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Problem- A homeowner uses 4.00 x 10^3 m^3 of natural gas in a year to heat a home. Assume that natural gas is all methane, CH4, and that methane is a perfect gas for the conditions of this problem, which are 1.00 atm and 20 C. What is the mass of gas used?
Please write answer for each section to receive points
Which of the following nuclides have magic numbers of both protons and neutrons: (a) helium-4, (b) oxygen-18, (c) calcium-40, (d) zinc-66, (e) lead-208
What is the density of a substance if a 2.50mL sample has a mass of 0.880g at room temperature? ( show calculations) What is the specific gravity of the substance?
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 11.12% naphthalene by mass. Calculate the vapor pressure at 25?C of hexane above the solution. The vapor pressure of pure hexane at 25?C is 151 torr.
How does adding a small amount of a Grignard reagent solution to a Grignard reaction help the reaction get started
How do you calculate solubility percentage? For example if a out 5 grams of sugar in 50 ml of water, with the temperature of water being 20 degrees.
To treat a thyroid tumor, a patient must be given a 170-mCi dose of iodine-131, supplied in a solution containing 41 mCi/mL. What volume of solution must be administered per dose?
Calculate the enthalpy change, change of H, for the process in which 37.1 g of water is converted from liquid at 4.4 degrees C to vapor at 25.0 C.
A piece of metal of mass 20 g at 99?C is placed in a calorimeter containing 55.8 g of water at 23?C. The final temperature of the mixture is 30.4?C.
For the following electrochemical cell Co(s)| Co 2+ (aq, 0.0155 M)|| Ag+ (aq, 3.50 M)|Ag(s) Write the net cell equation. Phases are optional. Do not include the concentrations.
A nonelectrolyte solution adsorbs on an electrically neutral solid through a liquid. Two surfaces of this type are brought close to one another in the liquid such that they interact.
What is the relationship between the atomic numbers and the ionic radius of the elements in a group.
Activating effects: Using resonance contributors, explain why the methoxy group is an activator and an ortho/para director in electrophilic aromatic substitution A drawing would be helpful too
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