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A biology experiment requires the preparation of a water bath at 37.0°C (body temperature). The temperature of the cold tap water is 22.0°C, and the temperature of the hot tap water is 65.0°C. If a student starts with 70.0 g of cold water, what mass of hot water must be added to reach 37.0°C?
Write a chemical equation for the reaction whose enthalpy change is the standard enthalpy of formation, ?H of, of table sugar, sucrose, C12H22O11 (s).
What is the number of moles of atoms of oxygen contained in 49 grams of sulfuric acid, H2SO4?
The vapor pressure of bromine, Br2(l) at 25°C is 228 mm Hg.If 2.00 g of liquid bromine is used, what is the final pressure in a 2.0 L flask?
although they were formerly called the inert gases at least the heavier elements of group 8 do form relatively stable
a set of data gave an average unpopped corn kernel mass of 0.12 grams. how many kernels are in a pound 454 g of
Hard water contains alkaline earth cations such as Ca2+ which reacts with CO32- to form insoluble deposits of CaCO3. Will a precipitate of CaCO3 form if a 250mL sample of hard water having [Ca2+] = 8.0x10-4M is treated with the following
A sample of an unknown gas effuses in 10.1 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.16 min. What is the molar mass of the unknown gas
It is stated that more than one unit cell can be chosen for a structure. If they represent the same structure, however, the unit cells must have the same types of atoms
Using the balanced equation: 2NaCl(s)+ 1H2SO4(aq)= 2HCl(aq)+1Na2SO4(aq) a. If 20. G of NaCl are used, and only 5.6 g of HCl are isolated, what is the percent yield of HCl? b. If only 5.6 g of HCl are obtained, how many grams of Na2SO4 must also ha..
the best means of personal protection from radiation for emergency responders is the implementation of three basic
Calculate the density of a piece of wood that is found to have a mass 2.34 g and is placed in a graduated cyclinder with 34 ml of water, which then rises to 50 ml with the block of wood
Instead of 6 M NaOH being added to the test solution, 6 M HCl is added. How will this affect the test for the presence of ammonium ion in the solution? Explain.
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