if you begin with 3.46 g of Fe, what mass in grams of O2 is required for complete reaction?
what is the theoretical yield of FeO3 in grams?
if 4.83 g of Fe2O3 are actually obtains, wht is the percent yield?
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1. If the outside flask is not dried after vaporizing the liquid, will the unknown's calculated molecular weight be too high or too low? EXPLAIN.
A. Assume the atmospheric pressue is 1 atm but the actual pressue is higher than 1 atm. How will this error affect the calculated molar mass of the unknown? EXPLAIN.
B. If the vapor'svolume were to be incorrectly recorded as 125ml, how will this error affect the calculated molarmass of the unknown? EXPLAIN.
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At a certain temperature, K for the reaction below is 7.5 L/mol.
2NO2(g) → N2O4(g)
If 2.0 moles of NO2 are placed in a 2.0 liter container and permitted to react at this temperature, what will be the concentration of N2O4 at equilibrium?
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Explain why absorption spectra for atomic species consist of discrete lines at specific wavelengths rather than broad bands for molecular species.
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1713
A 35.0-mL sample of 0.150 M acetic acid (CH3COOH) is titrated with 0.150M NaOH solution. Calculate the pH after the following volumes of base have been added.
a) 0 mL
b) 17.5 mL
c) 34.5 mL
d) 35.0 mL
e) 35.5 mL
f) 50.0 mL
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Equal volumes of 0.210 M weak base (Kb = 5.0× 10–9) and 0.210 M HCl are mixed. Calculate the pH of the resulting solution.
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What are some problems associated with determining the dose of airborne nanomaterials in a worker’s breathing zone?
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Obtain expressions for dU, dH, dA, and dG for an ideal gas and for a van der Waals gas.
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A researcher attempted this reaction with H2SO4 instead of H3PO4 and noticed a 3rd product. How did this product form from just switching the acid catalyst?
the E1 reaction for the lab:
2-methylcyclohexanol with H3PO4 to make 2-methycyclohexane product. The H3PO4 solution will instead be H2SO4.
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A vitamin C tablet containing 250 mg of ascorbic acid (C6H8O6; Ka=8.0
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Consider these reactions, where M represents a generic metal
1. 2M(s)+6HCl(aq)------>2MCl3(aq)+3H2(g) Delta H1=-749.0 KJ
2. HCl(g)------->HCl(aq) Delta H2=-74.8 KJ
3. H2(g)+Cl2(g)------->2HCl(g) Delta H3=-1845.0 KJ
4. MCl3(s)-------->MCl3(aq) Delta H4=-298.0 KJ
Use the information above to determine the enthalpy of the following reaction.
2M(s)+3Cl2(g)----->2MCl3(s) Delta H=???
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What is a good solvent for crystallization of an impure solid compund, talk about solubility at different temperatures in general, not specific compounds.
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Magnesium carbonate (MgCO3) and calcium carbonate (CaCO3) both decompose when heated, forming CO2 gas and the corresponding oxides.
MgCO3(s) → CO2(g) + MgO(s)
CaCO3(s) → CO2(g) + CaO(s)
When a particular mixture of MgCO3 and CaCO3 is heated, it releases 47% of its mass as CO2, so that the oxide products have 53%of the mass of the original sample. What mass percentage of MgCO3 was present in the original mixture? (HINT: The fact that the sample loses 47% of its mass does not depend on the original sample size, only on the relative amounts of the two carbonates. So you can start with any size sample you’d like.)
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Anyone know the answer to this question???
Given the following reaction at equilibrium at 450.0
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Cyclopentane adopts two puckered conformations, as well as a planar conformation. Name the two puckered forms and explain why they are lower in energy than the planar form of cyclopentane.
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