214 Answered Questions for the topic College Chemistry

02/26/21

In a collision of sufficient force, automobile air bags respond by electrically triggering the explosive decomposition of sodium azide (NaN3) to its elements. A 29.4−g sample of sodium azide was...
decomposed, and the nitrogen gas generated was collected over water at 26°C. The total pressure was 733.8 mmHg. How many liters of dry N2 were generated?
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College Chemistry Chemistry Moles General Chemistry

02/12/21

I keep getting lost on this question: In a combination reaction, 1.54 g of lithium is mixed with 6.56 g of oxygen.....
a) Which reactant is present in excess? I got Lithium being the LR. b) How many moles of the product are formed?I got 3.32 g Li2Oc) After the reaction, how many grams of each reactant and product... more
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College Chemistry Chemistry Moles General Chemistry

02/10/21

In a combination reaction, 1.62 g of lithium is mixed with 6.87 g of oxygen. Answer a, b, and c. I am lost.

a) Which reactant is present in excess?b) How many moles of the product are formed?c) After the reaction, How many grams of each reactant and product are present?Blank g LiBlank g O2Blank g LI2O
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02/10/21

A mixture of KClO3 and KCl with a mass of 0.950 g was heated to produce O2. After heating, the mass of residue was 0.740 g. Assuming all the KClO3 decomposed to KCl and O2, calculate the mass percent
of KClO3 in the original mixture
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02/10/21

A person's blood alcohol (C2H5OH) level can be determined by titrating a sample of blood plasma with a potassium dichromate solution. The balanced equation is
16H+(aq) + 2Cr2O72-(aq) + C2H5OH(aq) > 4Cr3+(aq) + 2CO2(g) + 11H2O(l)If 35.46 mL of 0.05961 M Cr2O72- is required to titrate 27.90 g of plasma, what is the mass percent of alcohol in the... more
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02/10/21

Give the oxidation number of antimony in the following:
a) SbH3b) H2SbO4-c) SbCl3
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02/10/21

How many milliliters of 0.593 M HCl are needed to react with 22.4 g of CaCO3?
2HCl(aq) + CaCO3(s) > CaCl2(aq) + CO2(g) + H2O(l)I got 755.48 mL but I know that is wrong.
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02/09/21

Sodium hydroxide is used extensively in acid-base titrations because it is a strong, inexpensive base. A sodium hydroxide solution was standardized by titrating 42.18 mL of 0.1753 M...
standard hydrochloric acid. The initial buret reading of the sodium hydroxide was 1.08 mL, and the final reading was 31.51 mL. What was the molarity of the base solution? I got 0.2212 M but it... more
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02/09/21

The mass percent of Cl− in a seawater sample is determined by titrating 25.00 mL of seawater with AgNO3 solution, causing a precipitation reaction....
An indicator is used to detect the endpoint, which occurs when a free Ag+ ion is present in a solution after all the Cl− has reacted. If 57.50 mL of 0.2036 M AgNO3 is required to reach the... more
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College Chemistry Chemistry Mass General Chemistry

02/05/21

Calculate the densities of both the water and the isopropyl alcohol and the percent error...
The accepted value for the density of water is 1.00 g/mL and the accepted density for isopropyl alcohol is 0.786 g/mL.percent error = experimental density minus accepted density divided by accepted... more
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College Chemistry Chemistry Volume Mass

02/05/21

Calculate the density of the magnet and bolt...
Magnet:Mass (g) = 7.93 gInitial volume of graduated cylinder = 7.00 mLFinal volume of graduated cylinder = 9.00 mLObject volume = 2.00 mLDensity (g/mL) ?Bolt:Mass (g) = 6.61 gInitial volume of... more
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College Chemistry Chemistry Mass General Chemistry

02/02/21

A certain oxide of vanadium is 32.02% oxygen by mass. Determine the empirical formula of this compound.
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02/02/21

A 2.004-gram sample of calcium is completely reacted with oxygen to produce 2.804 g of calcium oxide. What is the mass percentage of oxygen in calcium oxide?
I got 28.5 percent. Is that correct?
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College Chemistry Math Chemistry General Chemistry

02/02/21

A graduated cylinder is filled with water to a volume of 44.0 mL. When an irregularly shaped solid piece of metal was added, the volume increased to 47.2 mL. If the piece of metal had a mass of 45.5 g
what is the density of the metal?
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02/02/21

Which of the following relationships is incorrect?
I am really bad at this stuff. a) 10-6 milliliters = 1 literb) 1 microliter = 106 litersc) 1 gram = 10-3 kilogramsd) 100 centimeters = 1 meter
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02/02/21

How many significant figures does the result of the following operation have? 8.5201 + (1.932 x 5.45)
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College Chemistry Chemistry Moles General Chemistry

02/01/21

Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s) → 2K2O(s) + 2N2(g) + 5O2(g) to produce 71.8 kg of O2, how many...
a) Moles of KNO3 must be heated?b) Grams of KNO3 must be heated?
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College Chemistry Chemistry Scientific Notation Mass

02/01/21

Allyl sulfide gives garlic its characteristic odor. Give the mass and number of carbon atoms.
a) The mass in grams of 2.62 mol of allyl sulfide. Answer in scientific notation.b) The number of carbon atoms in 72.8 g of allyl sulfide. Answer in scientific notation.
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College Chemistry Chemistry Mass General Chemistry

01/31/21

Calculate the mass in milligrams of 3.16 × 10 ^ 20 formula units of Bi(NO3)3 · 5H2O. Enter your answer in scientific notation.
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College Chemistry Math Chemistry General Chemistry

01/29/21

Carry out the following calculation, making sure that your answer has the correct number of significant figures:
7.80 g divided by 15.9 g minus 8.37 g
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College Chemistry Math Chemistry General Chemistry

01/29/21

A cylindrical tube 14.7 cm high and 1.60 cm in diameter is used to collect blood samples. How many cubic decimeters (dm3) of blood can it hold (V of a cylinder = πr2h)?
Give your answer to the correct number of significant figures. The answer is blank dm3Not scientific notation.
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01/29/21

Convert the following into correct scientific notation:
I got the numbers right, but not the correct powers.a) 445.5 X 104 I got 4.455 X 10 to the? It is not power 4 and it is not power 2b) 7804.7 X 10-6 I got 7.8047 X 10 to the? It is not power -6 and... more
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College Chemistry

11/30/20

Heat Fusion help
When 27.2 g of solid A, at its melting point of 34.0 °C, was added to 62.7 g of liquid A at51.2 °C, the mixture cooled to 35.0 °C, with no solid remaining. Given the specific heat ofliquid A (s =... more
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College Chemistry College Structure Iupac Naming

10/06/20

College Chemistry Drawing The Structures for IUPAC Names

Draw the Condensed or Expanded structure formula for the following  4- bromo – 2-pentanone     Propyl ethanoate     2-chloro propanamine
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College Chemistry Chemistry Chem General Chemistry

04/30/20

Finding the difference in solubility
Consider the solubility of Ca(OH)2 in each of the following solutions. For each solution, indicate whether the Ca(OH)2 solubility will increase, decrease, or not change as compared to the... more
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