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1) A and B react according to the scheme 2A + B → C. The reaction is highly exergonic, that is, it goes to completion when A and B are allowed to react. 2.000 tons of A and 1.00 ton of B were mixed in a kettle. A balance, the maximum capacity of which is 0.500 tons with 1% precision was used to weigh A and B. Assume that the molar masses of all chemical species are equal. What is the maximum possible amount of unreacted reactants?
2) An experiment is performed to determine the force constant k of a spring by measuring its length as a function of the applied load. The following data are obtained:
Mass (g)
Length (cm)
10.0
5.1
110.0
36.57
20.0
8.8
120.0
38.57
30.0
10.9
130.0
43.55
40.0
14.3
140.0
46.88
50.0
18.0
150.0
49.01
60.0
20.56
160.0
52.20
70.0
23.94
170.0
54.19
80.0
26.94
180.0
58.52
90.0
30.92
190.0
61.84
100.0
33.91
200.0
64.50
Report the values of L0 (initial length) and k (force constant) and their associated uncertainties with 95% confidence limit.
3) Each student measured the lengths of a pencil using calipers. Record and combine your data into one table. Calculate the average value for the length of the pencil. Calculate the standard deviation.
4) From the data below calculate the viscometer constant for 716L viscometer (the viscometer constant is the hypothetical time required for water to flow through viscometer capillary). Water was used to calibrate 100 viscometer, which was in turn used to find the viscosity of liquid 1. Then, liquid 1 was used to calibrate 200 viscometer, which was used to determine the viscosity of liquid 2, and so forth. Use the equation η1/η2 = t1/t2 for the calculations.
At 200 deg C, K = 0.009 for the reaction: NH4SH (s) -> NH3 (g) + H2S (g). A sample of solid NH4SH is placed into a container and allowed to equilibrate. What is the equilibrium partial pressure of ammonia, assuming some solid NH4SH remains
an adult person radiates heat to the surroundings at about the same as a 100-watt electric incandescent lightbulb. what is the total amount of energy in kcal radiated to the surroundings by an adult in 24 hours?
consider the titration of 100.0 ml of 0.200 m acetic acid ka 1.8 10-5 by 0.100 m koh. calculate the ph of the
question the electrode of a ph meter is placed in a sample of urine and a reading of 7.9 is obtained. is the sample
Molecular weight and mole concept explained in this solution, The molecular weight of NaOH is 40. the molecular weight of a widely used buffer, HEPES, is 255
Compound 1, was found to consist of C, H, N, and Cl. (only one Cl) Elemental analysis of 61.1% C, 2.9% H, and 10.2% N. IR spectra displayed absorbances at 2215, and 1605. Deduce the structure of this compound.
used to fill a weather balloon in order to lift equipment into the stratosphere. To what maximum pressure (in atm) could a 271 L balloon be filled?
What mass of SiC is formed from the complete reaction of 6.63 mol of carbon?
A 50.00-mL sample of .1000 M KOH is titrated with .287 M HNO3. Calculate the pH of the solution after 52.00 mL of HNO3 is added.
calculate the percent of a strontium sample left after 100 years. the half-life of strontium-90 is 28.1
Explain which one of the following conditions is always met at the equivalence point of the titration of amonoprotic weak base with a strong acid
cadaverine a foul smelling substance produced by the action of bacteria on meat contains 58.55 c 13.81 h and 27.40 n by
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