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The end position of the arm must be deteermined accurately in order to weld the components at the precise position. a) In selecting the material for the arm of such robots, what factors must be c
A 0.0125-g sample of a gas with an empirical formula of CHF2 is placed in a 165-mL flask. It has a pressure of 13.7 mm Hg at 22.5 ?C. What is the molecular formula of the compound?
When chemists are preparing dilute acid solutions in water they follow the proverb "Always add acid" Explain why this is a good idea. What would happen if the water is added to the acid?
The Henry's Law constant KH for O2 in water at 20 degrees C is 1.28 x 10-3 mol L-1atm-1. How many grams of O2 will dissolve in 2.0 L of H2O that is in contact with pure O2 at 1 atm?
A 5.05g sample of a copper substance was heated in air and 6.32g of copper II oxide was formed. what was the formula of the orginal copper substance?
In an experiment, 6.00 g of Mg(s) was reacted completely with O2(g) to form MgO(s) and 148.5 kJ of heat was evolved. What is the molar enthalpy in kJ/mol of formation of MgO(s)?
A student titrates a sulfuric acid solution of unknown concentration with 0.15 M sodium hydroxide. The titration requires 34.8 mL of the sodium hydroxide solution to completely neutralize 10.00 mL o
A 10.0 mL sample of household ammonia solution required 33.55mL of 0.450 M HCl to reach neutralization. Calculate (a) the molar concentration of the ammonia and (b) the mass/mass percent concentrati
If the rate of disappearance of N2O5 is equal to 1.60 mol/min at a particular moment, what is the rate of appearance of NO2 at that moment?
A sodium hydroxide solution is standardized using 0.502g of solid oxalic acid, H2C2O4. Find the molarity of the base if 30.50 mL are required for the titration to a phenolphthalein endpoint.
The specific heat of iron is .443 J/g/K. What mass of steam at 100 degrees celcius must be converted to water at 100 degrees celcius to raise the temperature of a 150 g iron block from 25 degrees c
Two determinations of the dissolved oxygen content of a 200 mL sample of water made five days apart, gave 5.3 ppm and 2.2 ppm of dissolved O2, respectively. What is the biological oxygen demand o
An iron meteorite was analyzed for isotopic Argon Content. the amount of 36Ar was 0.200mm3 (STP)per kg of meteorite in each 36Ar atom had been formed by a single cosmic event, how many such events m
A 1.885g solid sample containing some FESO4 is dissolved in water. The resulting solution is acidified and titrated to the endpoint with 20.48 mL of 0.02540 M K2Cr2O7. What is the percent iron(II
Identify the element of lowest atomic number whose electron configuration contains four completely filled sublevels.
A 73.8 gram sample of CaSeO42H2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?
If your lab partner added slightly too much water in step 5 of preparing the penny solution. Will your final percentage of copper in the penny be too big, too small, or unchanged? clearly explain y
Oxygen reacts with CO to form CO2 as the only product. The proposed first step of the mechanism is: What second step is required to give a satisfactory mechanism?
A 325ml sample of gas is intially at a pressure of 721 torr and a temperature of 32 cecius. If this gas is compressed to a volume of 286 ml and the pressure increases to 901 torr, what will be the
What would the predicted temperature increase of a bomb calorimeter (heat capacity of 1450 J/C) that is submersed in 2.00 L of water (assume d(water) = 1.00 g/mL) be if 0.055 mol of a hydrocarbon (e
The precipitated AgCl was washed, collected, dried and found to have a mass of 1.10 grams. Calculate the percent chloride in the unknown.
Question: At a certain temperature the vapor pressure of pure benzene and pure toluene are 380 torr and 130 torr, respectively. If 7.97 mol benzene is mixed with 5.90 mol toluene, what is the total
A 35.0 mL sample of an unknown HClO4 solution requires 41.3 mL of 0.102 M NaOH for complete neutralization. What was the concentration of the unknown HClO4 solution? The neutralization reaction is:
Decomposition of KClO3 is sometimes used to prepare small amounts of O2 in the laboratory: 2KClO3(s) 2 KCl(s) + 3 O2(g). How many grams of O2 can be prepared from 4.50 g of KClO3?
List the following compounds in order of increasing lattice energy (from least negative to most negative): LiI, LiF, CaO, RbI.