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What mass of ethylene glycol must be added to 1455 g of water to raise the boiling point to 104.7 degree Celsius ?
The enthalpy of combustion of benzoic acid (C6H5COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be 3226.7 kj
A gaseous mixture of O_2 and N_2 contains 40.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 325 mmHg?
If the solution has the same density and specific heat as water, what is ?H for this reaction (per mole of H2O produced)? Assume that the total volume is the sum of the individual volumes.
Write the net ionic equations for the reactions.
Stack the subshells in order of energy, with the lowest-energy subshell at the bottom and the highest-energy subshell at the top.
How many liters of CH4 (g), measured at 23.4C and 768mmHG, must be burned to provide the heat needed to vaporize 3.78 L of water at 100C? DeltaHcomb= -8.90x10^2 KJ mol CH4. For H2)(l) at 100 C, d= 0.958 g cm and deltaHvap=40.7KJ mol.
Calculate the pH during the titration of 25.9 mL of 0.618 M ammonia NH3 with 0.205 M HCl after 11.5 mL of the acid have been added. Kb of ammonia = 1.8 x 10-5.
Find the pH and volume (mL) of 0.447 M HNO3 needed to reach the equivalence point(s) in titrations of each of the following
What is the molarity of the resulting solution when 28.249 g of Mn(ClO4)2 · 6 H2O are added to 550.0 mL of water?
At 8:00 a.m., a patient receives a 58-mg dose of I -131 to obtain an image of her thyroid. If the nuclide has a half-life of 8 days, what mass of the nuclide remains in the patient at 5:00 p.m.
Use bond enthalpy to estimate the enthalpy change for each of the following reactions: (a)H2C=O(g) + HCl(g) ---> H3C¬O¬Cl(g (b)H202(g)+2CO(g)
How much PPP do you need to make 500ml of the solution if you only have 25g and you know that the MW of PPP is 478 g/mole.
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