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A gas sample has an original volume of 680 ml when collected at 720 mm and 28°C. What will be the volume of the gas sample if the pressure increases to 820 mm and the temperature increases to 55
How many moles of NH4NO2 would be required to form 25 grams of N2 in the following reaction
How many grams of SO2 would be formed from 60 grams of FeS2 in the following reaction
How many moles of Fe would be formed from 50 grams of Fe3O4 in the following equation
How many grams of NaCl would be formed from 100 grams of Na2CO3 in the following reaction? Na2CO3 + 2 HCl ? 2 NaCl + CO2 + H2O
How many PopTarts® are needed to convert 1,000.0 g of water at 20.0 oC to steam at 100.0 oC? One PopTart is equal to 800,000 J of energy
Which of the following has the lowest value of absolute entropy per mole? Conditions are as defined in each case.
Calculate the amount of heat evolved in the oxidation of 32.0 g of Fe (Ar = 55.85 g/mol) at 25 oC and 1 atm pressure ( ?Hfo(Fe2O 3,s) = -824kJ/mol)
The concentration of sulfuric acid in the lead-storage battery of an automobile over a period of time has decreased from 38.0 percent by mass (density = 1.29 g/mL) to 26.0 percent by mass (1.19 g/mL
A constant electric current flows for 3.75 h through two electrolytic cells connected in series. One contains a solution of AgNO3 and the second a solution of CuCl2. During this time 1.50 g of silve
Draw the full and complete mechanism for the reduction of a carboxylic acid using H2 over platinum. The product is a primary alcohol. Just use ethanoic acid as your model compound.
What is the enthalpy of this reaction. Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water.
Calculate the enthalpy change, Delta H, for this reaction per mole of \rm X. Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 \rm J/(g \cdot {^\c
Assume that the volume remains constant when the base is added. my pKa is 4.34, mol HA is 0.302, my concentration ratio is 0.51, but how do I get moles of strong base initially added
What is the freezing point of this solution? The Kf for water is 1.86 C/m and the density of ethylese glycol is 1.1135 g/mL. Consider if the solute is an electrolyte or a non electrolyte.
At 50°C the vapor pressure of ethanol is 0.30 atm, acetic acid is 0.08 atm, water is 0.12 atm, and acetone is 0.84 atm. A) Arrange these substances in order of increasing rates of evaporation.
how much of the CaCl2 can be prepared from 385g of an ore containing Ca(OH)2 if the ore is 78.4% Ca(OH)2 by mass? Use the equation: 2 NH4Cl + 1 Ca(OH)2 --> 2 HN3 + 1 CaCl2 + 2 H20
The total molarity of acid and conjugate base in this buffer is 0.100 M . A student adds 5.90 mL of a 0.380 M HCl solution to the beaker. How much will the pH change. The pKa of acetic acid is 4.760
the osmotic pressure generated was 6.65atm at 298K. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound.
Rank the following carbonyl-containing compounds in order of reactivity towards nucleophilic attack.
Identify the group of elements that corresponds to each of the following generalized electron configurations and indicate the number of unpaired electrons for each
Write the condensed electron configurations for the following atoms and indicate how many unpaired electrons each has (a)mg (b)ge (c)br (d)v (e)y (f)lu
What is the correct balanced net ionic equation which represents the metathesis reaction between sodium sulfide and aluminum chloride
Carboxylic acids can be made by the hydrolysis of nitriles, which in turn can be made from an alkyl halide. Draw the structures of a starting alkyl bromide and the intermediate nitrile that would be
An aqueous KNO3 solution is made by using 84.6g of KNO3 diluted to a total solution volume of 1.43 L. Calculate the molality and mass percent of solution. Assume a density f 1.05g/mL or the solution