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The melting point range is measure for two materials (A and B). For material A, the melting point range is from 58.5 C to 64.0 C whereas for material B, the melting point range is from 87.0 C to 89.0 C. Which material, A or B, is more pure?
Why do ldehydes and ketones have lower boiling points than alcohols with similar molar mass?? Why are they higher than alkanes
Calculate the mass of carbon dioxide released when 255 g of copper carbonate [molar mass = 123.5 g/mol] is heated (assuming that the reaction goes to completion). The molar mass of CO2 is 44.0 g/mol.
For the synthesis of ammonia given below, calculate the free energy change, delta G, from the elements under standard conditions at 25 degrees celcius. N2 (g) + H2(g) -> NH3(g)
How many grams of ammonium sulfate can be produced if 30.0 mol of H2SO4 react with excess NH3 according to the equation 2NH3(aq) + H2SO4(aq) => (NH4)2SO4(aq).
A 782 mL gas sample at STP is compressed to a volume of 131 mL, and the temperature is increased to 22 ? C. What is the new pressure of the gas in Pa? Answer in units of Pa
what is the lewis dot structure of ClO3- add formal charges to the atoms remember that the formal charges will add up to the ion charge
What hybrid orbital would be expected for the central atom in each of the following: Draw the molecular structure of these compounds and label Ï? and Ï?bonds.
Calculate the equilibrium constant for this overall reaction: CH3COOH(aq) + IO^-(aq) CH3COO^-(aq) + HIO(aq) K=
A helium balloon is filled with a volume of 1.5L and has a pressure of 2.5 atm at 50oC. If it is then heated to 150oC, what will the resulting pressure be if the resulting volume is 1.6 L.
A bottle contains 225mL of insulin at a concentration of 40.0mg/mL . What is the total mass of insulin in the bottle?
How many milliliters of a 15.0% by mass solution KOH(aq) (d=1.14g/mL) are required to produce 26.0L of a solution with pH=11.50? express answer using 2 significant figures.
In an experiment 2.830 g of magnesium is reacted with 2.776 g of oxygen gas according to the equation: Mg + O2 ==> MgO. A. What is the limiting reactant. What mass of the other reactant is in exess
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