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Calcium and Magnesium carbonates occur together in the mineral dolomite. Suppose you heat a sample of the mineral to obtain the oxides,CaO and MgO, and then treat the oxide sample with HCl. If 7.695g of the oxide sample requires 125 mL of 2,55 M HCl, CaO(s) + 2 HCl(aq)--->CaCl2(aq) + H2)(l) MgO(s) + 2HCl(aq)--->MgCl2(aq) + H2O(l) What is the weight percent of of each oxide (CaO and MgO) in the sample?
degree C is mixed with 35.2 g/mL of water (density = 1.0 g/mL) initially at 24.4 degree C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?
What are bonding theories? Why are they important? What may they be used for. HI has a force contents of 314 Nm^-1 and a bond length of 160.92 pm.
What would the product be in an aldol condensation and dehydration reaction for 4-methoxybenzaldehyde
Which resonance structure for the SCN- ion and the COS molecule would you expect to be more stable
How much work is done reversibly compressing one mole of an ideal gas from a starting volume of 1L to a final volume of 250mL at a constant temperature of 293K? What is the change in entropy?
One way to isolate metals from their ores is to react the metal oxide with carbon as shown in the following reaction: 2MO(s) + C(s) → 2M(s) + CO2(g)
The isothermal compressibility of graphite is 1.56 × 10-7 bar-1. At what pressure is density equal to density of diamond?
Evaporating sweat cools the body because evaporation is endothermic and absorbs 2.44 per gram of water evaporated. Estimate the mass of water that must evaporate from the skin to cool a body by 0.30
If the outermost electron in a potassium atom were excited to a 4d-orbital and then fell to the same orbitals, describe qualitatively how the emission spectrum would differ from that of hydrogen (do not do any calculations). Explain your answer.
Calculate the equilibrium value of Pb+2(aq) in 1.00 L of saturated PbCl2 solution to which 0.250 moles of NaCl(s) has been added. Assume that no volume change occurs.
Calculate the wavelength in nanometers of the spectral line in the visible spectrum of hydrogen for which n1 = 2 and n2 = 3. What color is this line?
The water sample is put into a Nebulizer attached to an ICP Spectrometer and the absorbance peak measured at the proper wavelength of lead. Standards are also analyzed to produce a calibration curve for comparison
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