03/05/19

Chemistry problem 3

At what temperature will 541 grams of water boil if 18.2 grams of glycerin (Molar mass= 92g/mol) are dissolved in it?
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03/05/19

0.10 mole of solid calcium hydroxide is added to 1.00 liter of a 0.50 M solution of hydrochloric acid. After the reaction is complete, the hydrogen ion concentration of the solution will be:
A) 0.40 MB) 0.10 MC) 0.20 MD) 0.050 ME) 0.30 MPlease explain and show work! I've been stuck on this problem for ages
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03/04/19

Electron & molecular geometries

Electron geometry of PH3?Molecular geometry of PH3?
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03/04/19

An atom of strontium -90 contains

(A) 38 electrons, 38 protons, 52 neutrons (B) 38 electrons, 38 protons, 90 neutrons (C) 52 electrons, 52 protons, 38 neutrons (D) 52 electrons, 38 protons, 38 neutrons
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03/04/19

How many atoms are in 0.0556 moles of Al?

Please I need an explanation on how to solve this problem. Thanks
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03/04/19

CHEM Calculating the number of moles
A flexible container at an initial volume of 5.12 L contains 7.51 mol of gas. More gas is then added to the container until it reaches a final volume of 17.9 L. Assuming the pressure and... more
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03/04/19

Chemistry Help!
Calculate the Ph of a solution made by 100 ml of .10 HCL and 100.0 ml of .050 M Nh4Cl
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03/04/19

Chemistry Help!
What is the ph of a solution containing .10 M Na2C2O4 (sodium oxalate) ?
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03/04/19

what volume of hydrogen will be produced at STP by the reaction of 67.3 g of tin with excess water according to the following reaction
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03/04/19

sample of 98% acid has a density 1.9 gcm3 .amt of pure acid presnt in 2l of acid is
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03/04/19

help with analyzing redox reaction
Bi(OH)3 + 3Si+ 6OH-4Bi + 3SiO32-+ 9H2O name the element oxidized?name of the element reduced?formula of the oxidizing and reducing agent?
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03/04/19

Neutralize an acid

46.3 mL of a 0.0999 M solution of this diprotic acid, HOOC(CH2)2COOH, is titrated to the equivalence point with 0.15 M KOH. Write the balanced equation and determine the volume of the base needed... more
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03/03/19

How many liters of oxygen are needed to react with 6.78 liters of ammonia? (Assume the reaction happens at STP).
Write the answer in sig figure
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03/03/19

821 ML OF N2 GAS WAS COLLECTED OVER LIQUID WATER AT 300K AND 1 ATM IF VAPOUR PRESSURE IS 30 TORR THEN NO OF MOLES OF N2 GAS IN MOIST GAS MIXTURE
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03/03/19

Benzene is one of the compounds used as octane enhancers in unleaded gasoline.

Benzene is one of the compounds used as octane enhancers in unleaded gasoline. It is manufactured by the catalytic conversion of acetylene to benzene: . Which value of Kc would make this reaction... more
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03/03/19

Calculate the volume of solute needed to make 750.0mL of 3.7% (w/v) sodium lactate solution?
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03/03/19

What mass of H2(g) is produced?
An excess of aluminum foil is allowed to react with 225 mL of an aqueous solution of HCl (d=1.088 g/mL) that contains 18.0 % HCl by mass. What mass of H2(g) is produced?
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03/03/19

oxidation or reduction?? either??
For the following balanced chemical equation:     2 Mg (s)   +  O2 (g)   →  2 MgO (s)   3.6 moles of Mg are put into a reaction container with 1.4 moles of O2 gas. The reaction is run until all of... more
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03/03/19

concentration & moles
a) What is the concentration of the new, 100.0 mL solution prepared by diluting 15.0 mL of 0.016 M CuCl2?b) How many moles of Cl1- are there in 10.0 mL of 0.028 M CuCl2 ? 
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03/02/19

The osmotic pressure of human blood is 7.6 atm at 37°C.
The osmotic pressure of human blood is 7.6 atm at 37°C. What mass (in g) of sucrose, (C12H22O11, 342.3 g/mol), is required to make 1.00 L of aqueous solution if the solution must have the same... more
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03/01/19

what is the boiling point of a solution of nacl in water if the solution freezes at −0.93 °c
what is the boiling point of a solution of nacl in water if the solution freezes at −0.93 °c
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03/01/19

Aluminum Chloride produced
Using the following balanced reaction: 6 HCl + 2 Al → 2 AlCl3 + 3 H2What mass of aluminum chloride is produced if 5.0 g H2 also formed?
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03/01/19

A doctor orders 5 mg of compazine, which is used to treat nausea, vertigo, and migraine headaches. If the stock solution is 2.0 % (m/v), how many milliliters are administered to the patient?
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02/28/19

Calculating Moles of Base

For some reason I am really struggling with a titration lab to figure out the moles of base in             a) 675 mg CaCO3            b) 135 mg Mg(OH)2This is the actual amount of pertinent... more
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02/28/19

What mass of H3PO4 is needed to produce 4.1 moles of H2
What mass of H3PO4 is needed to produce 4.1 moles of H2
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