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state whether the equilibrium mixture contains mostly products or reaction and why. HNO2(aq) + HS(aq) ---->(double arrow) H2S(g) + NOs(aq) and Cl(aq)+ H2O(l) ---->(double arrow) OH(aq) + HCl(aq)
water for the temperature of the trapped gas, will the calculated mass percent of metal in the sample be greater than, less than, or equal to real mass percent?
Determine the total number of valence electrons in each of the following: a) COCl2; b) N2O; c) ClO2^-; d) SeCl2; e) PBr3
find the of X-281, you prepare a 0.075 test solution of X-281. The pH of the solution is determined to be 3.00. What is the of X-281?
calculate the concentration of sodium formate that must be present in a 0.10 M solution of formic acid to produce a buffer with a pH of 3.80
A 25.5g aluminum block is warmed to 65.3 degC and plunged into an insulated beaker containing 55.0g water initially at 22.3 degreeC. The aluminum and the water are allowed to come to thermal equilibrium.
A mixture of MgCO3 and MgCO3·3H2O has a mass of 3.057 g. After heating to drive off all the water the mass is 2.790 g. What is the mass percent of MgCO3·3H2O in the mixture.
Calculate the expansion work done against a constant external pressure of 0.999 atm and at a constant temperature of 24°C. Assume that the initial volume of dry ice is negligible and that CO2 behaves like an ideal gas.
A two-component mixture of volatile liquids was separated by gas chromatography using a 15 meter capillary column. The separation was insufficient with this column to see resolution of both fractions.
If every tablet in the problem abouveweights 650 mg. How many kilograms of excipient (lactose/talcum powder/filler) are needed to complete the whole batch?
What is the percent ionization of a 0.177 M solution of this acid?
When distilling a pure compound, the boiling temperature remains constant although you are heating the flask. Why?
Can the five percent approximation be applied in determining the pH of the following solutions? Yes No 8.07×10-3 M dihydrogen citrate ion Yes No 7.51×10-5 M chlorous acid Yes No 4.38×10-2 M carbonic acid Yes No 1.44×10-2 M hydrocyanic acid
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