08/31/21

If 515 J of heat is added to a gas that does 218 J of work as a result, what is the change in the energy of the system?
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08/31/21

The boiling point elevation of a glucose solution is measured to be 1.34 °C. What is the molal concentration of this solution?
Some possibly useful constants for glucose (C6H12O6, 180.16 g/mol) and water are Kf = 1.86°C/m , Kb = 0.512°C/m, freezing point = 0°C, and boiling point = 100°C. Enter your value with 2 decimal values more
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08/30/21

Scientific Notation

1.) 30/ 60,000 x 0.052.) 450 x 0.008 x 0.2/ 20,000 x 40 x 0.18
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08/30/21

please give a step by step.
A molecular biologist measures the mass of cofactor A in an average yeast cell. The mass is 96.02 pg. What is the total mass in micrograms of cofactor A in a yeast colony containing 10^5 cells?... more
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08/30/21

Chemistry 2 problem
A 0.537 g sample of steam at 107.2 °C is condensed into a container with 5.55 g of water at 15.8 °C. What is the final temperature of the water mixture if no heat is lost? The specific heat of... more
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08/30/21

Chemistry (Please Help) TT TT TT
The jewelers’ mass unit for diamond is the carat. By definition, 1 carat equals exactly 200 mg.What is the volume of a 4.34 carat diamond? The density of diamond is 3.51 g/cm3 . Answer in units... more
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08/30/21

coffee virtual lab

During the summer after your first year at Carnegie Mellon, you are lucky enough to get a job making coffee at Starbucks, but you tell your parents and friends that you have secured a lucrative... more
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08/28/21

Which solution is more concentrated with the given concentration a 1% HCI solution b 1ppm HCI solution c the concentration of these solutions are equal

Which solution is more concentrated with the given concentrationa 1% HCI solutionb 1ppm HCI solutionc the concentration of these solutions are equal
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08/27/21

You are assigned to make a medicine for a certain disease.

Continuation... After countless days of researching on how to make the required medicine (let us name it chemical Chem) you have found out that you need to combine chemical A and chemical J.... more
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08/25/21

Balance the equation by inserting coefficients as needed. equation: ZnS + HBr -> ZnBr_{2} + H_{2}S ZnS+HBr⟶ZnBr2+H2S
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08/25/21

What is the formula for copper(II) phosphate? Capitalization and punctuation count. How many atoms of phosphorus are in 6.20 mol of copper(II) phosphate?
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08/25/21

How many moles of MgS2O3 are in 195 g of the compound? 195 g MgS2O3
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08/25/21

What is the mass, in grams, of 9.59×1024 molecules of methanol (CH3OH)?
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08/25/21

How many atoms are in 149 g of calcium?
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08/25/21

Finding density and volume
Iron has a density of 7.86g/cm3. Calculate the volume in dL of a piece of iron having a mass of 3.55kg. Express your answer in 3 significant figures.
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08/25/21

Finding density with g and mL
You add 7.6g of iron to 25.50mL of water and observe that the volume of them together is 26.47mL. Calculate the density of iron. Express your answer in 2 significant figures and appropriate units.
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08/25/21

Stoichiometry In chem 1215
Sulfurous acid is unstable in aqueous solution and gradually decomposes to water and sulfur dioxide gas H2SO3–>H2O+ SO2if 3.25g of sulfurous acid undergoes this reaction what mass of sulfur... more
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08/25/21

chemistry, stoichiometry and concentrations/ molar mass etc

A) Formalin is an aqueous solution that is made from dissolving formaldehyde gas, HCHO (g), in water. A saturated formalin solution has a concentration of about 30.92% (m/v). This concentration is... more
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08/25/21

Stiochoimtery Question

For the reaction below determine the limiting reagent, the theoretical yield and the percent yield given an actual yield of 4.5 grams. See the Technique Book Section 3.2 on page 35 for help with... more
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08/25/21

Convert the following to correct scientific notation
375 000 000 mg 875 km 0.000 000 000 125 mL
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08/24/21

Chemistry question on equilibrium
Consider the following reaction at equilibrium at 135oC: 2AB3(g) ⇌ A2(g) + 3B2(g) If 2.00 mol of AB3(g) were placed into a 10.0 dm3 container and the concentration of B2(g) at equilibrium was... more
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08/24/21

Chemistry Homework
According to the following reaction, how many grams of dinitrogen monoxide will be formed upon the complete reaction of 31.2 grams of ammonium nitrate?ammonium nitrate (aq) dinitrogen monoxide (g)... more
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08/24/21

Chemistry homework
According to the following reaction, how many grams of water will be formed upon the complete reaction of 28.0 grams of oxygen gas with excess hydrogen sulfide?hydrogen sulfide (g) + oxygen (g)... more
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08/23/21

Chemistry Homework
According to the following reaction, how many moles of water will be formed upon the complete reaction of 0.640 moles hydrogen sulfide with excess oxygen gas?hydrogen sulfide (g) + oxygen (g) water... more
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08/22/21

For NFPA diamond what represents 342 COR?
For NFPA diamond what represents 342 COR?
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