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Question- An experiment was done in order to determine the heat of fusion of ice. A student used a calorimeter consisting of a polyesteryne cup and a thermometer. The cup was weighed, filled halfway up with warm water, and then weighed again. The temperature of the water was measured and some ice cubes from a 0 degree C bath were added to the cup. The mixture was gently stirred as the ice melted and the lowest temperature reached by the water was recorded. The cup and its contents were weighed again. The purpose of weighing the cup and its contents at the end of the experiment
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If 8.0 moles of the gas A is placed in a 60.0 L tank with 1.0 moles of B at 0 degrees celsius and 1 atm, they react according to the equation. 2A(g) + B(g) ---> 3C(g) + D(g) How many moles are present in the tank when the reaction is complete
extrapolate this "cooling curve" back to the time of addition and find that the "final temperature" after mixing is 37.9 °C. What is the heat capacity of the calorimeter cup
Calculate the energy of a photon of electromagnetic radiation at the following frequency 103.7 (typical frequency for FM radio broadcasting) in J.
The amino acid glycine is often used for biochemical buffers. The amino group of glycing can exist in a protonated form or as a free base (pKa 9.6).
Question- Why might increasing taxes as a fiscal policy be a more difficult policy than the use of monetary policy to slow down an economy experiencing inflation?
A 1.241-g sample of a solid, weak, monoprotic acid is used to make 100.0 mL of solution. 50.0 mL of this solution was titrated with 0.08126-M NaOH. The pH after the addition of 30.29 mL of base was 4.86, and the equivalence point was reached with ..
If 17.5 moles of an ideal gas occupies 0.0455 cubic meters at 70.5°C, what is the pressure of the gas?
Calculate the pH of the final solution after 250 mL of a 0.157 mol dm-3 solution of HCl is added to 500 mL of a 0.103 mol dm-3 solution of NaCN (Ka HCN = 6.2 × 10-10).
Molecule with 3 single bonds and 1 lone pair of electrons around the central atom is predicted to have what type of molecular geometry? d. which of the following molecules is polar? PBr5, CCl4, BrF5, XeF2, XeF4 e. a sp3d hybridized central atom ha..
Nitrogen gas when combined with hydrogen gas forms ammonia gas according to the following equation N2(g) + 3H2(g) = 2NH3(g). Delta H(rxn)=-56 kJ. The delta H(rxn) was determined using Hess's Law and the following three related reactions:
what is the minimum pressure in kpa that must be applied at 25 degc to obtain pure water by reverse osmosis from water
The atmosphere becomes colder at higher elevation. As an average the standard atmospheric absolute temperature can be expressed as Tatm = 288 - 6.5 × 10?3 z, where z is the elevation in meters.
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