12/05/20

How many grams of sodium sulfate, g Na2SO4, must be provided to prepare a 2.45% (m/m) sodium sulfate solution using 115 grams of water?
Enter your answer with the proper number of significant figures.
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12/05/20

A student wishes to prepare a 5.6% (m/m) iron (III) chloride solution with 0.36 grams of FeCl3. How many grams of water must the student add to the solute?
Enter your answer with the proper number of significant figures.
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12/05/20

Chemistry question( finding the mass of ethanol in my problem)
Find the mass of ethanol that requires 67000J of heat to melt solid ethanol (Hf=109 J/g) to liquid at 159K.This question is really confusing for me and I want to understand how to do it. If someone... more
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12/05/20

The temperature of a 5.0 g sample of Aluminum increases from 25°C to 30°C. How many joules of heat energy were added? (Specific heat of Al = 0.90 J/gK)
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12/04/20

H3PO4 (aq) + H2O (l) ⇔ H2PO4- (aq) + H3O+ (aq) Ka = 7.1 x 10-3 A buffer was prepared using 0.00650 M H3PO4 and 0.0125 M NaH2PO4. Calculate the pH of the buffer solution
H3PO4 (aq) + H2O (l) ⇔ H2PO4- (aq) + H3O+ (aq)      Ka = 7.1 x 10-3A buffer was prepared using 0.00650 M H3PO4 and 0.0125 M NaH2PO4. Calculate the pH of the buffer solution
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12/04/20

Which of the following shows a correct acid/conjugate base pair?
 A. H3PO4/H2PO4- B. NO3-/NaNO3 C. H2SO4/SO42- D. HCl/Cl2
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12/04/20

Which of the following is the correct balanced equation for the reaction of nitric acid with magnesium metal?
A.. HNO3 (aq) + Mg (s) → MgNO3 (aq) + H2 (g) B. H2NO3 (aq) + Mg (s) → MgNO3 (aq) + H2 (g) C. HNO3 (aq) + Mg (s) → MgO (s) + NH3 (g) D. 2 HNO3 (aq) + 2 Mg (s) → 2 MgNO3 (aq) + H2 (g)E. 2 HNO3 (aq) +... more
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12/04/20

CN- (aq) + H2O (l) ⇔ HCN (aq) + OH- (aq) Identify the BrØnsted-Lowry acid in the equation above.
A. HCN B. CN- C. OH- D. H2O
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12/04/20

Which of the following represents an appropriate buffer system?
A. HCl and KOH B. NaOH and H2O C. H2CO3 and NaHCO3 D. NaNO3 and HNO3 E. H2SO4 and Na2SO4
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12/04/20

Calculate the [OH-] of a solution with a pH of 5.6.
A. 5.6 x 10-14 M B. 4.0 x 10-9 M C. 3.1 x 10-8 M D. 2.5 x 10-6 M
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12/04/20

How do I find pressure?
A sample of gas trapped by a moveable piston has a volume of 57.0 L and a pressure of 2.35 atm at 273 K. If the volume of the gas decreases to 14.0 L as the temperature is increased to 327 K, what... more
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12/04/20

16.3 g of an imaginary compound X is dissolved in enough water to produce 471.5 mL of solution. Molar mass of the compound X = 41 g/mol. Calculate the concentration of the solution (molarity M)

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12/04/20

How would you draw the Lewis Dot Diagrams for elements 21-30?
I am confused about this since elements 21-30 all have 1 or 2 valence electrons. They do not all have the same Lewis Dot diagrams right?
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12/04/20

how to solve this problem

A solution is made by dissolving  of nonelectrolyte solute in  of benzene. Calculate the freezing point,  and boiling point,  of the solution. Constants can be found in the .
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12/03/20

calculate the mass of a solute

calculate the mass of solute ( in grams) of a 0.107m solution that contains 426.93 ml of water. the solute has a molar mass of 119.73 g/ mole.
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12/03/20

What is the pH of a 0.280 M solution of trimethylammonium chloride ((CH3CH2)NH3Cl)? Kb=5.6×10^-4 the answer is 5.7 but i need the work shown
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12/03/20

PLEASE HELP ASAP
Exactly 500.0 mL of a solution containing 316.2 ppm of Ba(NO3)2 is mixed with 150.0 mL of 0.047 M Al2(SO4)3 solution. (N: 14.0 ; O:16.0; S:32.0; Al:27; Ba:137 g/mol)What mass of solid BaSO4 is... more
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12/03/20

PLEASE HELP ASAP
Calculate the pH of the following solutions,0.0040 M benzoic acid (Ka= 6.28x10-5)prepared by adding 100 mL of 0.0500 M NaOH to 50 mL of 0.100 M HOCl (Ka= 3.0x10-8)0.012 M HClO4.please write the... more
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12/03/20

PLEASE HELP ASAP
Calculate the concentration of the solution that 40.0 mL of the 22% (w/w) NH3 (17,0 g/mol) solution with a density of 0.870 g/mL is diluted to 300 mL.PLEASE WRITE THE SOLUTION WITH STEPS
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12/03/20

Please Help ASAP
Iodine in a sample containing iodine and chlorine ion is converted to the iodate ion adding excess amount of bromine.-3H2O +3Br2 + I - <-----> 6Br‾ + IO3‾ +6H+Then remaining bromine is... more
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12/03/20

Which ionic compound has highest lattice energy
KBrCaOBaOCrSFePWhich would have highest lattice energy and why?
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12/03/20

Using chemical equations, show how the triprotic acid  ionizes in water. Phases are optional.
Using chemical equations, show how the triprotic acid  ionizes in water. Phases are optional.Ka1:Ka2:Ka3:
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12/03/20

What subshells will be available for electrons to occupy
Considering all electrons are in the ground state, for an energy level n=3, what subshells will be available for electrons to occupy for a neutral chromium atom
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12/03/20

 Given the following reaction:
Mg(OH)2 + 2HCl → MgCl2 + 2H2OHow many grams of MgCl2 will be produced from 9.0 g of Mg(OH)2?Mg(OH)2 = (58.31g/mole)MgCl2 = (95.21 g/mole)
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12/03/20

calculate molality using densities

A 0.160 M aqueous solution has a density of 8.86 g/ml. The solute's molecular weight is 299.49 g/ml. The density of water is 1.00 g/ml. Calculate the molality of this solution.
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