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Based on the notion of weak and strong acids and bases, which of the following three actions would you expect to produce the largest ( most negative) ΔHneut. the smallest ΔHneut?
1. HCl + NaOh--> Nacl+ NaOh
2. Nh4OH+ HC2H3O2 --> Nah4Ch3CO2 + H2O
3. NH4OH + HNO3 --> NH4NO3 + H2O
What mass of sucrose C 12 H 22 O 11 must be mixed with 543 grams of H 2 O to make a solution with an osmotic pressure =8.00 atm at the temperature of 12 degree celsius?
A sample of unknown hydrate of FeCl3 weighs 8.693g. After heating the sample to constant mass, the remaining anhydrous salt weighs 5.216g. What is the experimental formula for the hydrate
Why are the Kr---Kr and intermolecular Br---Br distances in the solid form of the two elements practically identical. How would you expect the Br---Br distances in solid CBr4 to be related to the above distances
Which term or terms could be used to describe this sample of gold? Check all that apply. mixture heterogeneous mixture homogenous mixture solution pure chemical substance compound element
vitamin c l-ascorbic acid mw 176.0 gmol is a weak acid pka 4.863. suppose a 500.0 mg tablet is dissolved in water and
calcualte the pH at one-half the equivalence pont and at the equivalence point for a titration of 50 mL of 0.100M acetic acid with 0.100M NaOH
The Dumas method is used to analyze an unknown substance. 0.500 g of liquid was place in the 800.0 mL bulb. When heated to 68.7 C, the liquid vaporized, and the pressure was measured to be 154.5 mmHg.
How many kilograms of CaH2 are needed to fill a 134 L tank with compressed H2 gas at 154 atm pressure and 22 degrees celsius?
given that the molar enthalpy of vaporization delta h for H2O(l) is 44kj at 298k, what is the standerd enthalpy change for the reaction 2H20(G)+ O2(g)---->2H2O(G)?
When the valve between the 2.00-L bulb, in which the gas pressure is 2.00 atm, and the 3.00-L bulb, in which the gas pressure is 4.50 atm, is opened, what will be the final pressure in the two bulbs?
The stratospheric ozone layer helps to protect us from harmful ultraviolet radiation. It does so by absorbing ultraviolet light and falling apart into an molecule and an oxygen atom, a process known as photodissociation.
How many moles of HNO3 are present in 35.0 mL of a 4.50 M solution of nitric acid?
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