Chemistry

A mixture of helium and oxygen gas is expanded from a volume of 90.0L to a volume of 97.0L, while the pressure is held constant at 40.0atm. Calculate the work done on the gas mixture. Round your answer to 2 significant digits, and be sure it has the correct sign (positive or negative).
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river water stored behind a dam is best described as a form of . group of answer choices potential energy kinetic energy thermodynamics entropy chemical energy
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Consider the combustion of methane, CH4:Suppose 2.8 moles of methane are allowed to react with 5.0 moles of oxygen.How many moles of CO2 can be made from this reaction?CH4+202 CO2+2H2O(Answer should have three significant figures).
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Select the structure that corresponds to themolecule name:3,4,4-trimethyl-2-pentanoneB.A. O||CH3CCHC(CH3)3C. both
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a sample of gas occupies a volume of 1.820 liters at stp. what pressure, in atmospheres, would it exert if it transferred to a 1.425 liter vessel in which the temperature is raised to 25.2 ?
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if the density of ocean water at a depth of 10,000 m is 1.071 g/ml and if 25.0 g of water at that depth contains an additional 190 mg of kcl, what is the molarity of kcl? 8
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part 3: the amount of sodium chloride in the original mixture can be determined directly by subtracting the mass of the empty beaker from the total mass of the beaker with the sodium chloride after evaporation. alternatively, the mass of sodium chloride can be determined indirectly by subtracting the masses of ammonium chloride and sand from the initial mass of the mixture.
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Which is a benefit of using synthetic polymers, such as nylon?Synthetic polymers are lightweight.Synthetic polymers are produced in small quantities.Synthetic polymers are biodegradable.Synthetic polymers are inexpensive to recycle.
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Which student's question would be the MOST useful to determine this?Student 2, because only Bronsted-Lowry bases will neutralize acids.Student 3, because the pOH can be used to calculate the pH of the base.Student 4, because a Bronsted-Lowry base always accepts a proton from an acid to form a conjugate acid.Student 1, because if the base reacts with an acid and produces water and a salt it is a Bronsted-Lowry base.
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hello I need help to calculate the corresponding stoichiometric mass in milligrams of CaCO3the answer to number 8 is 2.72 moles and I'll take a picture of equation 2
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Classify the following acids as monoprotic, diprotic, or triprotic.H2CO3HBrH2SO4H3PO4
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a compressed air tank used by scuba divers has a volume of 8.0l at a pressure of 1.4 x10^2 atm. what volume would the air in the tank occupy at a pressure of 742 torr
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Given that the concentration of ascorbic acid is ~0.001 M in lemon juice, is this error significant? Why or why not?
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What happens to the shape and function of a protein if one of the amino acids is replaced with a different type of amino acid?.
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Which is the best title for these notes?Famous ExperimentsTheoriesLawsFamous Hypotheses
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The table below shows the composition of four atoms. Atom! Protons! Electrons! Neutrons! Mystery Atom 1! 15! 15! 15! Mystery Atom 2! 17! 16! 15! Mystery Atom 3! 23! 23! 23! Mystery Atom 4! 23! 24! 22! Based on the information in the table, which two atoms are of the same element?
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Can you help me with #2 based on the solutions from #1.
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WILL GIVE YOU BRAINIEST Write an obiective summary of the Helen Keller text, From The Story of My Life.Write a paragraph that explains what the text is about. Be sure to include the title and author's name.When writing an objective summary:Do not write a page-by-page recap. A summary should give the reader an idea of what the text is about without completely retelling the story.Do not simply write a statement about the topic like - It is about a woman who is blind and deaf.It should include details.The summary must be in your own words, but it has to be unbiased and not include opinions, experiences, or prior knowledge. Do not plagiarize.
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9. Applying Concepts Explain why it isn'tpossible for an atom to have a mass numberof 10 and an atomic number of 12.I feel like its a no because the number of neurons would be -2, since you subtract the mass number and the atomic number
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i need help with chemistry equation
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Which of the following is a part of the heating curve?
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where would the largest jump in ionization energies be for oxygen (with the loss of how many electrons?)
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How many atoms of He can a balloon that has a 21 cm diameter hold? The density of Helium is 1.18 g/L. (Assume the balloon is a sphere)
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For the following situations, indicate if the pressure would increase, decrease, or remain unchanged. In a closed glass bottle, a molecule splits into two new molecules. Is it increase,decrease or remained uncharged.
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