reached and _______ became the federal capital in 1928. A. Canberra B. Brisbane C. Adelaide D. Sydney 2. According to the World ...
June 22, 2013 by SUB-SAHARAN AFRICA, AUSTRALIA,OCEANIA, AND ANTARTI

science
Hi I have 2 questions I hope someone can help me :) 1)A pocket of gas is discovered in a deep drilling operation. The gas has a temperature of 480c and is at a pressure of 12.8 atm. What volume of gas is required to provide 18.0 L of gas at the surface where the conditions are...
March 25, 2007 by lindsay

math-check
I have solved the following questions, let me know if they are correct, thanks. 1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify a. y= 3x^4 - 4e^x + 8 answer: 4(3x^3 - e^x) b. y= (3 + 4e^x)^5 answer: 20e^x (3+ 4ex)^4 c. y= (e^...
March 24, 2012 by help

chemistry
The question: Formic acid when warmed with sulfuric acid, decomposes to water and carbon monoxide. HCHO2(l)-->H2O(l)+CO(g) If 3.85L of carbon monoxide was collected over water at 25C and 589mmHg, how many grams of formic acid were consumed? (This problem requires that you ...
June 17, 2009 by Gweedo

math
Solve each equation. What am I doing wrong because the answer is suppose to be 11/2 and I don't get the answer. Here's what I'm doing... Problem: 2x+1/4-3x-4/5=1/2 I get: 10x+5-12x-16=10 Which gives me -2x=21 My answer is -21/2 the correct answer is suppose to be 11/2
September 2, 2010 by Ronnie

calculus-answer check
1. Determine the slope of the tangent to the graph of y=4/x at (1,4) my answer is -4 2.What is the slope of the line perpendicular to y=(x-2)/(x+2) at (2,0) my answer is -4 3. For which value of x is the derivative of f(x)=(x-1)^10(x+2)^5 equal to 0? my answer is 1
May 9, 2014 by Kim

Chemistry
Free-energy change, ΔG∘, is related to cell potential, E∘, by the equation ΔG∘=−nFE∘ where n is the number of moles of electrons transferred and F=96,500C/(mol e−) is the Faraday constant. When E∘ is measured in volts, Δ...
May 18, 2014 by Tim

chemistry
You react chemical A with chemical B to make one product. It takes 100 grams of chemical A to react completely with 20 grams of chemical B. What is true about the chemical properties of the product? a. the properties are more like those of chemical A b. the properties are more...
February 13, 2012 by student

Chemistry
Titration was used to determine the molarity of acetic acid in vinegar. A primary standard solution of KHP was used to standardize the NaOH. 1. When performing this experiment, impure KHP was used to standardize the NaOH solution. If the impurity is neither acidic or basic, ...
March 28, 2014 by Sandy

Chemistry
Express each quantity as a mass in grams. a) 3.70mol of H2O b) 8.43 x 10^23 molecules of PbO2
October 20, 2007 by Marty

chemistry
Using calories, how much heat will 32 grams of water absorb when it is heated from 25 C to 80 C?
February 5, 2008 by chelsea

Chem Also Urgent!
How do I determine the number of grams for the following substance: 2.40 mol O2?
February 26, 2008 by Lisa

Chemistry
4 NH3 + 5 O2 --> 4 NO + 6 H2O. How many grams of O2 are required to product 90 g of NO? Please assist in solving.
July 24, 2008 by Amber

basic chem lab question
what is the mass of a typical 50 ml glass beaker in grams
September 21, 2008 by al

chemistry/math
If aluminum has a density of 2.78 g/ml, how much space would 32 grams occupy?
September 29, 2008 by Michelle

Chemistry
How many grams of phosphorus react with 31.3 L of O2 at STP to form tetraphosphorus decaoxide? P4(s) + 5 O2(g) -> P4O10(s)
October 13, 2008 by Niki

Chemistry
Calculate the heat released when 25.0 grams of water freezes at 0 degrees celsius.
December 28, 2008 by Completely Lost

chem
find the density of a cube if it has a mass of 2 grams and has a length of i centimeter on each edge/
January 9, 2009 by tonya

chemistry
how many grams of solid NaOH are required to prepare 200.0 mL of a .050 M solution?
September 1, 2009 by mariah

chemist ry
if 500 g of KCLO3 decomposes and produces 303 g of KCL, how many grams of O2 are produced?
November 7, 2009 by barbie

science
For the reaction 2Na(s) + Cl(g) ¨2NaCl(s), how many grams of NaCl could be produced from 103.0 g of Na and 13.0 L of Cl (at STP)?
November 13, 2009 by Ethan

chemistry
how many grams of ethylene would have to be burned to produce 450 kJ of heat?
November 15, 2009 by mandee

chemistry
For the reaction 2Na(s) + Cl(g) ¨2NaCl(s), how many grams of NaCl could be produced from 103.0 g of Na and 13.0 L of Cl (at STP)?
December 1, 2009 by cr

Chemistry
Estimate the solubility of lead (ll) chloride in grams per liter. ksp= 1.7 x 10^-5
December 10, 2009 by Donna

Chemistry
what is the density of an unknown substance whose mass is 4.5 grams and volume is 5 mil?
January 8, 2010 by Gary

science
N2 + 3H2 --> 2NH3 how many grams of ammonia are made if you have 15.00 g of both N2 and H2 present?
January 10, 2010 by Laur

Chemistry
Approximately how many grams of NaNo3 will dissolve in 100g of water at 20 degrees Celsius?
January 28, 2010 by Lily

chemistry
What will be the mass in grams of hydrogen atoms (only) that will be present in 22.2 g of compound A (XH3)?
February 1, 2010 by richard

chemistry
How many grams of water should be added to 25.0 g of NaCl to produce a 0.450 m solution?
February 10, 2010 by CC

Organic chemistry
How many grams of water would it take to quench 1 g of phenylmagnesium bromide?
February 12, 2010 by Chem

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