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How many grams of sodium formate, NaCHO2, would have to be dissolved in 1.3 L of 0.45 M formic acid (pKa 3.74) to make the solution a buffer for pH 3.75
Draw and name all the possible constitutional and stereoisomers of the monochlorinated products formed by the free-radical chlorination of 2-methylbutane. Count any pair of enantiomers as two differ
The enthalpy change for the oxidation of styrene, C8H8, is measured by calorimetry. C8H8(l) + 10O2(g) ? 8CO2(g) + 4HOH(l) ?rH = -4395.0 kJ/mol How much heat in kJ is required to oxidize 25.0 g of st
How much energy (in J) is required to change the temperature of 1.00 kg Fe from 25.0°C to 1515°C? The specific heat capacity of iron is 0.449 J/g*°C.
Oxygen gas can be obtained by the thermal decomposition of mercuric oxide; 2 HgO(s) + heat ® 2 Hg(l) + O2(g) What volume in liters of oxygen gas, measured at 6.926 °C and 0.9130 atm, would b
The triprotic acid H3A has ionization constants of Ka1 = 7.5× 10-2, Ka2 = 7.8× 10-9, and Ka3 = 6.9× 10-12. Calculate the following values for a 0.0580 M solution of NaH2A Calculate
What is the molar mass of butane, C4H10? Express your answer to four significant figures and include the appropriate units. Value and units
Given: Volume of He sample = 72.5mL Temperature = 30 C Atmospheric pressure = 785 mmHg Equilibrium vapor pressure of water at 30 C = 31.88 mmHg What is the ratio of average molecular velocity betwee
The sodium emission intensity from the diluted sample is 0.092. The calibration curve for sodium is INa = 0.083 L.mg-1 [Na] + 0.001. What is the concentration of Na in the diluted carrot solution? W
The mass of a beaker is 123.2537 g. After carrots were added to the beaker, its mass is 128.2671 g. The sample was then placed in the oven to remove water.
What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA-, A2-) at pH 6.26
How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 30.6 moles of water vapor? Express your answer with the appropriate units.
What concentrations of acetic acid (pKa = 4.76) and acetate would be required to prepare a 0.10 M buffer solution at pH 5.0. Enter your answer to two significant figures.
What mass of carbon dioxide was produced? Express your answer to three significant figures and include the appropriate units.
Calculate the pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in dimethylamine (aq) and 0.100 M in dimethylamine hydrochloride (aq). Use the pKa given in
How many moles of nitrogen, N, are in 65.0 g of nitrous oxide,N2O ? Express your answer with the appropriate units.
Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: \rm 2Al}+3Cl_2rightarrow2AlCl_3 What is the maximum mass of aluminum chloride that can be formed when reacting
What is the mass of 3.20 moles of magnesium chloride,MgCl2 ? Express your answer with the appropriate units. mass of MgCl2 =
what the information about newly discovered virus that we should know before we could devolope an effective drug therapy
Using bond enthalpies, estimate the heat of the gas phase reaction of methane with bromine to form methyl bromine and hydrogen bromine.
What are the formal charges on all of the atoms in question 7. How many resonance structures are there
Suppose a piece of silver jewelry contains 6.53×1022 atoms of silver (Ag). How many dozens of silver atoms are in the piece of jewelry. Express your answer numerically in dozens.
If the entropy of a collection of a molecules in 50,000 boxes is 3.73 x 10^-20 J/K, how many molecules are there
Given that the bond length of HBr is 1.41 A, estimate the dipole moment of this molecule by assuming a charge of 1+ on H and 1- on Br.
Draw the structure resulting from a reaction of osmium tetroxide (OsO4) and hydrogen peroxide (H2O2) with the following alkene. If one stereogenic center is formed, draw a single specific enantiomer