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A 6.881 g sample containing magnesium chloride and sodium chloride was dissolved in sufficient water to give 500 mL of solution. Analysis of the chloride content of 50.0 mL aliquot resulted in the formation of 0.5923 g of AgCl. The magnesium in the second 50.0 mL aliquot was precipitated as MgNH4PO4; on ignition, 0.1796 g of Mg2P2O7 was found. Calculate the percentage of MgCl2.6H2O and of NaCl in the sample
arrange the following compounds (h2o h2s br2 nacl) in increasing boiling points, melting points, surface tension, vapor pressure, viscosity
Given the unbalanced equation:
Al(s) + O2 (g) Al2O3 (s)
atomic mass: Al (26.98); O (16.00)
a. How many mole of Al and O2
are needed to produce 10 moles of Al2O3
?
b. How many moles of Al2O3 will be produced if 25mol of Al react in a stream of oxygen gas?
c. How many moles of O2
are needed to react completely with 5 mole of Al?
d. How many moles of Al are needed to react completely with 52.00 g O2
?
e. How many grams of Al2O3
are produced if 2 moles of oxygen gas react with 3 moles of Al?
f. How many moles of O2
are needed to produce 158.00 g Al2O3
?
g. How many grams of O2
are needed to react with 10.00g Al?
Calculate K for the reaction :
2A + B <----> C + D
If at equilibrium, A = 0.4 mols/liter, mols/liter, B = 0.5 mols per liter. C = 0.3 mols per liter, and D = 0.8 mols per liter.
What types of element are involved in ionic bonding
Calculate the hydroxide ion concentration at 25 in a solution whose pH is 5.78. (kW=1*10_14moldm at25)
1. The vapor pressure of pure water at 110oC is 1070 torr. A solution of ethylene glycol and water has a vapor pressure of 1.10 atm at the same temperature. What is the mole fraction of ethylene glycol in the solution?
A 24-hr urine specimen was diluted to 2.000 L. After the solution was buffered to pH 10, a 10.00-mL aliquot was titrated with 23.57 mL of 0.004590 M EDTA. The calcium in a second 10.00-mL aliquot was isolated as CaC2O4(s), redissolved in acid, and titrated with 10.53 mL of the EDTA solution. Assuming that 15 to 300 mg of magnesium and 50 to 400 mg of calcium per day are normal, did this specimen fall within these ranges?
using the decomposition reaction of copper carbonate basic calculate the mass of H2O produced at STP
how could you distinguish octanol from 1-octane by a simple chemical test?
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