315 Answered Questions for the topic General Chemistry

General Chemistry

10/15/18

Molecular formulas
Some of the formulas below could be either molecular or empirical formulas; however, some could only be molecular formulas. Which of the following formulas must be molecular formulas? Select all... more
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10/05/18

What it the pH of 0.37M KC6H7O2(aq)? Given pKa of 4.77.
Sorbic acid HC6H7O2 (pka = 4.77), is widely used in the food industry as a preservative. For example it's potassium salt, (potassium sorbate) is added to cheese to inhibit the formation of mold.... more
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10/03/18

How long will it take?
It took 6.3 minutes for 25 mL of argon to reach the end of an effusion tube with a porous barrier. How long will it take for 25 mL of CHCl3 to effuse throuh the tube under the same conditions?
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General Chemistry

10/03/18

A student completed the synthesis of salicyclic acid just as we did in our laboratory activity. They used 2.925 g of methyl salicylate, 3.5 mL of 6.0 M NaOH, an
A student completed the synthesis of salicyclic acid just as we did in our laboratory activity. They used 2.925 g of methyl salicylate, 3.5 mL of 6.0 M NaOH, and 4.1 mL of 6.0 M HCl. They obtained... more
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General Chemistry

09/30/18

Net ionic equation answer
When aqueous solutions of potassium carbonate and chromium(II) chloride are combined, solid chromium(II) carbonate and a solution of potassium chloride are formed. The net ionic equation for this... more
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09/30/18

Chemistry homework help
Write a balanced metathesis equation for the reaction which takes place when the two solutions described below are combined and then determine the amount of solid product produced. 250.0 ml of... more
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General Chemistry Chemistry

09/30/18

Chemistry HW
The metathesis reaction between sodium carbonate and cobalt (III) chloride is shown below 3 Na2CO3 (aq) + 2 CoCl3 (aq) ➝ Co2(CO3)3 (s) + 6 NaCl (aq)How many grams of solid cobalt (III) carbonate... more
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General Chemistry

09/29/18

Finding pH of a buffer solution
100 mL of buffer solution that is 0.15M HA (Ka= 6.8x10-5) and 0.20M NaA is mixed with 18.8mL of 0.25M HCl. What is the pH of the resulting solution?
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General Chemistry

09/09/18

General chemistry
A patient is receiving 30 mL/hr IV drip of an antibiotic. If the bag contains 1 g of compound in 500 mL of solution, how much drug is the patient receiving in 45 minutes?
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General Chemistry

09/08/18

General chemistry
Suppose on average 2 penguins have 750000 feathers between them, 1 pillow requires 1283 feathers, 3 hippies need 16 pillows total to sleep, a treehouse can fit 8 hippies, and you need 322 planks of... more
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General Chemistry

09/08/18

General Chemistry
While prospecting in the woods, you find a solid gold nugget. You don’t have a scale to weigh it, but you remember that the density of gold is 19.2 g/mL and you have a graduated cylinder. When you... more
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General Chemistry Chemistry Organic Chemistry Algebra

09/05/18

2.70 g/cm^3 converted to kg/m^3
for my answer on my calculator I get 2700 g/m^3     But I’m not sure if I write 270. g/m^3 as my final answer because of the rounding to the least significant figure rule which we started with 2.70... more
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08/23/18

Carry out the following operations and express the answer with the appropriate number of significant figures: [(285.3x10^5)-(1.200x10^3)]x2.8954
How do I solve this problem with the scientific notation? And when it comes to the rules of significant figures, do I use the rule pertaining to subtraction or the one pertaining to... more
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General Chemistry

08/21/18

Thanks for your help
Ammonia can be reacted with carbon dioxide to form urea, as shown below. If 170 g ammonia were consumed in a reaction with excess carbon dioxide, what mass of urea could be produce?  The molar... more
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General Chemistry

08/21/18

C7H6O3 + CH3COOH —> C9H8O4 + H2O
C7H6O3 + CH3COOH —> C9H8O4 + H2OThe above reaction between salicylic acid (C7H6O3) and acetic acid shows the synthesis of aspirin (C9H8O4). If the percent yield of the reaction is 33.3% then... more
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General Chemistry Chemistry

06/25/18

what is the concentration of NaCl in a solution, if titration of ...
what is the concentration of NaCl in a solution, if titration of 15.00mL of the solution with 0.257 M AgNO3 needs 20.22 mL of the AgNO3 solution to reach the end point?
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General Chemistry Stoichiometry

05/28/18

A 1.60-g sample of an oxide of bromine is converted to 2.685 g of AgBr. Calculate the empirical formula of the oxide.
Please show work.  Thank you!
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General Chemistry

04/20/18

Exactly 100 ml of 0.15 M acetic acid (HC2H3O2, Ka=1.8x10^-5) are titrated with a 0.20 M NaOH solution.Calculate the pH for
(a) the initial solution (HC2H3O2 solu) (b) the point at which 37.5 ml of the base has been added. (c) equivalence point  (d) after adding 80.0 ml of 0.20 M NaOH 
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General Chemistry

04/20/18

Calculate the molar solubility of PbI2 (Ksp = 1.4x10^-8)in (a) Pure water (b) On 0.50 L of solution that contains 15.0 g of FeI3 .
Please answer in details with all steps. 
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General Chemistry

04/11/18

A cylinder is filled to 10.0mL and an object is placed, rising the water to 23.7mL. What is the volume of the object in cm3?
General chemistry - SI units - Volume - Derived Unit
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General Chemistry

03/13/18

How many grams to make 1 liter of a 2.0 x 10-5 M crystal violet solution
How many grams to make 1 liter of a 2.0 x 10-5M crystal violet solution
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General Chemistry Chemistry

12/07/17

How many milligrams should one dose for this child contain?
Tetracycline Elixir, an antibiotic, is ordered for a child weighing 52 lbs. at a dosage of 8.0mg per kilogram of body weight q.d. How many milligrams should one dose for this childcontain?
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General Chemistry Chemistry

12/01/17

Can you answer this? Look at the label on a bottle of Mylanta and identify the bases responsible for the antacid acid?
Heartburn, a burning sensation in the lower throat and above the stomach, is caused by the reflux or backflow of stomach acid into the esophagus (the tube that joins the stomach to the throat). In... more
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11/29/17

chemistry help
Calculate the emf of the voltaic cell: Concentration of Mg+2 (anode)  is 0.00100 M and Fe+3 (cathode) is 0.100 M   unsure how to find this
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General Chemistry Chemistry

11/28/17

What is the molarity of the HCl solution?
A 24.6 mL sample of HCl reacts with 33.0 mL of 0.222 M NaOH solution. What is themolarity of the HCl solution? (note: write the balance chemical equation)
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