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A 2.446 g sample thought to contain only one volatile substance, MgCO3, was heated in a nitrogen atmosphere for 30 minutes. After cooling, the residue weighed 2.21 g. Calculate the % of MgCO3 in the sample.
How many grams of NH4Cl must be added to 424 mL of a 0.69 M solution of NH3 to prepare a pH = 9.00 buffer.
A swimming pool measures 25 meters wide by 145 meters long by 1 meters deep. How many gallons of water are required to fill the pool?
Calculate the entropy of unfolding of lysozyme at 25 oC, given that the difference in PCof unfolding is 6.28 kJ/mol/K at both 25 oC and 75 oC. Hint: consider a path of 25 oC (folded)?75.5 oC(folded) ?75.5 oC(unfolded) ?25 oC(unfolded).
Consider a solar with no dye where TiO2 is insted the light-absorbing species. the energy required to exite an electron in TiO2 is 3.21 eV. A. A) calculates the minimum wavelength of light required to excite an electron in TiO2.
An aerosol can has a gas pressure of 138 kPa at 293 K. Calculate the pressure when the can is heated to 506 K.
When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass.
Suppose that you have a 2.0 L sample of hydrogen at 1.00 atm and 59°C. If you heat the sample to 84°C and it expands to a volume of 3.7 L, what will the final pressure be?
The cube has an edge length of 0.26 ± 0.03 m. The volume of a cone is 1/3(pie)r^2h . What is the volume and uncertainty of the added water?
A powder contains FeSO4·7H2O (molar mass = 278.01 g/mol) among other components. A 3.585-g sample of the powder was dissolved in HNO3 and heated to convert all iron to Fe3
What is the fractional conversion of ethane? b) What is the production rate of ethanol?
What are the equations for Tin (IV) Chloride reacting with each of these? (ethanol, toluene, NaOH, dilute, HCL and conc HCL)
The problem: CaCO3 can be roasted to produce CaO and CO2. This reaction is carried out in a flash connected to an open-end mercury manometer when the atmospheric pressure is 754 torr
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