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The heat of combustion of CH4 is 8904 kJ/mol also the heat capacity of H2O is 75.2 J/mol×K. Determine the volume of methane measured at 298 K and 0.790atm needed to convert 1.33L of water at 298 K to water vapor at 373 K.
If 17.8 grams of KOH dissolve in enough water to make a 198-gram solution, what is the concentration in percent by mass.
what is the percent relative error? Please explain by showing work. Are these measurements more precise or more accurate? What is the purpose of repetition in measurements?
What are the oxidation number of the central atom of the following species. Please explain how to do this.
You carefully weigh out 20.00 g of CaCO_3 powder and add it to 81.00 g of HCL solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 92.80 g . The relevant equation is
in a 100 ml sample of buffer solution made of propanoic acid concentration .35m and sodium propanoate concentration
Siler metal crystalizes in a face-centered cubic lattice with L as the length of one edge of the unit cube. The center-to-center distance between nearest Silver atoms is....L/2 or 2 1/2L or 2L or L/2 1/2 or none of the above
Compute the pH of the solution that results while 60mL of 0.100 M NH3 is mixed with 40mL of 0.200 M NH4Cl.
an unknown gas composed of a diatomic molecule effuses at a rate that is only 0.355 times as fast as that of oxygen gas
The following ions contain the same number of electrons. Rank them in order of decreasing ionic radii.
A galvanic cell is formed by connecting an iron (III)/ iron metal electrode to a zinc (II)/ zinc metal electrode through a suitable salt bridge.
Explain what is the molality of a solution that contains 3.0g urea (molecular weight=60 amu) in 100g of benzene
Calculate Qsp for calcium flouride (Ksp=3.9 x 10^-11) when 230.0 mL of a 0.00790 M solution of Ca(NO3)2 is added to 275.0 mL
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